)]}' { "log": [ { "commit": "be44562613851235d801d41d5b3976dc4333f622", "tree": "ed68df6a444cd106b04f96645c03a6f97fcc2e0c", "parents": [ "86a3db5643c7d29bb36ca85c7a4bb67ad4d88d77" ], "author": { "name": "Li Zefan", "email": "lizefan@huawei.com", "time": "Thu Jan 24 14:31:42 2013 +0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Thu Jan 24 12:05:18 2013 -0800" }, "message": "cgroup: remove synchronize_rcu() from cgroup_diput()\n\nFree cgroup via call_rcu(). The actual work is done through\nworkqueue.\n\nSigned-off-by: Li Zefan \u003clizefan@huawei.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "12a9d2fef1d35770d3cdc2cd1faabb83c45bc0fa", "tree": "a7c50e81a638a156ce8d4f41dcab273397e6e474", "parents": [ "d5b1fe68baa7213f198e5be8cd1a1037258ab2c8" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Jan 07 08:49:33 2013 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Jan 07 08:50:28 2013 -0800" }, "message": "cgroup: implement cgroup_rightmost_descendant()\n\nImplement cgroup_rightmost_descendant() which returns the right most\ndescendant of the specified cgroup. This can be used to skip the\ncgroup\u0027s subtree while iterating with\ncgroup_for_each_descendant_pre().\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "d5b1fe68baa7213f198e5be8cd1a1037258ab2c8", "tree": "83d5c15ee51d1b782904f0b238c584f16d17bdec", "parents": [ "d1c3ed669a2d452cacfb48c2d171a1f364dae2ed" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Dec 28 13:18:28 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Jan 07 08:49:16 2013 -0800" }, "message": "cgroup: remove unused dummy cgroup_fork_callbacks()\n\n5edee61ede (\"cgroup: cgroup_subsys-\u003efork() should be called after the\ntask is added to css_set\") removed cgroup_fork_callbacks() but forgot\nto remove its dummy version for !CONFIG_CGROUPS. Remove it.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReported-by: Herton Ronaldo Krzesinski \u003cherton.krzesinski@canonical.com\u003e\n" }, { "commit": "d0b2fdd2a51203f04ea0a5d716e033c15e0231af", "tree": "778d37a6aa21db18b7416309a5cbd1d664e9c6e0", "parents": [ "0a950f65e1e64f4e82b4b5507773848ea88bcb8e" ], "author": { "name": "Tao Ma", "email": "boyu.mt@taobao.com", "time": "Tue Nov 20 22:06:18 2012 +0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Nov 20 06:44:58 2012 -0800" }, "message": "cgroup: remove obsolete guarantee from cgroup_task_migrate.\n\n\u0027guarantee\u0027 is already removed from cgroup_task_migrate, so remove\nthe corresponding comments. Some other typos in cgroup are also\nchanged.\n\nCc: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Li Zefan \u003clizefan@huawei.com\u003e\nSigned-off-by: Tao Ma \u003cboyu.mt@taobao.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "0a950f65e1e64f4e82b4b5507773848ea88bcb8e", "tree": "90106ea13abc3cfe9226dc0c7628ccad136f92b4", "parents": [ "033fa1c5f5f73833598a0beb022c0048fb769dad" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 09:02:12 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 09:02:12 2012 -0800" }, "message": "cgroup: add cgroup-\u003eid\n\nWith the introduction of generic cgroup hierarchy iterators, css_id is\nbeing phased out. It was unnecessarily complex, id\u0027ing the wrong\nthing (cgroups need IDs, not CSSes) and has other oddities like not\nbeing available at -\u003ecss_alloc().\n\nThis patch adds cgroup-\u003eid, which is a simple per-hierarchy\nida-allocated ID which is assigned before -\u003ecss_alloc() and released\nafter -\u003ecss_free().\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nAcked-by: Neil Horman \u003cnhorman@tuxdriver.com\u003e\n" }, { "commit": "033fa1c5f5f73833598a0beb022c0048fb769dad", "tree": "ec6c34da43d3d71ec3dbfc116ae1c3b8197edc89", "parents": [ "2260e7fc1f18ad815324605c1ce7d5c6fd9b19a2" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:39 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:39 2012 -0800" }, "message": "cgroup, cpuset: remove cgroup_subsys-\u003epost_clone()\n\nCurrently CGRP_CPUSET_CLONE_CHILDREN triggers -\u003epost_clone(). Now\nthat clone_children is cpuset specific, there\u0027s no reason to have this\nrather odd option activation mechanism in cgroup core. cpuset can\ncheck the flag from its -\u003ecss_allocate() and take the necessary\naction.\n\nMove cpuset_post_clone() logic to the end of cpuset_css_alloc() and\nremove cgroup_subsys-\u003epost_clone().\n\nLoosely based on Glauber\u0027s \"generalize post_clone into post_create\"\npatch.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nOriginal-patch-by: Glauber Costa \u003cglommer@parallels.com\u003e\nOriginal-patch: \u003c1351686554-22592-2-git-send-email-glommer@parallels.com\u003e\nAcked-by: Serge E. Hallyn \u003cserge.hallyn@ubuntu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\n" }, { "commit": "2260e7fc1f18ad815324605c1ce7d5c6fd9b19a2", "tree": "effa76704caa7a6ce40b19de3fa2c3367ac5b431", "parents": [ "92fb97487a7e41b222c1417cabd1d1ab7cc3a48c" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:38 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:38 2012 -0800" }, "message": "cgroup: s/CGRP_CLONE_CHILDREN/CGRP_CPUSET_CLONE_CHILDREN/\n\nclone_children is only meaningful for cpuset and will stay that way.\nRename the flag to reflect that and update documentation. Also, drop\nclone_children() wrapper in cgroup.c. The thin wrapper is used only a\nfew times and one of them will go away soon.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Serge E. Hallyn \u003cserge.hallyn@ubuntu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\n" }, { "commit": "92fb97487a7e41b222c1417cabd1d1ab7cc3a48c", "tree": "c220c622b9ac9b16535535d448e9cd29be72c77e", "parents": [ "b1929db42f8a649d9a9e397119f628c27fd4021f" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:38 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:38 2012 -0800" }, "message": "cgroup: rename -\u003ecreate/post_create/pre_destroy/destroy() to -\u003ecss_alloc/online/offline/free()\n\nRename cgroup_subsys css lifetime related callbacks to better describe\nwhat their roles are. Also, update documentation.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "b1929db42f8a649d9a9e397119f628c27fd4021f", "tree": "04c0fa6f056395f8d17b5cd918403547be3f1425", "parents": [ "4b8b47eb0001a89f271d671d959b235faa8f03e2" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:38 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:38 2012 -0800" }, "message": "cgroup: allow -\u003epost_create() to fail\n\nThere could be cases where controllers want to do initialization\noperations which may fail from -\u003epost_create(). This patch makes\n-\u003epost_create() return -errno to indicate failure and online_css()\nrelay such failures.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\n" }, { "commit": "a31f2d3ff7fe20cbe2a143515a7d7c408b29dd0d", "tree": "fd9e909ad92609eb189d406c4812325788d25bbc", "parents": [ "42809dd4225b2f3127a4804314a1b33608620d96" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:37 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:37 2012 -0800" }, "message": "cgroup: introduce CSS_ONLINE flag and on/offline_css() helpers\n\nNew helpers on/offline_css() respectively wrap -\u003epost_create() and\n-\u003epre_destroy() invocations. online_css() sets CSS_ONLINE after\n-\u003epost_create() is complete and offline_css() invokes -\u003epre_destroy()\niff CSS_ONLINE is set and clears it while also handling the temporary\ndropping of cgroup_mutex.\n\nThis patch doesn\u0027t introduce any behavior change at the moment but\nwill be used to improve cgroup_create() failure path and allow\n-\u003epost_create() to fail.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "38b53abaa3e0c7e750ef73eee919cf42eee6b134", "tree": "1692ce65068d5df48768564548ec7e4ed4b67da5", "parents": [ "febfcef60d4f9457785b45aab548bc7ee5ea158f" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:36 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:36 2012 -0800" }, "message": "cgroup: make CSS_* flags bit masks instead of bit positions\n\nCurrently, CSS_* flags are defined as bit positions and manipulated\nusing atomic bitops. There\u0027s no reason to use atomic bitops for them\nand bit positions are clunkier to deal with than bit masks. Make\nCSS_* bit masks instead and use the usual C bitwise operators to\naccess them.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "febfcef60d4f9457785b45aab548bc7ee5ea158f", "tree": "70fab0e8ec07aec4142f1dc228f307e6b1d79de0", "parents": [ "4e139afc22cb98d0d032ffce0285bfcc73ca5217" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:36 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 19 08:13:36 2012 -0800" }, "message": "cgroup: cgroup-\u003edentry isn\u0027t a RCU pointer\n\ncgroup-\u003edentry is marked and used as a RCU pointer; however, it isn\u0027t\none - the final dentry put doesn\u0027t go through call_rcu(). cgroup and\ndentry share the same RCU freeing rule via synchronize_rcu() in\ncgroup_diput() (kfree_rcu() used on cgrp is unnecessary). If cgrp is\naccessible under RCU read lock, so is its dentry and dereferencing\ncgrp-\u003edentry doesn\u0027t need any further RCU protection or annotation.\n\nWhile not being accurate, before the previous patch, the RCU accessors\nserved a purpose as memory barriers - cgroup-\u003edentry used to be\nassigned after the cgroup was made visible to cgroup_path(), so the\nassignment and dereferencing in cgroup_path() needed the memory\nbarrier pair. Now that list_add_tail_rcu() happens after\ncgroup-\u003edentry is assigned, this no longer is necessary.\n\nRemove the now unnecessary and misleading RCU annotations from\ncgroup-\u003edentry. To make up for the removal of rcu_dereference_check()\nin cgroup_path(), add an explicit rcu_lockdep_assert(), which asserts\nthe dereference rule of @cgrp, not cgrp-\u003edentry.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "574bd9f7c7c1d32f52dea5488018a6ff79031e22", "tree": "f43657afb59dd12fe1eca329acc6caf885507727", "parents": [ "eb6fd5040ee799009173daa49c3e7aa0362167c9" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 09 09:12:29 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 09 09:12:29 2012 -0800" }, "message": "cgroup: implement generic child / descendant walk macros\n\nCurrently, cgroup doesn\u0027t provide any generic helper for walking a\ngiven cgroup\u0027s children or descendants. This patch adds the following\nthree macros.\n\n* cgroup_for_each_child() - walk immediate children of a cgroup.\n\n* cgroup_for_each_descendant_pre() - visit all descendants of a cgroup\n in pre-order tree traversal.\n\n* cgroup_for_each_descendant_post() - visit all descendants of a\n cgroup in post-order tree traversal.\n\nAll three only require the user to hold RCU read lock during\ntraversal. Verifying that each iterated cgroup is online is the\nresponsibility of the user. When used with proper synchronization,\ncgroup_for_each_descendant_pre() can be used to propagate state\nupdates to descendants in reliable way. See comments for details.\n\nv2: s/config/state/ in commit message and comments per Michal. More\n documentation on synchronization rules.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujisu.com\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "eb6fd5040ee799009173daa49c3e7aa0362167c9", "tree": "16d837a4479b25d379b558d850431fb3b7291dd1", "parents": [ "a8638030f668884720b8f4456448d0ce33952b05" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 09 09:12:29 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 09 09:12:29 2012 -0800" }, "message": "cgroup: use rculist ops for cgroup-\u003echildren\n\nUse RCU safe list operations for cgroup-\u003echildren. This will be used\nto implement cgroup children / descendant walking which can be used by\ncontrollers.\n\nNote that cgroup_create() now puts a new cgroup at the end of the\n-\u003echildren list instead of head. This isn\u0027t strictly necessary but is\ndone so that the iteration order is more conventional.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "a8638030f668884720b8f4456448d0ce33952b05", "tree": "2532b2ef9def879513fad0e304a6a9c98fa798f0", "parents": [ "316eb661f125397d46f16f94e3c81ad3dc4c1233" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 09 09:12:29 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Nov 09 09:12:29 2012 -0800" }, "message": "cgroup: add cgroup_subsys-\u003epost_create()\n\nCurrently, there\u0027s no way for a controller to find out whether a new\ncgroup finished all -\u003ecreate() allocatinos successfully and is\nconsidered \"live\" by cgroup.\n\nThis becomes a problem later when we add generic descendants walking\nto cgroup which can be used by controllers as controllers don\u0027t have a\nsynchronization point where it can synchronize against new cgroups\nappearing in such walks.\n\nThis patch adds -\u003epost_create(). It\u0027s called after all -\u003ecreate()\nsucceeded and the cgroup is linked into the generic cgroup hierarchy.\nThis plays the counterpart of -\u003epre_destroy().\n\nWhen used in combination with the to-be-added generic descendant\niterators, -\u003epost_create() can be used to implement reliable state\ninheritance. It will be explained with the descendant iterators.\n\nv2: Added a paragraph about its future use w/ descendant iterators per\n Michal.\n\nv3: Forgot to add -\u003epost_create() invocation to cgroup_load_subsys().\n Fixed.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\n" }, { "commit": "1db1e31b1ee3ae126ef98f39083b5f213c7b41bf", "tree": "98328124d3b8b08b6db894c79d0e79b3a42417bf", "parents": [ "5d8f72b55c275677865de670fa147ed318191d81", "bcf6de1b9129531215d26dd9af8331e84973bc52" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:21:51 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:21:51 2012 -0800" }, "message": "Merge branch \u0027cgroup-rmdir-updates\u0027 into cgroup/for-3.8\n\nPull rmdir updates into for-3.8 so that further callback updates can\nbe put on top. This pull created a trivial conflict between the\nfollowing two commits.\n\n 8c7f6edbda (\"cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them\")\n ed95779340 (\"cgroup: kill cgroup_subsys-\u003e__DEPRECATED_clear_css_refs\")\n\nThe former added a field to cgroup_subsys and the latter removed one\nfrom it. They happen to be colocated causing the conflict. Keeping\nwhat\u0027s added and removing what\u0027s removed resolves the conflict.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "bcf6de1b9129531215d26dd9af8331e84973bc52", "tree": "0666760423e4579a50a7752568036a13e0cfa9d5", "parents": [ "9d093cb10eb482adfba6ddc71a0969b78823ee8b" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:59 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:59 2012 -0800" }, "message": "cgroup: make -\u003epre_destroy() return void\n\nAll -\u003epre_destory() implementations return 0 now, which is the only\nallowed return value. Make it return void.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: Vivek Goyal \u003cvgoyal@redhat.com\u003e\n" }, { "commit": "b25ed609d0eecf077db607e88ea70bae83b6adb2", "tree": "ba6d9f2b6d1f0a389acb5a52cd4498c0f5ee6060", "parents": [ "1a90dd508b0b00e382fd61a46f55dc889ac21b39" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:59 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:59 2012 -0800" }, "message": "cgroup: remove CGRP_WAIT_ON_RMDIR, cgroup_exclude_rmdir() and cgroup_release_and_wakeup_rmdir()\n\nCGRP_WAIT_ON_RMDIR is another kludge which was added to make cgroup\ndestruction rollback somewhat working. cgroup_rmdir() used to drain\nCSS references and CGRP_WAIT_ON_RMDIR and the associated waitqueue and\nhelpers were used to allow the task performing rmdir to wait for the\nnext relevant event.\n\nUnfortunately, the wait is visible to controllers too and the\nmechanism got exposed to memcg by 887032670d (\"cgroup avoid permanent\nsleep at rmdir\").\n\nNow that the draining and retries are gone, CGRP_WAIT_ON_RMDIR is\nunnecessary. Remove it and all the mechanisms supporting it. Note\nthat memcontrol.c changes are essentially revert of 887032670d\n(\"cgroup avoid permanent sleep at rmdir\").\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\n" }, { "commit": "e93160803ffda2e67d9ff9cacb63bb6868c8398f", "tree": "e3305bb56336c32862f1970882f030caca7f11b2", "parents": [ "ed95779340b50e362245c81b5dec0d11a1debfa8" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:58 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:58 2012 -0800" }, "message": "cgroup: kill CSS_REMOVED\n\nCSS_REMOVED is one of the several contortions which were necessary to\nsupport css reference draining on cgroup removal. All css-\u003erefcnts\nwhich need draining should be deactivated and verified to equal zero\natomically w.r.t. css_tryget(). If any one isn\u0027t zero, all refcnts\nneeded to be re-activated and css_tryget() shouldn\u0027t fail in the\nprocess.\n\nThis was achieved by letting css_tryget() busy-loop until either the\nrefcnt is reactivated (failed removal attempt) or CSS_REMOVED is set\n(committing to removal).\n\nNow that css refcnt draining is no longer used, there\u0027s no need for\natomic rollback mechanism. css_tryget() simply can look at the\nreference count and fail if it\u0027s deactivated - it\u0027s never getting\nre-activated.\n\nThis patch removes CSS_REMOVED and updates __css_tryget() to fail if\nthe refcnt is deactivated. As deactivation and removal are a single\nstep now, they no longer need to be protected against css_tryget()\nhappening from irq context. Remove local_irq_disable/enable() from\ncgroup_rmdir().\n\nNote that this removes css_is_removed() whose only user is VM_BUG_ON()\nin memcontrol.c. We can replace it with a check on the refcnt but\ngiven that the only use case is a debug assert, I think it\u0027s better to\nsimply unexport it.\n\nv2: Comment updated and explanation on local_irq_disable/enable()\n added per Michal Hocko.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\n" }, { "commit": "ed95779340b50e362245c81b5dec0d11a1debfa8", "tree": "875124b1945f62ca741a34d8171189b5c4c3378b", "parents": [ "2ef37d3fe474b218e170010a59066e19427c9847" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:58 2012 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Nov 05 09:16:58 2012 -0800" }, "message": "cgroup: kill cgroup_subsys-\u003e__DEPRECATED_clear_css_refs\n\n2ef37d3fe4 (\"memcg: Simplify mem_cgroup_force_empty_list error\nhandling\") removed the last user of __DEPRECATED_clear_css_refs. This\npatch removes __DEPRECATED_clear_css_refs and mechanisms to support\nit.\n\n* Conditionals dependent on __DEPRECATED_clear_css_refs removed.\n\n* cgroup_clear_css_refs() can no longer fail. All that needs to be\n done are deactivating refcnts, setting CSS_REMOVED and putting the\n base reference on each css. Remove cgroup_clear_css_refs() and the\n failure path, and open-code the loops into cgroup_rmdir().\n\nThis patch keeps the two for_each_subsys() loops separate while open\ncoding them. They can be merged now but there are scheduled changes\nwhich need them to be separate, so keep them separate to reduce the\namount of churn.\n\nlocal_irq_save/restore() from cgroup_clear_css_refs() are replaced\nwith local_irq_disable/enable() for simplicity. This is safe as\ncgroup_rmdir() is always called with IRQ enabled. Note that this IRQ\nswitching is necessary to ensure that css_tryget() isn\u0027t called from\nIRQ context on the same CPU while lower context is between CSS\ndeactivation and setting CSS_REMOVED as css_tryget() would hang\nforever in such cases waiting for CSS to be re-activated or\nCSS_REMOVED set. This will go away soon.\n\nv2: cgroup_call_pre_destroy() removal dropped per Michal. Commit\n message updated to explain local_irq_disable/enable() conversion.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "5edee61edeaaebafe584f8fb7074c1ef4658596b", "tree": "23e6ee3581eb0009b3c2a2686c25fdba538219de", "parents": [ "ddffeb8c4d0331609ef2581d84de4d763607bd37" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Oct 16 15:03:14 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Oct 16 15:03:14 2012 -0700" }, "message": "cgroup: cgroup_subsys-\u003efork() should be called after the task is added to css_set\n\ncgroup core has a bug which violates a basic rule about event\nnotifications - when a new entity needs to be added, you add that to\nthe notification list first and then make the new entity conform to\nthe current state. If done in the reverse order, an event happening\ninbetween will be lost.\n\ncgroup_subsys-\u003efork() is invoked way before the new task is added to\nthe css_set. Currently, cgroup_freezer is the only user of -\u003efork()\nand uses it to make new tasks conform to the current state of the\nfreezer. If FROZEN state is requested while fork is in progress\nbetween cgroup_fork_callbacks() and cgroup_post_fork(), the child\ncould escape freezing - the cgroup isn\u0027t frozen when -\u003efork() is\ncalled and the freezer couldn\u0027t see the new task on the css_set.\n\nThis patch moves cgroup_subsys-\u003efork() invocation to\ncgroup_post_fork() after the new task is added to the css_set.\ncgroup_fork_callbacks() is removed.\n\nBecause now a task may be migrated during cgroup_subsys-\u003efork(),\nfreezer_fork() is updated so that it adheres to the usual RCU locking\nand the rather pointless comment on why locking can be different there\nis removed (if it doesn\u0027t make anything simpler, why even bother?).\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\nCc: stable@vger.kernel.org\n" }, { "commit": "68d47a137c3bef754923bccf73fb639c9b0bbd5e", "tree": "e82a527bd978ee96283f03d0df36f47d9aee1e41", "parents": [ "c0e8a139a5bb8add02b4111e9e1957d810d7285e", "8c7f6edbda01f1b1a2e60ad61f14fe38023e433b" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Oct 02 10:52:28 2012 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Oct 02 10:52:28 2012 -0700" }, "message": "Merge branch \u0027for-3.7-hierarchy\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup\n\nPull cgroup hierarchy update from Tejun Heo:\n \"Currently, different cgroup subsystems handle nested cgroups\n completely differently. There\u0027s no consistency among subsystems and\n the behaviors often are outright broken.\n\n People at least seem to agree that the broken hierarhcy behaviors need\n to be weeded out if any progress is gonna be made on this front and\n that the fallouts from deprecating the broken behaviors should be\n acceptable especially given that the current behaviors don\u0027t make much\n sense when nested.\n\n This patch makes cgroup emit warning messages if cgroups for\n subsystems with broken hierarchy behavior are nested to prepare for\n fixing them in the future. This was put in a separate branch because\n more related changes were expected (didn\u0027t make it this round) and the\n memory cgroup wanted to pull in this and make changes on top.\"\n\n* \u0027for-3.7-hierarchy\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:\n cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them\n" }, { "commit": "8c7f6edbda01f1b1a2e60ad61f14fe38023e433b", "tree": "f1db9712b109575cba86e37140e1e4f8a56ca780", "parents": [ "fbcbe2b3c92ee1c930dcfcf8bb764074c100fd63" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Thu Sep 13 12:20:58 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Sep 14 12:01:16 2012 -0700" }, "message": "cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them\n\nCurrently, cgroup hierarchy support is a mess. cpu related subsystems\nbehave correctly - configuration, accounting and control on a parent\nproperly cover its children. blkio and freezer completely ignore\nhierarchy and treat all cgroups as if they\u0027re directly under the root\ncgroup. Others show yet different behaviors.\n\nThese differing interpretations of cgroup hierarchy make using cgroup\nconfusing and it impossible to co-mount controllers into the same\nhierarchy and obtain sane behavior.\n\nEventually, we want full hierarchy support from all subsystems and\nprobably a unified hierarchy. Users using separate hierarchies\nexpecting completely different behaviors depending on the mounted\nsubsystem is deterimental to making any progress on this front.\n\nThis patch adds cgroup_subsys.broken_hierarchy and sets it to %true\nfor controllers which are lacking in hierarchy support. The goal of\nthis patch is two-fold.\n\n* Move users away from using hierarchy on currently non-hierarchical\n subsystems, so that implementing proper hierarchy support on those\n doesn\u0027t surprise them.\n\n* Keep track of which controllers are broken how and nudge the\n subsystems to implement proper hierarchy support.\n\nFor now, start with a single warning message. We can whine louder\nlater on.\n\nv2: Fixed a typo spotted by Michal. Warning message updated.\n\nv3: Updated memcg part so that it doesn\u0027t generate warning in the\n cases where .use_hierarchy\u003dfalse doesn\u0027t make the behavior\n different from root.use_hierarchy\u003dtrue. Fixed a typo spotted by\n Glauber.\n\nv4: Check -\u003ebroken_hierarchy after cgroup creation is complete so that\n -\u003ecreate() can affect the result per Michal. Dropped unnecessary\n memcg root handling per Michal.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nAcked-by: Serge E. Hallyn \u003cserue@us.ibm.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\nCc: Peter Zijlstra \u003cpeterz@infradead.org\u003e\nCc: Paul Turner \u003cpjt@google.com\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Thomas Graf \u003ctgraf@suug.ch\u003e\nCc: Vivek Goyal \u003cvgoyal@redhat.com\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: Ingo Molnar \u003cmingo@redhat.com\u003e\nCc: Arnaldo Carvalho de Melo \u003cacme@ghostprotocols.net\u003e\nCc: Neil Horman \u003cnhorman@tuxdriver.com\u003e\nCc: Aneesh Kumar K.V \u003caneesh.kumar@linux.vnet.ibm.com\u003e\n" }, { "commit": "a6f00298b2ceaf50b4ab00e6ee3eb0206ac72fac", "tree": "47064dd9fcb48c70b7671dbd93c12281e1022d84", "parents": [ "8a8e04df4747661daaee77e98e102d99c9e09b98" ], "author": { "name": "Daniel Wagner", "email": "daniel.wagner@bmw-carit.de", "time": "Wed Sep 12 16:12:08 2012 +0200" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Sep 14 09:57:47 2012 -0700" }, "message": "cgroup: Define CGROUP_SUBSYS_COUNT according the configuration\n\nSince we know exactly how many subsystems exists at compile time we are\nable to define CGROUP_SUBSYS_COUNT correctly. CGROUP_SUBSYS_COUNT will\nbe at max 12 (all controllers enabled). Depending on the architecture\nwe safe either 32 - 12 pointers (80 bytes) or 64 - 12 pointers (416\nbytes) per cgroup.\n\nWith this change we can also remove the temporary placeholder to avoid\ncompilation errors.\n\nSigned-off-by: Daniel Wagner \u003cdaniel.wagner@bmw-carit.de\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nAcked-by: Neil Horman \u003cnhorman@tuxdriver.com\u003e\nCc: Gao feng \u003cgaofeng@cn.fujitsu.com\u003e\nCc: Jamal Hadi Salim \u003cjhs@mojatatu.com\u003e\nCc: John Fastabend \u003cjohn.r.fastabend@intel.com\u003e\nCc: netdev@vger.kernel.org\nCc: cgroups@vger.kernel.org\n" }, { "commit": "8a8e04df4747661daaee77e98e102d99c9e09b98", "tree": "8ecd4288cfad84ed2bfc1820331b2483e70abfd3", "parents": [ "80f4c87774721e864d5a5a1f7aca3e95fd90e194" ], "author": { "name": "Daniel Wagner", "email": "daniel.wagner@bmw-carit.de", "time": "Wed Sep 12 16:12:07 2012 +0200" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Sep 14 09:57:43 2012 -0700" }, "message": "cgroup: Assign subsystem IDs during compile time\n\nWARNING: With this change it is impossible to load external built\ncontrollers anymore.\n\nIn case where CONFIG_NETPRIO_CGROUP\u003dm and CONFIG_NET_CLS_CGROUP\u003dm is\nset, corresponding subsys_id should also be a constant. Up to now,\nnet_prio_subsys_id and net_cls_subsys_id would be of the type int and\nthe value would be assigned during runtime.\n\nBy switching the macro definition IS_SUBSYS_ENABLED from IS_BUILTIN\nto IS_ENABLED, all *_subsys_id will have constant value. That means we\nneed to remove all the code which assumes a value can be assigned to\nnet_prio_subsys_id and net_cls_subsys_id.\n\nA close look is necessary on the RCU part which was introduces by\nfollowing patch:\n\n commit f845172531fb7410c7fb7780b1a6e51ee6df7d52\n Author:\tHerbert Xu \u003cherbert@gondor.apana.org.au\u003e Mon May 24 09:12:34 2010\n Committer:\tDavid S. Miller \u003cdavem@davemloft.net\u003e Mon May 24 09:12:34 2010\n\n cls_cgroup: Store classid in struct sock\n\n Tis code was added to init_cgroup_cls()\n\n\t /* We can\u0027t use rcu_assign_pointer because this is an int. */\n\t smp_wmb();\n\t net_cls_subsys_id \u003d net_cls_subsys.subsys_id;\n\n respectively to exit_cgroup_cls()\n\n\t net_cls_subsys_id \u003d -1;\n\t synchronize_rcu();\n\n and in module version of task_cls_classid()\n\n\t rcu_read_lock();\n\t id \u003d rcu_dereference(net_cls_subsys_id);\n\t if (id \u003e\u003d 0)\n\t\t classid \u003d container_of(task_subsys_state(p, id),\n\t\t\t\t\t struct cgroup_cls_state, css)-\u003eclassid;\n\t rcu_read_unlock();\n\nWithout an explicit explaination why the RCU part is needed. (The\nrcu_deference was fixed by exchanging it to rcu_derefence_index_check()\nin a later commit, but that is a minor detail.)\n\nSo here is my pondering why it was introduced and why it safe to\nremove it now. Note that this code was copied over to net_prio the\nreasoning holds for that subsystem too.\n\nThe idea behind the RCU use for net_cls_subsys_id is to make sure we\nget a valid pointer back from task_subsys_state(). task_subsys_state()\nis just blindly accessing the subsys array and returning the\npointer. Obviously, passing in -1 as id into task_subsys_state()\nreturns an invalid value (out of lower bound).\n\nSo this code makes sure that only after module is loaded and the\nsubsystem registered, the id is assigned.\n\nBefore unregistering the module all old readers must have left the\ncritical section. This is done by assigning -1 to the id and issuing a\nsynchronized_rcu(). Any new readers wont call task_subsys_state()\nanymore and therefore it is safe to unregister the subsystem.\n\nThe new code relies on the same trick, but it looks at the subsys\npointer return by task_subsys_state() (remember the id is constant\nand therefore we allways have a valid index into the subsys\narray).\n\nNo precautions need to be taken during module loading\nmodule. Eventually, all CPUs will get a valid pointer back from\ntask_subsys_state() because rebind_subsystem() which is called after\nthe module init() function will assigned subsys[net_cls_subsys_id] the\nnewly loaded module subsystem pointer.\n\nWhen the subsystem is about to be removed, rebind_subsystem() will\ncalled before the module exit() function. In this case,\nrebind_subsys() will assign subsys[net_cls_subsys_id] a NULL pointer\nand then it calls synchronize_rcu(). All old readers have left by then\nthe critical section. Any new reader wont access the subsystem\nanymore. At this point we are safe to unregister the subsystem. No\nsynchronize_rcu() call is needed.\n\nSigned-off-by: Daniel Wagner \u003cdaniel.wagner@bmw-carit.de\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nAcked-by: Neil Horman \u003cnhorman@tuxdriver.com\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@linux.vnet.ibm.com\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: Eric Dumazet \u003cedumazet@google.com\u003e\nCc: Gao feng \u003cgaofeng@cn.fujitsu.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\nCc: Herbert Xu \u003cherbert@gondor.apana.org.au\u003e\nCc: Jamal Hadi Salim \u003cjhs@mojatatu.com\u003e\nCc: John Fastabend \u003cjohn.r.fastabend@intel.com\u003e\nCc: Kamezawa Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: netdev@vger.kernel.org\nCc: cgroups@vger.kernel.org\n" }, { "commit": "5fc0b02544b3b9bd3db5a8156b5f3e7350f8e797", "tree": "9382ec0de547289cbda8f4bdb90eb65a029398eb", "parents": [ "be45c900fdc2c66baad5a7703fb8136991d88aeb" ], "author": { "name": "Daniel Wagner", "email": "daniel.wagner@bmw-carit.de", "time": "Wed Sep 12 16:12:05 2012 +0200" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Sep 14 09:57:37 2012 -0700" }, "message": "cgroup: Wrap subsystem selection macro\n\nBefore we are able to define all subsystem ids at compile time we need\na more fine grained control what gets defined when we include\ncgroup_subsys.h. For example we define the enums for the subsystems or\nto declare for struct cgroup_subsys (builtin subsystem) by including\ncgroup_subsys.h and defining SUBSYS accordingly.\n\nCurrently, the decision if a subsys is used is defined inside the\nheader by testing if CONFIG_*\u003dy is true. By moving this test outside\nof cgroup_subsys.h we are able to control it on the include level.\n\nThis is done by introducing IS_SUBSYS_ENABLED which then is defined\naccording the task, e.g. is CONFIG_*\u003dy or CONFIG_*\u003dm.\n\nSigned-off-by: Daniel Wagner \u003cdaniel.wagner@bmw-carit.de\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nAcked-by: Neil Horman \u003cnhorman@tuxdriver.com\u003e\nCc: Gao feng \u003cgaofeng@cn.fujitsu.com\u003e\nCc: Jamal Hadi Salim \u003cjhs@mojatatu.com\u003e\nCc: John Fastabend \u003cjohn.r.fastabend@intel.com\u003e\nCc: netdev@vger.kernel.org\nCc: cgroups@vger.kernel.org\n" }, { "commit": "be45c900fdc2c66baad5a7703fb8136991d88aeb", "tree": "d787ad6f2d2a762c6ec581123b7325ebd62857f1", "parents": [ "51e4e7faba786d33e5e33f8776c5027a1c8d6fb7" ], "author": { "name": "Daniel Wagner", "email": "daniel.wagner@bmw-carit.de", "time": "Thu Sep 13 09:50:55 2012 +0200" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Sep 14 09:57:32 2012 -0700" }, "message": "cgroup: Remove CGROUP_BUILTIN_SUBSYS_COUNT\n\nCGROUP_BUILTIN_SUBSYS_COUNT is used as start index or stop index when\nlooping over the subsys array looking either at the builtin or the\nmodule subsystems. Since all the builtin subsystems have an id which\nis lower then CGROUP_BUILTIN_SUBSYS_COUNT we know that any module will\nhave an id larger than CGROUP_BUILTIN_SUBSYS_COUNT. In short the ids\nare sorted.\n\nWe are about to change id assignment to happen only at compile time\nlater in this series. That means we can\u0027t rely on the above trick\nsince all ids will always be defined at compile time. Furthermore,\nordering the builtin subsystems and the module subsystems is not\nreally necessary.\n\nSo we need a different way to know which subsystem is a builtin or a\nmodule one. We can use the subsys[]-\u003emodule pointer for this. Any\nplace where we need to know if a subsys is module we just check for\nthe pointer. If it is NULL then the subsystem is a builtin one.\n\nWith this we are able to drop the CGROUP_BUILTIN_SUBSYS_COUNT\nenum. Though we need to introduce a temporary placeholder so that we\ndon\u0027t get a compilation error when only CONFIG_CGROUP is selected and\nno single controller. An empty enum definition is not valid. Later in\nthis series we are able to remove the placeholder again.\n\nAnd with this change we get a fix for this:\n\nkernel/cgroup.c: In function ‘cgroup_load_subsys’:\nkernel/cgroup.c:4326:38: warning: array subscript is below array bounds [-Warray-bounds]\n\nwhen CONFIG_CGROUP\u003dy and no built in controller was enabled.\n\nSigned-off-by: Daniel Wagner \u003cdaniel.wagner@bmw-carit.de\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\nAcked-by: Neil Horman \u003cnhorman@tuxdriver.com\u003e\nCc: Gao feng \u003cgaofeng@cn.fujitsu.com\u003e\nCc: Jamal Hadi Salim \u003cjhs@mojatatu.com\u003e\nCc: John Fastabend \u003cjohn.r.fastabend@intel.com\u003e\nCc: netdev@vger.kernel.org\nCc: cgroups@vger.kernel.org\n" }, { "commit": "03b1cde6b22f625ae832b939bc7379ec1466aec5", "tree": "0aecdc872a6ab2a00a8026e1898d4f3492cca87b", "parents": [ "13af07df9b7e49f1987cf36aa048dc6c49d0f93d" ], "author": { "name": "Aristeu Rozanski", "email": "aris@redhat.com", "time": "Thu Aug 23 16:53:30 2012 -0400" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Aug 24 15:55:33 2012 -0700" }, "message": "cgroup: add xattr support\n\nThis is one of the items in the plumber\u0027s wish list.\n\nFor use cases:\n\n\u003e\u003e What would the use case be for this?\n\u003e\n\u003e Attaching meta information to services, in an easily discoverable\n\u003e way. For example, in systemd we create one cgroup for each service, and\n\u003e could then store data like the main pid of the specific service as an\n\u003e xattr on the cgroup itself. That way we\u0027d have almost all service state\n\u003e in the cgroupfs, which would make it possible to terminate systemd and\n\u003e later restart it without losing any state information. But there\u0027s more:\n\u003e for example, some very peculiar services cannot be terminated on\n\u003e shutdown (i.e. fakeraid DM stuff) and it would be really nice if the\n\u003e services in question could just mark that on their cgroup, by setting an\n\u003e xattr. On the more desktopy side of things there are other\n\u003e possibilities: for example there are plans defining what an application\n\u003e is along the lines of a cgroup (i.e. an app being a collection of\n\u003e processes). With xattrs one could then attach an icon or human readable\n\u003e program name on the cgroup.\n\u003e\n\u003e The key idea is that this would allow attaching runtime meta information\n\u003e to cgroups and everything they model (services, apps, vms), that doesn\u0027t\n\u003e need any complex userspace infrastructure, has good access control\n\u003e (i.e. because the file system enforces that anyway, and there\u0027s the\n\u003e \"trusted.\" xattr namespace), notifications (inotify), and can easily be\n\u003e shared among applications.\n\u003e\n\u003e Lennart\n\nv7:\n- no changes\nv6:\n- remove user xattr namespace, only allow trusted and security\nv5:\n- check for capabilities before setting/removing xattrs\nv4:\n- no changes\nv3:\n- instead of config option, use mount option to enable xattr support\n\nOriginal-patch-by: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Li Zefan \u003clizefan@huawei.com\u003e\nCc: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Hugh Dickins \u003chughd@google.com\u003e\nCc: Hillf Danton \u003cdhillf@gmail.com\u003e\nCc: Lennart Poettering \u003clpoetter@redhat.com\u003e\nSigned-off-by: Li Zefan \u003clizefan@huawei.com\u003e\nSigned-off-by: Aristeu Rozanski \u003caris@redhat.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "6be96a5c905178637ec06a5d456a76b2b304fca3", "tree": "06cc22397df498c7e4dbb7195f77d1bc587295e3", "parents": [ "967db0ea65b0bf8507a7643ac8f296c4f2c0a834" ], "author": { "name": "Li Zefan", "email": "lizefan@huawei.com", "time": "Wed Jun 06 19:12:30 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Wed Jun 06 19:12:30 2012 -0700" }, "message": "cgroup: remove hierarchy_mutex\n\nIt was introduced for memcg to iterate cgroup hierarchy without\nholding cgroup_mutex, but soon after that it was replaced with\na lockless way in memcg.\n\nNo one used hierarchy_mutex since that, so remove it.\n\nSigned-off-by: Li Zefan \u003clizefan@huawei.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "86f82d561864e902c70282b6f17cf590c0f34691", "tree": "1f4021c8de07899152b00ddce36f09192ee78395", "parents": [ "cbe128e348e5994516304f94865ff90c40c1c5ae" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Apr 10 10:16:36 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Wed Apr 11 09:16:48 2012 -0700" }, "message": "cgroup: remove cgroup_subsys-\u003epopulate()\n\nWith memcg converted, cgroup_subsys-\u003epopulate() doesn\u0027t have any user\nleft. Remove it.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizefan@huawei.com\u003e\n" }, { "commit": "48ddbe194623ae089cc0576e60363f2d2e85662a", "tree": "bf9f9fc29e28b6440c64727f5e0a57a9ccd8ec5d", "parents": [ "28b4c27b8e6bb6d7ff2875281a8484f8898a87ef" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "message": "cgroup: make css-\u003erefcnt clearing on cgroup removal optional\n\nCurrently, cgroup removal tries to drain all css references. If there\nare active css references, the removal logic waits and retries\n-\u003epre_detroy() until either all refs drop to zero or removal is\ncancelled.\n\nThis semantics is unusual and adds non-trivial complexity to cgroup\ncore and IMHO is fundamentally misguided in that it couples internal\nimplementation details (references to internal data structure) with\nexternally visible operation (rmdir). To userland, this is a behavior\npeculiarity which is unnecessary and difficult to expect (css refs is\notherwise invisible from userland), and, to policy implementations,\nthis is an unnecessary restriction (e.g. blkcg wants to hold css refs\nfor caching purposes but can\u0027t as that becomes visible as rmdir hang).\n\nUnfortunately, memcg currently depends on -\u003epre_destroy() retrials and\ncgroup removal vetoing and can\u0027t be immmediately switched to the new\nbehavior. This patch introduces the new behavior of not waiting for\ncss refs to drain and maintains the old behavior for subsystems which\nhave __DEPRECATED_clear_css_refs set.\n\nOnce, memcg is updated, we can drop the code paths for the old\nbehavior as proposed in the following patch. Note that the following\npatch is incorrect in that dput work item is in cgroup and may lose\nsome of dputs when multiples css\u0027s are released back-to-back, and\n__css_put() triggers check_for_release() when refcnt reaches 0 instead\nof 1; however, it shows what part can be removed.\n\n http://thread.gmane.org/gmane.linux.kernel.containers/22559/focus\u003d75251\n\nNote that, in not-too-distant future, cgroup core will start emitting\nwarning messages for subsys which require the old behavior, so please\nget moving.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Vivek Goyal \u003cvgoyal@redhat.com\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: Michal Hocko \u003cmhocko@suse.cz\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\n" }, { "commit": "28b4c27b8e6bb6d7ff2875281a8484f8898a87ef", "tree": "8da3eefc6b98c46a4dbd0fd6e6d6dec6220382df", "parents": [ "79578621b4847afdef48d19a28d00e3b188c37e1" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "message": "cgroup: use negative bias on css-\u003erefcnt to block css_tryget()\n\nWhen a cgroup is about to be removed, cgroup_clear_css_refs() is\ncalled to check and ensure that there are no active css references.\n\nThis is currently achieved by dropping the refcnt to zero iff it has\nonly the base ref. If all css refs could be dropped to zero, ref\nclearing is successful and CSS_REMOVED is set on all css. If not, the\nbase ref is restored. While css ref is zero w/o CSS_REMOVED set, any\ncss_tryget() attempt on it busy loops so that they are atomic\nw.r.t. the whole css ref clearing.\n\nThis does work but dropping and re-instating the base ref is somewhat\nhairy and makes it difficult to add more logic to the put path as\nthere are two of them - the regular css_put() and the reversible base\nref clearing.\n\nThis patch updates css ref clearing such that blocking new\ncss_tryget() and putting the base ref are separate operations.\nCSS_DEACT_BIAS, defined as INT_MIN, is added to css-\u003erefcnt and\ncss_tryget() busy loops while refcnt is negative. After all css refs\nare deactivated, if they were all one, ref clearing succeeded and\nCSS_REMOVED is set and the base ref is put using the regular\ncss_put(); otherwise, CSS_DEACT_BIAS is subtracted from the refcnts\nand the original postive values are restored.\n\ncss_refcnt() accessor which always returns the unbiased positive\nreference counts is added and used to simplify refcnt usages. While\nat it, relocate and reformat comments in cgroup_has_css_refs().\n\nThis separates css-\u003erefcnt deactivation and putting the base ref,\nwhich enables the next patch to make ref clearing optional.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "79578621b4847afdef48d19a28d00e3b188c37e1", "tree": "d66c0ba245841eefa75a2f79e5cd8e2be09385eb", "parents": [ "05ef1d7c4a5b6d09cadd2b8e9b3c395363d1a89c" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "message": "cgroup: implement cgroup_rm_cftypes()\n\nImplement cgroup_rm_cftypes() which removes an array of cftypes from a\nsubsystem. It can be called whether the target subsys is attached or\nnot. cgroup core will remove the specified file from all existing\ncgroups.\n\nThis will be used to improve sub-subsys modularity and will be helpful\nfor unified hierarchy.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "05ef1d7c4a5b6d09cadd2b8e9b3c395363d1a89c", "tree": "c63adfca7c1d6a6858cd0cecf6f4eb83775c35d8", "parents": [ "f6ea93723d0049ae5fbbb5292cb10c51d7a80801" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:56 2012 -0700" }, "message": "cgroup: introduce struct cfent\n\nThis patch adds cfent (cgroup file entry) which is the association\nbetween a cgroup and a file. This is in-cgroup representation of\nfiles under a cgroup directory. This simplifies walking walking\ncgroup files and thus cgroup_clear_directory(), which is now\nimplemented in two parts - cgroup_rm_file() and a loop around it.\n\ncgroup_rm_file() will be used to implement cftype removal and cfent is\nscheduled to serve cgroup specific per-file data (e.g. for sysfs-like\n\"sever\" semantics).\n\nv2: - cfe was freed from cgroup_rm_file() which led to use-after-free\n if the file had openers at the time of removal. Moved to\n cgroup_diput().\n\n - cgroup_clear_directory() triggered WARN_ON_ONCE() if d_subdirs\n wasn\u0027t empty after removing all files. This triggered\n spuriously if some files were open during directory clearing.\n Removed.\n\nv3: - In cgroup_diput(), WARN_ONCE(!list_empty(\u0026cfe-\u003enode)) could be\n spuriously triggered for root cgroups because they don\u0027t go\n through cgroup_clear_directory() on unmount. Don\u0027t trigger WARN\n for root cgroups.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Glauber Costa \u003cglommer@parallels.com\u003e\n" }, { "commit": "db0416b64977cb0f382175608286cc80c7573e38", "tree": "a244be0b7e7467ed89c390997aec6b176de71140", "parents": [ "6bc103498f5fe512928496fc7802d639cc2d1d20" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:55 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:55 2012 -0700" }, "message": "cgroup: remove cgroup_add_file[s]()\n\nNo controller is using cgroup_add_files[s](). Unexport them, and\nconvert cgroup_add_files() to handle NULL entry terminated array\ninstead of taking count explicitly and continue creation on failure\nfor internal use.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "8e3f6541d45e1a002801e56a19530a90f775deba", "tree": "5342d7afce759252f5204c7e33283879cca0490d", "parents": [ "b0ca5a84fc3ad8f75bb2b7ac3dc6a77151cd3906" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:55 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:55 2012 -0700" }, "message": "cgroup: implement cgroup_add_cftypes() and friends\n\nCurrently, cgroup directories are populated by subsys-\u003epopulate()\ncallback explicitly creating files on each cgroup creation. This\nlevel of flexibility isn\u0027t needed or desirable. It provides largely\nunused flexibility which call for abuses while severely limiting what\nthe core layer can do through the lack of structure and conventions.\n\nPer each cgroup file type, the only distinction that cgroup users is\nmaking is whether a cgroup is root or not, which can easily be\nexpressed with flags.\n\nThis patch introduces cgroup_add_cftypes(). These deal with cftypes\ninstead of individual files - controllers indicate that certain types\nof files exist for certain subsystem. Newly added CFTYPE_*_ON_ROOT\nflags indicate whether a cftype should be excluded or created only on\nthe root cgroup.\n\ncgroup_add_cftypes() can be called any time whether the target\nsubsystem is currently attached or not. cgroup core will create files\non the existing cgroups as necessary.\n\nAlso, cgroup_subsys-\u003ebase_cftypes is added to ease registration of the\nbase files for the subsystem. If non-NULL on subsys init, the cftypes\npointed to by -\u003ebase_cftypes are automatically registered on subsys\ninit / load.\n\nFurther patches will convert the existing users and remove the file\nbased interface. Note that this interface allows dynamic addition of\nfiles to an active controller. This will be used for sub-controller\nmodularity and unified hierarchy in the longer term.\n\nThis patch implements the new mechanism but doesn\u0027t apply it to any\nuser.\n\nv2: replaced DECLARE_CGROUP_CFTYPES[_COND]() with\n cgroup_subsys-\u003ebase_cftypes, which works better for cgroup_subsys\n which is loaded as module.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "b0ca5a84fc3ad8f75bb2b7ac3dc6a77151cd3906", "tree": "87dcdec8c3104ed00b34518b4dc1837e8c03d837", "parents": [ "ff4c8d503e2583b485da46d0ec3dcc29639ab889" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:54 2012 -0700" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Sun Apr 01 12:09:54 2012 -0700" }, "message": "cgroup: build list of all cgroups under a given cgroupfs_root\n\nBuild a list of all cgroups anchored at cgroupfs_root-\u003eallcg_list and\ngoing through cgroup-\u003eallcg_node. The list is protected by\ncgroup_mutex and will be used to improve cgroup file handling.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "42aee6c495e07dba7410b863a360db6bb9ec6d66", "tree": "d014b2b5c7aa9d1a1f13686fa06699f9f734ee1c", "parents": [ "9f7de8275b46d9d11b1505adbfe6c2bb48df4741" ], "author": { "name": "Hugh Dickins", "email": "hughd@google.com", "time": "Wed Mar 21 16:34:21 2012 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Mar 21 17:55:01 2012 -0700" }, "message": "cgroup: revert ss_id_lock to spinlock\n\nCommit c1e2ee2dc436 (\"memcg: replace ss-\u003eid_lock with a rwlock\") has now\nbeen seen to cause the unfair behavior we should have expected from\nconverting a spinlock to an rwlock: softlockup in cgroup_mkdir(), whose\nget_new_cssid() is waiting for the wlock, while there are 19 tasks using\nthe rlock in css_get_next() to get on with their memcg workload (in an\nartificial test, admittedly). Yet lib/idr.c was made suitable for RCU\nway back: revert that commit, restoring ss-\u003eid_lock to a spinlock.\n\nSigned-off-by: Hugh Dickins \u003chughd@google.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Eric Dumazet \u003ceric.dumazet@gmail.com\u003e\nAcked-by: Tejun Heo \u003ctj@kernel.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "761b3ef50e1c2649cffbfa67a4dcb2dcdb7982ed", "tree": "67ab6a9a2520811c9c0b4d70d1c19b4bfca16237", "parents": [ "61d1d219c4c0761059236a46867bc49943c4d29d" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Tue Jan 31 13:47:36 2012 +0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Thu Feb 02 09:20:22 2012 -0800" }, "message": "cgroup: remove cgroup_subsys argument from callbacks\n\nThe argument is not used at all, and it\u0027s not necessary, because\na specific callback handler of course knows which subsys it\nbelongs to.\n\nNow only -\u003epupulate() takes this argument, because the handlers of\nthis callback always call cgroup_add_file()/cgroup_add_files().\n\nSo we reduce a few lines of code, though the shrinking of object size\nis minimal.\n\n 16 files changed, 113 insertions(+), 162 deletions(-)\n\n text data bss dec hex filename\n5486240 656987 7039960 13183187 c928d3 vmlinux.o.orig\n5486170 656987 7039960 13183117 c9288d vmlinux.o\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "245282557c49754af3dbcc732316e814340d6bce", "tree": "e790dad8b26f273a3509d0a86fb4eec9589e54e7", "parents": [ "a63b9072ea4e32c1fde8b783ccf6e4288414660b" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Fri Jan 20 11:58:43 2012 +0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Jan 20 09:30:08 2012 -0800" }, "message": "cgroup: move struct cgroup_pidlist out from the header file\n\nIt\u0027s internally used only.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "a63b9072ea4e32c1fde8b783ccf6e4288414660b", "tree": "54403c1e791a34472357f643b2cbfec761a41b4b", "parents": [ "dcd6c92267155e70a94b3927bce681ce74b80d1f" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Fri Jan 20 11:58:09 2012 +0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Fri Jan 20 09:30:07 2012 -0800" }, "message": "cgroup: remove cgroup_attach_task_current_cg()\n\nIt\u0027s just a wrapper of cgroup_attach_task_all(), and it\u0027s no longer\nused after commit 87d6a412bd1ed82c14cabd4b408003b23bbd2880\n(vhost: fix attach to cgroups regression)\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\n" }, { "commit": "db0c2bf69aa095d4a6de7b1145f29fe9a7c0f6a3", "tree": "8f38957c01b18edddd44d49ecc3beeac08a20b4e", "parents": [ "ac69e0928054ff29a5049902fb477f9c7605c773", "0d19ea866562e46989412a0676412fa0983c9ce7" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Jan 09 12:59:24 2012 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Jan 09 12:59:24 2012 -0800" }, "message": "Merge branch \u0027for-3.3\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup\n\n* \u0027for-3.3\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (21 commits)\n cgroup: fix to allow mounting a hierarchy by name\n cgroup: move assignement out of condition in cgroup_attach_proc()\n cgroup: Remove task_lock() from cgroup_post_fork()\n cgroup: add sparse annotation to cgroup_iter_start() and cgroup_iter_end()\n cgroup: mark cgroup_rmdir_waitq and cgroup_attach_proc() as static\n cgroup: only need to check oldcgrp\u003d\u003dnewgrp once\n cgroup: remove redundant get/put of task struct\n cgroup: remove redundant get/put of old css_set from migrate\n cgroup: Remove unnecessary task_lock before fetching css_set on migration\n cgroup: Drop task_lock(parent) on cgroup_fork()\n cgroups: remove redundant get/put of css_set from css_set_check_fetched()\n resource cgroups: remove bogus cast\n cgroup: kill subsys-\u003ecan_attach_task(), pre_attach() and attach_task()\n cgroup, cpuset: don\u0027t use ss-\u003epre_attach()\n cgroup: don\u0027t use subsys-\u003ecan_attach_task() or -\u003eattach_task()\n cgroup: introduce cgroup_taskset and use it in subsys-\u003ecan_attach(), cancel_attach() and attach()\n cgroup: improve old cgroup handling in cgroup_attach_proc()\n cgroup: always lock threadgroup during migration\n threadgroup: extend threadgroup_lock() to cover exit and exec\n threadgroup: rename signal-\u003ethreadgroup_fork_lock to -\u003egroup_rwsem\n ...\n\nFix up conflict in kernel/cgroup.c due to commit e0197aae59e5: \"cgroups:\nfix a css_set not found bug in cgroup_attach_proc\" that already\nmentioned that the bug is fixed (differently) in Tejun\u0027s cgroup\npatchset. This one, in other words.\n" }, { "commit": "a5e7ed3287e45f2eafbcf9e7e6fdc5a0191acf40", "tree": "4bc526f45eb2e9ab01beca0207f8633a19b963b8", "parents": [ "f9ec80061af2116e9b6298a6334a6f288d7ea878" ], "author": { "name": "Al Viro", "email": "viro@zeniv.linux.org.uk", "time": "Tue Jul 26 01:55:55 2011 -0400" }, "committer": { "name": "Al Viro", "email": "viro@zeniv.linux.org.uk", "time": "Tue Jan 03 22:55:03 2012 -0500" }, "message": "cgroup: propagate mode_t\n\nSigned-off-by: Al Viro \u003cviro@zeniv.linux.org.uk\u003e\n" }, { "commit": "494c167cf76d02000adf740c215adc69a824ecc9", "tree": "bf7cdf462b62ebf099b965f7bea503df30918c17", "parents": [ "94196f51c1ee5bbad674de28c682b17d78adb8e6" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Dec 12 18:12:22 2011 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Dec 12 18:12:22 2011 -0800" }, "message": "cgroup: kill subsys-\u003ecan_attach_task(), pre_attach() and attach_task()\n\nThese three methods are no longer used. Kill them.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Frederic Weisbecker \u003cfweisbec@gmail.com\u003e\nAcked-by: Paul Menage \u003cpaul@paulmenage.org\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "2f7ee5691eecb67c8108b92001a85563ea336ac5", "tree": "18cf60ea8a463f4a6cd59c68926ba4357ae8ff4c", "parents": [ "134d33737f9015761c3832f6b268fae6274aac7f" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Dec 12 18:12:21 2011 -0800" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Dec 12 18:12:21 2011 -0800" }, "message": "cgroup: introduce cgroup_taskset and use it in subsys-\u003ecan_attach(), cancel_attach() and attach()\n\nCurrently, there\u0027s no way to pass multiple tasks to cgroup_subsys\nmethods necessitating the need for separate per-process and per-task\nmethods. This patch introduces cgroup_taskset which can be used to\npass multiple tasks and their associated cgroups to cgroup_subsys\nmethods.\n\nThree methods - can_attach(), cancel_attach() and attach() - are\nconverted to use cgroup_taskset. This unifies passed parameters so\nthat all methods have access to all information. Conversions in this\npatchset are identical and don\u0027t introduce any behavior change.\n\n-v2: documentation updated as per Paul Menage\u0027s suggestion.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nReviewed-by: Frederic Weisbecker \u003cfweisbec@gmail.com\u003e\nAcked-by: Paul Menage \u003cpaul@paulmenage.org\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: James Morris \u003cjmorris@namei.org\u003e\n" }, { "commit": "c1e2ee2dc436574880758b3836fc96935b774c32", "tree": "aa496a9ba20e06749194faa4dbb14b6046e6b06b", "parents": [ "080d676de095a14ecba14c0b9a91acb5bbb634df" ], "author": { "name": "Andrew Bresticker", "email": "abrestic@google.com", "time": "Wed Nov 02 13:40:29 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 02 16:07:03 2011 -0700" }, "message": "memcg: replace ss-\u003eid_lock with a rwlock\n\nWhile back-porting Johannes Weiner\u0027s patch \"mm: memcg-aware global\nreclaim\" for an internal effort, we noticed a significant performance\nregression during page-reclaim heavy workloads due to high contention of\nthe ss-\u003eid_lock. This lock protects idr map, and serializes calls to\nidr_get_next() in css_get_next() (which is used during the memcg hierarchy\nwalk).\n\nSince idr_get_next() is just doing a look up, we need only serialize it\nwith respect to idr_remove()/idr_get_new(). By making the ss-\u003eid_lock a\nrwlock, contention is greatly reduced and performance improves.\n\nTested: cat a 256m file from a ramdisk in a 128m container 50 times on\neach core (one file + container per core) in parallel on a NUMA machine.\nResult is the time for the test to complete in 1 of the containers.\nBoth kernels included Johannes\u0027 memcg-aware global reclaim patches.\n\nBefore rwlock patch: 1710.778s\nAfter rwlock patch: 152.227s\n\nSigned-off-by: Andrew Bresticker \u003cabrestic@google.com\u003e\nCc: Paul Menage \u003cmenage@gmail.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Ying Han \u003cyinghan@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d8bf4ca9ca9576548628344c9725edd3786e90b1", "tree": "df338f50a5af6bc3651bd863b79fa91e6b1e9e20", "parents": [ "eb032b9837a958e21ca000358a5bde5e17192ddb" ], "author": { "name": "Michal Hocko", "email": "mhocko@suse.cz", "time": "Fri Jul 08 14:39:41 2011 +0200" }, "committer": { "name": "Jiri Kosina", "email": "jkosina@suse.cz", "time": "Fri Jul 08 22:21:58 2011 +0200" }, "message": "rcu: treewide: Do not use rcu_read_lock_held when calling rcu_dereference_check\n\nSince ca5ecddf (rcu: define __rcu address space modifier for sparse)\nrcu_dereference_check use rcu_read_lock_held as a part of condition\nautomatically so callers do not have to do that as well.\n\nSigned-off-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: Paul E. McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nSigned-off-by: Jiri Kosina \u003cjkosina@suse.cz\u003e\n" }, { "commit": "a77aea92010acf54ad785047234418d5d68772e2", "tree": "c7cb57b62fd02bee2baceb79251923f7caec6139", "parents": [ "d846687d7f84e45f23ecf3846dbb43312a1206dd" ], "author": { "name": "Daniel Lezcano", "email": "daniel.lezcano@free.fr", "time": "Thu May 26 16:25:23 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu May 26 17:12:34 2011 -0700" }, "message": "cgroup: remove the ns_cgroup\n\nThe ns_cgroup is an annoying cgroup at the namespace / cgroup frontier and\nleads to some problems:\n\n * cgroup creation is out-of-control\n * cgroup name can conflict when pids are looping\n * it is not possible to have a single process handling a lot of\n namespaces without falling in a exponential creation time\n * we may want to create a namespace without creating a cgroup\n\n The ns_cgroup was replaced by a compatibility flag \u0027clone_children\u0027,\n where a newly created cgroup will copy the parent cgroup values.\n The userspace has to manually create a cgroup and add a task to\n the \u0027tasks\u0027 file.\n\nThis patch removes the ns_cgroup as suggested in the following thread:\n\nhttps://lists.linux-foundation.org/pipermail/containers/2009-June/018616.html\n\nThe \u0027cgroup_clone\u0027 function is removed because it is no longer used.\n\nThis is a userspace-visible change. Commit 45531757b45c (\"cgroup: notify\nns_cgroup deprecated\") (merged into 2.6.27) caused the kernel to emit a\nprintk warning users that the feature is planned for removal. Since that\ntime we have heard from XXX users who were affected by this.\n\nSigned-off-by: Daniel Lezcano \u003cdaniel.lezcano@free.fr\u003e\nSigned-off-by: Serge E. Hallyn \u003cserge.hallyn@canonical.com\u003e\nCc: Eric W. Biederman \u003cebiederm@xmission.com\u003e\nCc: Jamal Hadi Salim \u003chadi@cyberus.ca\u003e\nReviewed-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "f780bdb7c1c73009cb57adcf99ef50027d80bf3c", "tree": "d15668ffcc40a2aaa31723b87cfda0b166f84d57", "parents": [ "4714d1d32d97239fb5ae3e10521d3f133a899b66" ], "author": { "name": "Ben Blum", "email": "bblum@andrew.cmu.edu", "time": "Thu May 26 16:25:19 2011 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu May 26 17:12:34 2011 -0700" }, "message": "cgroups: add per-thread subsystem callbacks\n\nAdd cgroup subsystem callbacks for per-thread attachment in atomic contexts\n\nAdd can_attach_task(), pre_attach(), and attach_task() as new callbacks\nfor cgroups\u0027s subsystem interface. Unlike can_attach and attach, these\nare for per-thread operations, to be called potentially many times when\nattaching an entire threadgroup.\n\nAlso, the old \"bool threadgroup\" interface is removed, as replaced by\nthis. All subsystems are modified for the new interface - of note is\ncpuset, which requires from/to nodemasks for attach to be globally scoped\n(though per-cpuset would work too) to persist from its pre_attach to\nattach_task and attach.\n\nThis is a pre-patch for cgroup-procs-writable.patch.\n\nSigned-off-by: Ben Blum \u003cbblum@andrew.cmu.edu\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nReviewed-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Miao Xie \u003cmiaox@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "25985edcedea6396277003854657b5f3cb31a628", "tree": "f026e810210a2ee7290caeb737c23cb6472b7c38", "parents": [ "6aba74f2791287ec407e0f92487a725a25908067" ], "author": { "name": "Lucas De Marchi", "email": "lucas.demarchi@profusion.mobi", "time": "Wed Mar 30 22:57:33 2011 -0300" }, "committer": { "name": "Lucas De Marchi", "email": "lucas.demarchi@profusion.mobi", "time": "Thu Mar 31 11:26:23 2011 -0300" }, "message": "Fix common misspellings\n\nFixes generated by \u0027codespell\u0027 and manually reviewed.\n\nSigned-off-by: Lucas De Marchi \u003clucas.demarchi@profusion.mobi\u003e\n" }, { "commit": "e5d1367f17ba6a6fed5fd8b74e4d5720923e0c25", "tree": "5862b4cddb7c88e0513e503cb3f46c60da2eeb6f", "parents": [ "d41d5a01631af821d3a3447e6613a316f5ee6c25" ], "author": { "name": "Stephane Eranian", "email": "eranian@google.com", "time": "Mon Feb 14 11:20:01 2011 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Wed Feb 16 13:30:48 2011 +0100" }, "message": "perf: Add cgroup support\n\nThis kernel patch adds the ability to filter monitoring based on\ncontainer groups (cgroups). This is for use in per-cpu mode only.\n\nThe cgroup to monitor is passed as a file descriptor in the pid\nargument to the syscall. The file descriptor must be opened to\nthe cgroup name in the cgroup filesystem. For instance, if the\ncgroup name is foo and cgroupfs is mounted in /cgroup, then the\nfile descriptor is opened to /cgroup/foo. Cgroup mode is\nactivated by passing PERF_FLAG_PID_CGROUP in the flags argument\nto the syscall.\n\nFor instance to measure in cgroup foo on CPU1 assuming\ncgroupfs is mounted under /cgroup:\n\nstruct perf_event_attr attr;\nint cgroup_fd, fd;\n\ncgroup_fd \u003d open(\"/cgroup/foo\", O_RDONLY);\nfd \u003d perf_event_open(\u0026attr, cgroup_fd, 1, -1, PERF_FLAG_PID_CGROUP);\nclose(cgroup_fd);\n\nSigned-off-by: Stephane Eranian \u003ceranian@google.com\u003e\n[ added perf_cgroup_{exit,attach} ]\nSigned-off-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nLKML-Reference: \u003c4d590250.114ddf0a.689e.4482@mx.google.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "d41d5a01631af821d3a3447e6613a316f5ee6c25", "tree": "405ab6bc24e06a64dc17ccafb6daead1400cb29e", "parents": [ "b00560f2d4de69bb12f66f9605985b516df98d77" ], "author": { "name": "Peter Zijlstra", "email": "a.p.zijlstra@chello.nl", "time": "Mon Feb 07 17:02:20 2011 +0100" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Wed Feb 16 13:30:47 2011 +0100" }, "message": "cgroup: Fix cgroup_subsys::exit callback\n\nMake the ::exit method act like ::attach, it is after all very nearly\nthe same thing.\n\nThe bug had no effect on correctness - fixing it is an optimization for\nthe scheduler. Also, later perf-cgroups patches rely on it.\n\nSigned-off-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nLKML-Reference: \u003c1297160655.13327.92.camel@laptop\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "b595076a180a56d1bb170e6eceda6eb9d76f4cd3", "tree": "bc01ec7283808013e0b8ce7713fd6fc40f810429", "parents": [ "6aaccece1c483f189f76f1282b3984ff4c7ecb0a" ], "author": { "name": "Uwe Kleine-König", "email": "u.kleine-koenig@pengutronix.de", "time": "Mon Nov 01 15:38:34 2010 -0400" }, "committer": { "name": "Jiri Kosina", "email": "jkosina@suse.cz", "time": "Mon Nov 01 15:38:34 2010 -0400" }, "message": "tree-wide: fix comment/printk typos\n\n\"gadget\", \"through\", \"command\", \"maintain\", \"maintain\", \"controller\", \"address\",\n\"between\", \"initiali[zs]e\", \"instead\", \"function\", \"select\", \"already\",\n\"equal\", \"access\", \"management\", \"hierarchy\", \"registration\", \"interest\",\n\"relative\", \"memory\", \"offset\", \"already\",\n\nSigned-off-by: Uwe Kleine-König \u003cu.kleine-koenig@pengutronix.de\u003e\nSigned-off-by: Jiri Kosina \u003cjkosina@suse.cz\u003e\n" }, { "commit": "97978e6d1f2da0073416870410459694fbdbfd9b", "tree": "e8ff2fe4119d03fa54a45e8a101adbf9fb91a385", "parents": [ "2d3cbf8bc852ac1bc3d098186143c5973f87b753" ], "author": { "name": "Daniel Lezcano", "email": "daniel.lezcano@free.fr", "time": "Wed Oct 27 15:33:35 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Oct 27 18:03:09 2010 -0700" }, "message": "cgroup: add clone_children control file\n\nThe ns_cgroup is a control group interacting with the namespaces. When a\nnew namespace is created, a corresponding cgroup is automatically created\ntoo. The cgroup name is the pid of the process who did \u0027unshare\u0027 or the\nchild of \u0027clone\u0027.\n\nThis cgroup is tied with the namespace because it prevents a process to\nescape the control group and use the post_clone callback, so the child\ncgroup inherits the values of the parent cgroup.\n\nUnfortunately, the more we use this cgroup and the more we are facing\nproblems with it:\n\n(1) when a process unshares, the cgroup name may conflict with a\n previous cgroup with the same pid, so unshare or clone return -EEXIST\n\n(2) the cgroup creation is out of control because there may have an\n application creating several namespaces where the system will\n automatically create several cgroups in his back and let them on the\n cgroupfs (eg. a vrf based on the network namespace).\n\n(3) the mix of (1) and (2) force an administrator to regularly check\n and clean these cgroups.\n\nThis patchset removes the ns_cgroup by adding a new flag to the cgroup and\nthe cgroupfs mount option. It enables the copy of the parent cgroup when\na child cgroup is created. We can then safely remove the ns_cgroup as\nthis flag brings a compatibility. We have now to manually create and add\nthe task to a cgroup, which is consistent with the cgroup framework.\n\nThis patch:\n\nSent as an answer to a previous thread around the ns_cgroup.\n\nhttps://lists.linux-foundation.org/pipermail/containers/2009-June/018627.html\n\nIt adds a control file \u0027clone_children\u0027 for a cgroup. This control file\nis a boolean specifying if the child cgroup should be a clone of the\nparent cgroup or not. The default value is \u0027false\u0027.\n\nThis flag makes the child cgroup to call the post_clone callback of all\nthe subsystem, if it is available.\n\nAt present, the cpuset is the only one which had implemented the\npost_clone callback.\n\nThe option can be set at mount time by specifying the \u0027clone_children\u0027\nmount option.\n\nSigned-off-by: Daniel Lezcano \u003cdaniel.lezcano@free.fr\u003e\nSigned-off-by: Serge E. Hallyn \u003cserge.hallyn@canonical.com\u003e\nCc: Eric W. Biederman \u003cebiederm@xmission.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nReviewed-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Jamal Hadi Salim \u003chadi@cyberus.ca\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nAcked-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d4f8f217b8a5d5bd02af979650418dca4caec472", "tree": "af047bfa9729c975e24cb7624107574e884d3a57", "parents": [ "2dfbf4dfbe47a484bae20456c12b40763b9b6af7", "773e3f93577ffb493fb7c39b1a6ecf39b5748e87" ], "author": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Thu Oct 07 09:43:11 2010 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Thu Oct 07 09:43:11 2010 +0200" }, "message": "Merge branch \u0027rcu/urgent\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu\n" }, { "commit": "31583bb0cf6cc40f2a468a4d2f3b9cbefd24f891", "tree": "1c9ff4ff83ef80fe0b9b5d6fa7ec9af1ebbc2209", "parents": [ "ed430fec756ad65f7cfba24f8ad17c3d5a403290" ], "author": { "name": "Michael S. Tsirkin", "email": "mst@redhat.com", "time": "Thu Sep 09 16:37:37 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 09 18:57:23 2010 -0700" }, "message": "cgroups: fix API thinko\n\nAdd cgroup_attach_task_all()\n\nThe existing cgroup_attach_task_current_cg() API is called by a thread to\nattach another thread to all of its cgroups; this is unsuitable for cases\nwhere a privileged task wants to attach itself to the cgroups of a less\nprivileged one, since the call must be made from the context of the target\ntask.\n\nThis patch adds a more generic cgroup_attach_task_all() API that allows\nboth the source task and to-be-moved task to be specified.\ncgroup_attach_task_current_cg() becomes a specialization of the more\ngeneric new function.\n\n[menage@google.com: rewrote changelog]\n[akpm@linux-foundation.org: address reviewer comments]\nSigned-off-by: Michael S. Tsirkin \u003cmst@redhat.com\u003e\nTested-by: Alex Williamson \u003calex.williamson@redhat.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Ben Blum \u003cbblum@google.com\u003e\nCc: Sridhar Samudrala \u003csri@us.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "2c392b8c3450ceb69ba1b93cb0cddb3998fb8cdc", "tree": "4e8e9414afe539baa66eacad9c99dd3bc15feabc", "parents": [ "67bdbffd696f29a0b68aa8daa285783a06651583" ], "author": { "name": "Arnd Bergmann", "email": "arnd@arndb.de", "time": "Wed Feb 24 19:41:39 2010 +0100" }, "committer": { "name": "Paul E. McKenney", "email": "paulmck@linux.vnet.ibm.com", "time": "Thu Aug 19 17:18:00 2010 -0700" }, "message": "cgroups: __rcu annotations\n\nSigned-off-by: Arnd Bergmann \u003carnd@arndb.de\u003e\nSigned-off-by: Paul E. McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nReviewed-by: Josh Triplett \u003cjosh@joshtriplett.org\u003e\n" }, { "commit": "6ba74014c1ab0e37af7de6f64b4eccbbae3cb9e7", "tree": "8f3892fc44f1e403675a6d7e88fda5c70e56ee4c", "parents": [ "5abd9ccced7a726c817dd6b5b96bc933859138d1", "3ff1c25927e3af61c6bf0e4ed959504058ae4565" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Aug 04 11:47:58 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Aug 04 11:47:58 2010 -0700" }, "message": "Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6\n\n* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1443 commits)\n phy/marvell: add 88ec048 support\n igb: Program MDICNFG register prior to PHY init\n e1000e: correct MAC-PHY interconnect register offset for 82579\n hso: Add new product ID\n can: Add driver for esd CAN-USB/2 device\n l2tp: fix export of header file for userspace\n can-raw: Fix skb_orphan_try handling\n Revert \"net: remove zap_completion_queue\"\n net: cleanup inclusion\n phy/marvell: add 88e1121 interface mode support\n u32: negative offset fix\n net: Fix a typo from \"dev\" to \"ndev\"\n igb: Use irq_synchronize per vector when using MSI-X\n ixgbevf: fix null pointer dereference due to filter being set for VLAN 0\n e1000e: Fix irq_synchronize in MSI-X case\n e1000e: register pm_qos request on hardware activation\n ip_fragment: fix subtracting PPPOE_SES_HLEN from mtu twice\n net: Add getsockopt support for TCP thin-streams\n cxgb4: update driver version\n cxgb4: add new PCI IDs\n ...\n\nManually fix up conflicts in:\n - drivers/net/e1000e/netdev.c: due to pm_qos registration\n infrastructure changes\n - drivers/net/phy/marvell.c: conflict between adding 88ec048 support\n and cleaning up the IDs\n - drivers/net/wireless/ipw2x00/ipw2100.c: trivial ipw2100_pm_qos_req\n conflict (registration change vs marking it static)\n" }, { "commit": "d7926ee38f5c6e0bbebe712304f99a4c67e40f84", "tree": "2feae78726dae032741f81fc9590d61693a182f5", "parents": [ "c23f3445e68e1db0e74099f264bc5ff5d55ebdeb" ], "author": { "name": "Sridhar Samudrala", "email": "samudrala.sridhar@gmail.com", "time": "Sun May 30 22:24:39 2010 +0200" }, "committer": { "name": "Michael S. Tsirkin", "email": "mst@redhat.com", "time": "Wed Jul 28 15:45:12 2010 +0300" }, "message": "cgroups: Add an API to attach a task to current task\u0027s cgroup\n\nAdd a new kernel API to attach a task to current task\u0027s cgroup\nin all the active hierarchies.\n\nSigned-off-by: Sridhar Samudrala \u003csri@us.ibm.com\u003e\nSigned-off-by: Michael S. Tsirkin \u003cmst@redhat.com\u003e\nReviewed-by: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\n" }, { "commit": "dc61b1d65e353d638b2445f71fb8e5b5630f2415", "tree": "07d79b2d385a380207cd889ac764b57190421fd1", "parents": [ "3975d16760d4be7402d1067c548c30c427971331" ], "author": { "name": "Peter Zijlstra", "email": "a.p.zijlstra@chello.nl", "time": "Tue Jun 08 11:40:42 2010 +0200" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Tue Jun 08 18:44:04 2010 +0200" }, "message": "sched: Fix PROVE_RCU vs cpu_cgroup\n\nPROVE_RCU has a few issues with the cpu_cgroup because the scheduler\ntypically holds rq-\u003elock around the css rcu derefs but the generic\ncgroup code doesn\u0027t (and can\u0027t) know about that lock.\n\nProvide means to add extra checks to the css dereference and use that\nin the scheduler to annotate its users.\n\nThe addition of rq-\u003elock to these checks is correct because the\ncgroup_subsys::attach() method takes the rq-\u003elock for each task it\nmoves, therefore by holding that lock, we ensure the task is pinned to\nthe current cgroup and the RCU derefence is valid.\n\nThat leaves one genuine race in __sched_setscheduler() where we used\ntask_group() without holding any of the required locks and thus raced\nwith the cgroup code. Solve this by moving the check under the\nappropriate lock.\n\nSigned-off-by: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@linux.vnet.ibm.com\u003e\nLKML-Reference: \u003cnew-submission\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "907860ed381a31b0102f362df67c1c5cae6ef050", "tree": "4f47a6fe898b1f45da505fc0c27d98e66d42aa46", "parents": [ "ac39cf8cb86c45eeac6a592ce0d58f9021a97235" ], "author": { "name": "Kirill A. Shutemov", "email": "kirill@shutemov.name", "time": "Wed May 26 14:42:46 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu May 27 09:12:44 2010 -0700" }, "message": "cgroups: make cftype.unregister_event() void-returning\n\nSince we are unable to handle an error returned by\ncftype.unregister_event() properly, let\u0027s make the callback\nvoid-returning.\n\nmem_cgroup_unregister_event() has been rewritten to be a \"never fail\"\nfunction. On mem_cgroup_usage_register_event() we save old buffer for\nthresholds array and reuse it in mem_cgroup_usage_unregister_event() to\navoid allocation.\n\nSigned-off-by: Kirill A. Shutemov \u003ckirill@shutemov.name\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Phil Carmody \u003cext-phil.2.carmody@nokia.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "1ce7e4ff24fe338438bc7837e02780f202bf202b", "tree": "3906643ba96ba8b3fda2291e5e40e48bbba9085f", "parents": [ "b629317e66fb1c6066c550dded45ab85a936163c" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Fri Apr 23 10:35:52 2010 +0800" }, "committer": { "name": "Paul E. McKenney", "email": "paulmck@linux.vnet.ibm.com", "time": "Tue May 04 09:25:02 2010 -0700" }, "message": "cgroup: Check task_lock in task_subsys_state()\n\nExpand task_subsys_state()\u0027s rcu_dereference_check() to include the full\nlocking rule as documented in Documentation/cgroups/cgroups.txt by adding\na check for task-\u003ealloc_lock being held.\n\nThis fixes an RCU false positive when resuming from suspend. The warning\ncomes from freezer cgroup in cgroup_freezing_or_frozen().\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nSigned-off-by: Paul E. McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\n" }, { "commit": "a0a4db548edcce067c1201ef25cf2bc29f32dca4", "tree": "6f8139a582179666cd248d978332ed0e32ad9f0f", "parents": [ "4ab78683c17d739c2a2077141dcf81a02b7fb57e" ], "author": { "name": "Kirill A. Shutemov", "email": "kirill@shutemov.name", "time": "Wed Mar 10 15:22:34 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:37 2010 -0800" }, "message": "cgroups: remove events before destroying subsystem state objects\n\nEvents should be removed after rmdir of cgroup directory, but before\ndestroying subsystem state objects. Let\u0027s take reference to cgroup\ndirectory dentry to do that.\n\nSigned-off-by: Kirill A. Shutemov \u003ckirill@shutemov.name\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hioryu@jp.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nCc: Dan Malek \u003cdan@embeddedalley.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "0dea116876eefc9c7ca9c5d74fe665481e499fa3", "tree": "446ef64c99a234cf076b6d43efe42c8b48a928c7", "parents": [ "483c30b514bd3037fa3f19fa42327c94c10f51c8" ], "author": { "name": "Kirill A. Shutemov", "email": "kirill@shutemov.name", "time": "Wed Mar 10 15:22:20 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:37 2010 -0800" }, "message": "cgroup: implement eventfd-based generic API for notifications\n\nThis patchset introduces eventfd-based API for notifications in cgroups\nand implements memory notifications on top of it.\n\nIt uses statistics in memory controler to track memory usage.\n\nOutput of time(1) on building kernel on tmpfs:\n\nRoot cgroup before changes:\n\tmake -j2 506.37 user 60.93s system 193% cpu 4:52.77 total\nNon-root cgroup before changes:\n\tmake -j2 507.14 user 62.66s system 193% cpu 4:54.74 total\nRoot cgroup after changes (0 thresholds):\n\tmake -j2 507.13 user 62.20s system 193% cpu 4:53.55 total\nNon-root cgroup after changes (0 thresholds):\n\tmake -j2 507.70 user 64.20s system 193% cpu 4:55.70 total\nRoot cgroup after changes (1 thresholds, never crossed):\n\tmake -j2 506.97 user 62.20s system 193% cpu 4:53.90 total\nNon-root cgroup after changes (1 thresholds, never crossed):\n\tmake -j2 507.55 user 64.08s system 193% cpu 4:55.63 total\n\nThis patch:\n\nIntroduce the write-only file \"cgroup.event_control\" in every cgroup.\n\nTo register new notification handler you need:\n- create an eventfd;\n- open a control file to be monitored. Callbacks register_event() and\n unregister_event() must be defined for the control file;\n- write \"\u003cevent_fd\u003e \u003ccontrol_fd\u003e \u003cargs\u003e\" to cgroup.event_control.\n Interpretation of args is defined by control file implementation;\n\neventfd will be woken up by control file implementation or when the\ncgroup is removed.\n\nTo unregister notification handler just close eventfd.\n\nIf you need notification functionality for a control file you have to\nimplement callbacks register_event() and unregister_event() in the\nstruct cftype.\n\n[kamezawa.hiroyu@jp.fujitsu.com: Kconfig fix]\nSigned-off-by: Kirill A. Shutemov \u003ckirill@shutemov.name\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nPaul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nCc: Dan Malek \u003cdan@embeddedalley.com\u003e\nCc: Vladislav Buzov \u003cvbuzov@embeddedalley.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: Alexander Shishkin \u003cvirtuoso@slind.org\u003e\nCc: Davide Libenzi \u003cdavidel@xmailserver.org\u003e\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "cf5d5941fda647fe3d2f2d00cf9e0245236a5f08", "tree": "deee6501f2f08089a2cd62732c3848a59a6f6a93", "parents": [ "e6a1105ba08b265023dd71a4174fb4a29ebc7083" ], "author": { "name": "Ben Blum", "email": "bblum@andrew.cmu.edu", "time": "Wed Mar 10 15:22:09 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:36 2010 -0800" }, "message": "cgroups: subsystem module unloading\n\nProvides support for unloading modular subsystems.\n\nThis patch adds a new function cgroup_unload_subsys which is to be used\nfor removing a loaded subsystem during module deletion. Reference\ncounting of the subsystems\u0027 modules is moved from once (at load time) to\nonce per attached hierarchy (in parse_cgroupfs_options and\nrebind_subsystems) (i.e., 0 or 1).\n\nSigned-off-by: Ben Blum \u003cbblum@andrew.cmu.edu\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e6a1105ba08b265023dd71a4174fb4a29ebc7083", "tree": "c171a012df4364b0feac5d6f1bf8c354164ab0f9", "parents": [ "aae8aab40367036931608fdaf9e2dc568b516f19" ], "author": { "name": "Ben Blum", "email": "bblum@andrew.cmu.edu", "time": "Wed Mar 10 15:22:09 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:36 2010 -0800" }, "message": "cgroups: subsystem module loading interface\n\nAdd interface between cgroups subsystem management and module loading\n\nThis patch implements rudimentary module-loading support for cgroups -\nnamely, a cgroup_load_subsys (similar to cgroup_init_subsys) for use as a\nmodule initcall, and a struct module pointer in struct cgroup_subsys.\n\nSeveral functions that might be wanted by modules have had EXPORT_SYMBOL\nadded to them, but it\u0027s unclear exactly which functions want it and which\nwon\u0027t.\n\nSigned-off-by: Ben Blum \u003cbblum@andrew.cmu.edu\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "aae8aab40367036931608fdaf9e2dc568b516f19", "tree": "b2a06ee21042eb3972ecd9e4153d61a8f6ed53cb", "parents": [ "d7b9fff711d5e8db8c844161c684017e556c38a0" ], "author": { "name": "Ben Blum", "email": "bblum@andrew.cmu.edu", "time": "Wed Mar 10 15:22:07 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:36 2010 -0800" }, "message": "cgroups: revamp subsys array\n\nThis patch series provides the ability for cgroup subsystems to be\ncompiled as modules both within and outside the kernel tree. This is\nmainly useful for classifiers and subsystems that hook into components\nthat are already modules. cls_cgroup and blkio-cgroup serve as the\nexample use cases for this feature.\n\nIt provides an interface cgroup_load_subsys() and cgroup_unload_subsys()\nwhich modular subsystems can use to register and depart during runtime.\nThe net_cls classifier subsystem serves as the example for a subsystem\nwhich can be converted into a module using these changes.\n\nPatch #1 sets up the subsys[] array so its contents can be dynamic as\nmodules appear and (eventually) disappear. Iterations over the array are\nmodified to handle when subsystems are absent, and the dynamic section of\nthe array is protected by cgroup_mutex.\n\nPatch #2 implements an interface for modules to load subsystems, called\ncgroup_load_subsys, similar to cgroup_init_subsys, and adds a module\npointer in struct cgroup_subsys.\n\nPatch #3 adds a mechanism for unloading modular subsystems, which includes\na more advanced rework of the rudimentary reference counting introduced in\npatch 2.\n\nPatch #4 modifies the net_cls subsystem, which already had some module\ndeclarations, to be configurable as a module, which also serves as a\nsimple proof-of-concept.\n\nPart of implementing patches 2 and 4 involved updating css pointers in\neach css_set when the module appears or leaves. In doing this, it was\ndiscovered that css_sets always remain linked to the dummy cgroup,\nregardless of whether or not any subsystems are actually bound to it\n(i.e., not mounted on an actual hierarchy). The subsystem loading and\nunloading code therefore should keep in mind the special cases where the\nadded subsystem is the only one in the dummy cgroup (and therefore all\ncss_sets need to be linked back into it) and where the removed subsys was\nthe only one in the dummy cgroup (and therefore all css_sets should be\nunlinked from it) - however, as all css_sets always stay attached to the\ndummy cgroup anyway, these cases are ignored. Any fix that addresses this\nissue should also make sure these cases are addressed in the subsystem\nloading and unloading code.\n\nThis patch:\n\nMake subsys[] able to be dynamically populated to support modular\nsubsystems\n\nThis patch reworks the way the subsys[] array is used so that subsystems\ncan register themselves after boot time, and enables the internals of\ncgroups to be able to handle when subsystems are not present or may\nappear/disappear.\n\nSigned-off-by: Ben Blum \u003cbblum@andrew.cmu.edu\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: \"David S. Miller\" \u003cdavem@davemloft.net\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d7b9fff711d5e8db8c844161c684017e556c38a0", "tree": "fea09ff79fe543edc2d8c0e85d35de1b2c783f2d", "parents": [ "2468c7234b366eeb799ee0648cb58f9cba394a54" ], "author": { "name": "Daisuke Nishimura", "email": "nishimura@mxp.nes.nec.co.jp", "time": "Wed Mar 10 15:22:05 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:36 2010 -0800" }, "message": "cgroup: introduce coalesce css_get() and css_put()\n\nCurrent css_get() and css_put() increment/decrement css-\u003erefcnt one by\none.\n\nThis patch add a new function __css_get(), which takes \"count\" as a arg\nand increment the css-\u003erefcnt by \"count\". And this patch also add a new\narg(\"count\") to __css_put() and change the function to decrement the\ncss-\u003erefcnt by \"count\".\n\nThese coalesce version of __css_get()/__css_put() will be used to improve\nperformance of memcg\u0027s moving charge feature later, where instead of\ncalling css_get()/css_put() repeatedly, these new functions will be used.\n\nNo change is needed for current users of css_get()/css_put().\n\nSigned-off-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "2468c7234b366eeb799ee0648cb58f9cba394a54", "tree": "050d7ea224b975eb71b05bf472f14f4c7bb13670", "parents": [ "5ce9f07bf1bed9a1f9886373ad0b149294f84c25" ], "author": { "name": "Daisuke Nishimura", "email": "nishimura@mxp.nes.nec.co.jp", "time": "Wed Mar 10 15:22:03 2010 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Mar 12 15:52:35 2010 -0800" }, "message": "cgroup: introduce cancel_attach()\n\nAdd cancel_attach() operation to struct cgroup_subsys. cancel_attach()\ncan be used when can_attach() operation prepares something for the subsys,\nbut we should rollback what can_attach() operation has prepared if attach\ntask fails after we\u0027ve succeeded in can_attach().\n\nSigned-off-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nReviewed-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d11c563dd20ff35da5652c3e1c989d9e10e1d6d0", "tree": "b189f50de7a01d7603935d4da7e755d764dfe67e", "parents": [ "a898def29e4119bc01ebe7ca97423181f4c0ea2d" ], "author": { "name": "Paul E. McKenney", "email": "paulmck@linux.vnet.ibm.com", "time": "Mon Feb 22 17:04:50 2010 -0800" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Thu Feb 25 10:34:26 2010 +0100" }, "message": "sched: Use lockdep-based checking on rcu_dereference()\n\nUpdate the rcu_dereference() usages to take advantage of the new\nlockdep-based checking.\n\nSigned-off-by: Paul E. McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nCc: laijs@cn.fujitsu.com\nCc: dipankar@in.ibm.com\nCc: mathieu.desnoyers@polymtl.ca\nCc: josh@joshtriplett.org\nCc: dvhltc@us.ibm.com\nCc: niv@us.ibm.com\nCc: peterz@infradead.org\nCc: rostedt@goodmis.org\nCc: Valdis.Kletnieks@vt.edu\nCc: dhowells@redhat.com\nLKML-Reference: \u003c1266887105-1528-6-git-send-email-paulmck@linux.vnet.ibm.com\u003e\n[ -v2: fix allmodconfig missing symbol export build failure on x86 ]\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "828c09509b9695271bcbdc53e9fc9a6a737148d2", "tree": "072ffad6f02db7bf4095e07e2b90247cfa042998", "parents": [ "1c4115e595dec42aa0e81ba47ef46e35b34ed428" ], "author": { "name": "Alexey Dobriyan", "email": "adobriyan@gmail.com", "time": "Thu Oct 01 15:43:56 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 01 16:11:11 2009 -0700" }, "message": "const: constify remaining file_operations\n\n[akpm@linux-foundation.org: fix KVM]\nSigned-off-by: Alexey Dobriyan \u003cadobriyan@gmail.com\u003e\nAcked-by: Mike Frysinger \u003cvapier@gentoo.org\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "be367d09927023d081f9199665c8500f69f14d22", "tree": "f0c5b9da037506da3c5890cf11b51b39a7d3c427", "parents": [ "c378369d8b4fa516ff2b1e79c3eded4e0e955ebb" ], "author": { "name": "Ben Blum", "email": "bblum@google.com", "time": "Wed Sep 23 15:56:31 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:20:58 2009 -0700" }, "message": "cgroups: let ss-\u003ecan_attach and ss-\u003eattach do whole threadgroups at a time\n\nAlter the ss-\u003ecan_attach and ss-\u003eattach functions to be able to deal with\na whole threadgroup at a time, for use in cgroup_attach_proc. (This is a\npre-patch to cgroup-procs-writable.patch.)\n\nCurrently, new mode of the attach function can only tell the subsystem\nabout the old cgroup of the threadgroup leader. No subsystem currently\nneeds that information for each thread that\u0027s being moved, but if one were\nto be added (for example, one that counts tasks within a group) this bit\nwould need to be reworked a bit to tell the subsystem the right\ninformation.\n\n[hidave.darkstar@gmail.com: fix build]\nSigned-off-by: Ben Blum \u003cbblum@google.com\u003e\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nReviewed-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: Ingo Molnar \u003cmingo@elte.hu\u003e\nCc: Dave Young \u003chidave.darkstar@gmail.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "c378369d8b4fa516ff2b1e79c3eded4e0e955ebb", "tree": "33dff6fa14c5b70cf25368b1bde57e5610a308b3", "parents": [ "d1d9fd3308fdef6b4bf564fa3d6cfe35b68b50bc" ], "author": { "name": "Ben Blum", "email": "bblum@google.com", "time": "Wed Sep 23 15:56:29 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:20:58 2009 -0700" }, "message": "cgroups: change css_set freeing mechanism to be under RCU\n\nChanges css_set freeing mechanism to be under RCU\n\nThis is a prepatch for making the procs file writable. In order to free the\nold css_sets for each task to be moved as they\u0027re being moved, the freeing\nmechanism must be RCU-protected, or else we would have to have a call to\nsynchronize_rcu() for each task before freeing its old css_set.\n\nSigned-off-by: Ben Blum \u003cbblum@google.com\u003e\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nCc: \"Paul E. McKenney\" \u003cpaulmck@us.ibm.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "72a8cb30d10d4041c455a7054607a7d519167c87", "tree": "9b499f9c7f4de011ba5c8282df0b2280b7c21f0b", "parents": [ "102a775e3647628727ae83a9a6abf0564c3ca7cb" ], "author": { "name": "Ben Blum", "email": "bblum@google.com", "time": "Wed Sep 23 15:56:27 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:20:58 2009 -0700" }, "message": "cgroups: ensure correct concurrent opening/reading of pidlists across pid namespaces\n\nPreviously there was the problem in which two processes from different pid\nnamespaces reading the tasks or procs file could result in one process\nseeing results from the other\u0027s namespace. Rather than one pidlist for\neach file in a cgroup, we now keep a list of pidlists keyed by namespace\nand file type (tasks versus procs) in which entries are placed on demand.\nEach pidlist has its own lock, and that the pidlists themselves are passed\naround in the seq_file\u0027s private pointer means we don\u0027t have to touch the\ncgroup or its master list except when creating and destroying entries.\n\nSigned-off-by: Ben Blum \u003cbblum@google.com\u003e\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "102a775e3647628727ae83a9a6abf0564c3ca7cb", "tree": "77a3d9717daa0f1dceccc0dcdf821aa12e684e07", "parents": [ "8f3ff20862cfcb85500a2bb55ee64622bd59fd0c" ], "author": { "name": "Ben Blum", "email": "bblum@google.com", "time": "Wed Sep 23 15:56:26 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:20:58 2009 -0700" }, "message": "cgroups: add a read-only \"procs\" file similar to \"tasks\" that shows only unique tgids\n\nstruct cgroup used to have a bunch of fields for keeping track of the\npidlist for the tasks file. Those are now separated into a new struct\ncgroup_pidlist, of which two are had, one for procs and one for tasks.\nThe way the seq_file operations are set up is changed so that just the\npidlist struct gets passed around as the private data.\n\nInterface example: Suppose a multithreaded process has pid 1000 and other\nthreads with ids 1001, 1002, 1003:\n$ cat tasks\n1000\n1001\n1002\n1003\n$ cat cgroup.procs\n1000\n$\n\nSigned-off-by: Ben Blum \u003cbblum@google.com\u003e\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "8f3ff20862cfcb85500a2bb55ee64622bd59fd0c", "tree": "ccf408f52ee23b1c0130520a84c21bbd8f4077e7", "parents": [ "2c6ab6d200827e1c41dc71fff3a2ac7473f51777" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Wed Sep 23 15:56:25 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Sep 24 07:20:58 2009 -0700" }, "message": "cgroups: revert \"cgroups: fix pid namespace bug\"\n\nThe following series adds a \"cgroup.procs\" file to each cgroup that\nreports unique tgids rather than pids, and allows all threads in a\nthreadgroup to be atomically moved to a new cgroup.\n\nThe subsystem \"attach\" interface is modified to support attaching whole\nthreadgroups at a time, which could introduce potential problems if any\nsubsystem were to need to access the old cgroup of every thread being\nmoved. The attach interface may need to be revised if this becomes the\ncase.\n\nAlso added is functionality for read/write locking all CLONE_THREAD\nfork()ing within a threadgroup, by means of an rwsem that lives in the\nsighand_struct, for per-threadgroup-ness and also for sharing a cacheline\nwith the sighand\u0027s atomic count. This scheme should introduce no extra\noverhead in the fork path when there\u0027s no contention.\n\nThe final patch reveals potential for a race when forking before a\nsubsystem\u0027s attach function is called - one potential solution in case any\nsubsystem has this problem is to hang on to the group\u0027s fork mutex through\nthe attach() calls, though no subsystem yet demonstrates need for an\nextended critical section.\n\nThis patch:\n\nRevert\n\ncommit 096b7fe012d66ed55e98bc8022405ede0cc80e96\nAuthor: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAuthorDate: Wed Jul 29 15:04:04 2009 -0700\nCommit: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nCommitDate: Wed Jul 29 19:10:35 2009 -0700\n\n cgroups: fix pid namespace bug\n\nThis is in preparation for some clashing cgroups changes that subsume the\noriginal commit\u0027s functionaliy.\n\nThe original commit fixed a pid namespace bug which Ben Blum fixed\nindependently (in the same way, but with different code) as part of a\nseries of patches. I played around with trying to reconcile Ben\u0027s patch\nseries with Li\u0027s patch, but concluded that it was simpler to just revert\nLi\u0027s, given that Ben\u0027s patch series contained essentially the same fix.\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "887032670d47366a8c8f25396ea7c14b7b2cc620", "tree": "e5f9ece5ab9239648e8d7051ccb9a217d92553d7", "parents": [ "f0d83679a8d471dc8b646919f70595d6fe8c9606" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Wed Jul 29 15:04:06 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Jul 29 19:10:35 2009 -0700" }, "message": "cgroup avoid permanent sleep at rmdir\n\nAfter commit ec64f51545fffbc4cb968f0cea56341a4b07e85a (\"cgroup: fix\nfrequent -EBUSY at rmdir\"), cgroup\u0027s rmdir (especially against memcg)\ndoesn\u0027t return -EBUSY by temporary ref counts. That commit expects all\nrefs after pre_destroy() is temporary but...it wasn\u0027t. Then, rmdir can\nwait permanently. This patch tries to fix that and change followings.\n\n - set CGRP_WAIT_ON_RMDIR flag before pre_destroy().\n - clear CGRP_WAIT_ON_RMDIR flag when the subsys finds racy case.\n if there are sleeping ones, wakes them up.\n - rmdir() sleeps only when CGRP_WAIT_ON_RMDIR flag is set.\n\nTested-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nReported-by: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nReviewed-by: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Balbir Sigh \u003cbalbir@linux.vnet.ibm.com\u003e\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "096b7fe012d66ed55e98bc8022405ede0cc80e96", "tree": "755709b6d3ff21a9e9640d6c19432b31c863ad34", "parents": [ "b317c833211b7fbf902163de766f09554090e0bf" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Jul 29 15:04:04 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Jul 29 19:10:35 2009 -0700" }, "message": "cgroups: fix pid namespace bug\n\nThe bug was introduced by commit cc31edceee04a7b87f2be48f9489ebb72d264844\n(\"cgroups: convert tasks file to use a seq_file with shared pid array\").\n\nWe cache a pid array for all threads that are opening the same \"tasks\"\nfile, but the pids in the array are always from the namespace of the\nlast process that opened the file, so all other threads will read pids\nfrom that namespace instead of their own namespaces.\n\nTo fix it, we maintain a list of pid arrays, which is keyed by pid_ns.\nThe list will be of length 1 at most time.\n\nReported-by: Paul Menage \u003cmenage@google.com\u003e\nIdea-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nReviewed-by: Serge Hallyn \u003cserue@us.ibm.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "811158b147a503fbdf9773224004ffd32002d1fe", "tree": "0a11dcfefe721bfc38ea9f1f4a238822dbae0dda", "parents": [ "4e76c5ccd5ac9bd003467d3bb0f49b18572dd4cd", "b26e0ed4936b743b693a4cc1413561fa3e4eaf65" ], "author": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Apr 03 15:24:35 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Apr 03 15:24:35 2009 -0700" }, "message": "Merge branch \u0027for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial\n\n* \u0027for-linus\u0027 of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (28 commits)\n trivial: Update my email address\n trivial: NULL noise: drivers/mtd/tests/mtd_*test.c\n trivial: NULL noise: drivers/media/dvb/frontends/drx397xD_fw.h\n trivial: Fix misspelling of \"Celsius\".\n trivial: remove unused variable \u0027path\u0027 in alloc_file()\n trivial: fix a pdlfush -\u003e pdflush typo in comment\n trivial: jbd header comment typo fix for JBD_PARANOID_IOFAIL\n trivial: wusb: Storage class should be before const qualifier\n trivial: drivers/char/bsr.c: Storage class should be before const qualifier\n trivial: h8300: Storage class should be before const qualifier\n trivial: fix where cgroup documentation is not correctly referred to\n trivial: Give the right path in Documentation example\n trivial: MTD: remove EOL from MODULE_DESCRIPTION\n trivial: Fix typo in bio_split()\u0027s documentation\n trivial: PWM: fix of #endif comment\n trivial: fix typos/grammar errors in Kconfig texts\n trivial: Fix misspelling of firmware\n trivial: cgroups: documentation typo and spelling corrections\n trivial: Update contact info for Jochen Hein\n trivial: fix typo \"resgister\" -\u003e \"register\"\n ...\n" }, { "commit": "bd1a8ab73edd449fecda633449cc277b856ad4f5", "tree": "66095c2a59f8706138e89190ec6c1d9cfaab6916", "parents": [ "0b4217b3fdddc4a58939720d3ed809537577d48b" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Thu Apr 02 16:57:50 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:56 2009 -0700" }, "message": "cgroups: add \u0027data\u0027 field to struct cgroup_scanner\n\nWe need to pass some data to test_task() or process_task() in some cases.\nWill be used later.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "0b7f569e45bb6be142d87017030669a6a7d327a1", "tree": "8df7877b95c093ebf4cb4e1006cea16f75fc79b7", "parents": [ "81d39c20f5ee2437d71709beb82597e2a38efbbc" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Apr 02 16:57:38 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:55 2009 -0700" }, "message": "memcg: fix OOM killer under memcg\n\nThis patch tries to fix OOM Killer problems caused by hierarchy.\nNow, memcg itself has OOM KILL function (in oom_kill.c) and tries to\nkill a task in memcg.\n\nBut, when hierarchy is used, it\u0027s broken and correct task cannot\nbe killed. For example, in following cgroup\n\n\t/groupA/\thierarchy\u003d1, limit\u003d1G,\n\t\t01\tnolimit\n\t\t02\tnolimit\nAll tasks\u0027 memory usage under /groupA, /groupA/01, groupA/02 is limited to\ngroupA\u0027s 1Gbytes but OOM Killer just kills tasks in groupA.\n\nThis patch provides makes the bad process be selected from all tasks\nunder hierarchy. BTW, currently, oom_jiffies is updated against groupA\nin above case. oom_jiffies of tree should be updated.\n\nTo see how oom_jiffies is used, please check mem_cgroup_oom_called()\ncallers.\n\n[akpm@linux-foundation.org: build fix]\n[akpm@linux-foundation.org: const fix]\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "099fca3225b39f7a3ed853036038054172b55581", "tree": "c7a8863f9ca8a5c745297e9ee43b63494b6022d1", "parents": [ "b6719ec1ad54e47e40633b19703f2c1254708842" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Thu Apr 02 16:57:29 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:54 2009 -0700" }, "message": "cgroups: show correct file mode\n\nWe have some read-only files and write-only files, but currently they are\nall set to 0644, which is counter-intuitive and cause trouble for some\ncgroup tools like libcgroup.\n\nThis patch adds \u0027mode\u0027 to struct cftype to allow cgroup subsys to set it\u0027s\nown files\u0027 file mode, and for the most cases cft-\u003emode can be default to 0\nand cgroup will figure out proper mode.\n\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nReviewed-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "ec64f51545fffbc4cb968f0cea56341a4b07e85a", "tree": "575d890a6759d81f3324fa2a22ca6ab14a41eefc", "parents": [ "38460b48d06440de46b34cb778bd6c4855030754" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Apr 02 16:57:26 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:54 2009 -0700" }, "message": "cgroup: fix frequent -EBUSY at rmdir\n\nIn following situation, with memory subsystem,\n\n\t/groupA use_hierarchy\u003d\u003d1\n\t\t/01 some tasks\n\t\t/02 some tasks\n\t\t/03 some tasks\n\t\t/04 empty\n\nWhen tasks under 01/02/03 hit limit on /groupA, hierarchical reclaim\nis triggered and the kernel walks tree under groupA. In this case,\nrmdir /groupA/04 fails with -EBUSY frequently because of temporal\nrefcnt from the kernel.\n\nIn general. cgroup can be rmdir\u0027d if there are no children groups and\nno tasks. Frequent fails of rmdir() is not useful to users.\n(And the reason for -EBUSY is unknown to users.....in most cases)\n\nThis patch tries to modify above behavior, by\n\t- retries if css_refcnt is got by someone.\n\t- add \"return value\" to pre_destroy() and allows subsystem to\n\t say \"we\u0027re really busy!\"\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "38460b48d06440de46b34cb778bd6c4855030754", "tree": "8f3362a446b5b03879f715c3f7279e70842bcca9", "parents": [ "313e924c0852943e67335fad9d2608701f0dfe8e" ], "author": { "name": "KAMEZAWA Hiroyuki", "email": "kamezawa.hiroyu@jp.fujitsu.com", "time": "Thu Apr 02 16:57:25 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:53 2009 -0700" }, "message": "cgroup: CSS ID support\n\nPatch for Per-CSS(Cgroup Subsys State) ID and private hierarchy code.\n\nThis patch attaches unique ID to each css and provides following.\n\n - css_lookup(subsys, id)\n returns pointer to struct cgroup_subysys_state of id.\n - css_get_next(subsys, id, rootid, depth, foundid)\n returns the next css under \"root\" by scanning\n\nWhen cgroup_subsys-\u003euse_id is set, an id for css is maintained.\n\nThe cgroup framework only parepares\n\t- css_id of root css for subsys\n\t- id is automatically attached at creation of css.\n\t- id is *not* freed automatically. Because the cgroup framework\n\t don\u0027t know lifetime of cgroup_subsys_state.\n\t free_css_id() function is provided. This must be called by subsys.\n\nThere are several reasons to develop this.\n\t- Saving space .... For example, memcg\u0027s swap_cgroup is array of\n\t pointers to cgroup. But it is not necessary to be very fast.\n\t By replacing pointers(8bytes per ent) to ID (2byes per ent), we can\n\t reduce much amount of memory usage.\n\n\t- Scanning without lock.\n\t CSS_ID provides \"scan id under this ROOT\" function. By this, scanning\n\t css under root can be written without locks.\n\t ex)\n\t do {\n\t\trcu_read_lock();\n\t\tnext \u003d cgroup_get_next(subsys, id, root, \u0026found);\n\t\t/* check sanity of next here */\n\t\tcss_tryget();\n\t\trcu_read_unlock();\n\t\tid \u003d found + 1\n\t } while(...)\n\nCharacteristics:\n\t- Each css has unique ID under subsys.\n\t- Lifetime of ID is controlled by subsys.\n\t- css ID contains \"ID\" and \"Depth in hierarchy\" and stack of hierarchy\n\t- Allowed ID is 1-65535, ID 0 is UNUSED ID.\n\nDesign Choices:\n\t- scan-by-ID v.s. scan-by-tree-walk.\n\t As /proc\u0027s pid scan does, scan-by-ID is robust when scanning is done\n\t by following kind of routine.\n\t scan -\u003e rest a while(release a lock) -\u003e conitunue from interrupted\n\t memcg\u0027s hierarchical reclaim does this.\n\n\t- When subsys-\u003euse_id is set, # of css in the system is limited to\n\t 65535.\n\n[bharata@linux.vnet.ibm.com: remove rcu_read_lock() from css_get_next()]\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nSigned-off-by: Bharata B Rao \u003cbharata@linux.vnet.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "313e924c0852943e67335fad9d2608701f0dfe8e", "tree": "fa4c3f65a7ed6edea52ae78b012138ebab1420c3", "parents": [ "d20a390a0ee2bf2f692c539c6ce1c829e1080bb5" ], "author": { "name": "Grzegorz Nosek", "email": "root@localdomain.pl", "time": "Thu Apr 02 16:57:23 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:53 2009 -0700" }, "message": "cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups\n\nThe ns_proxy cgroup allows moving processes to child cgroups only one\nlevel deep at a time. This commit relaxes this restriction and makes it\npossible to attach tasks directly to grandchild cgroups, e.g.:\n\n($pid is in the root cgroup)\necho $pid \u003e /cgroup/CG1/CG2/tasks\n\nPreviously this operation would fail with -EPERM and would have to be\nperformed as two steps:\necho $pid \u003e /cgroup/CG1/tasks\necho $pid \u003e /cgroup/CG1/CG2/tasks\n\nAlso, the target cgroup no longer needs to be empty to move a task there.\n\nSigned-off-by: Grzegorz Nosek \u003croot@localdomain.pl\u003e\nAcked-by: Serge Hallyn \u003cserue@us.ibm.com\u003e\nReviewed-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "d20a390a0ee2bf2f692c539c6ce1c829e1080bb5", "tree": "50fc49556959daf7da2f7194e8f5d02b2e52e3d8", "parents": [ "45dad7bd9d9b65a30d6e790b111f6f2d8f746d22" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Thu Apr 02 16:57:22 2009 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Apr 02 19:04:53 2009 -0700" }, "message": "cgroups: fix cgroup.h comments\n\nFix the style of some multi-line comments in cgroup.h to match\nDocumentation/CodingStyle\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "21acb9caa2e30b100e9a1943d995bb99d40f4035", "tree": "0c09bde664cb75b0b5e27745628ab458e2472f60", "parents": [ "6d5e147dd034d9ceedc89fe39f4284700944f0c8" ], "author": { "name": "Thadeu Lima de Souza Cascardo", "email": "cascardo@holoscopio.com", "time": "Wed Feb 04 10:12:08 2009 +0100" }, "committer": { "name": "Jiri Kosina", "email": "jkosina@suse.cz", "time": "Mon Mar 30 15:22:02 2009 +0200" }, "message": "trivial: fix where cgroup documentation is not correctly referred to\n\ncgroup documentation was moved to Documentation/cgroups/. There are some\nplaces that still refer to Documentation/controllers/,\nDocumentation/cgroups.txt and Documentation/cpusets.txt. Fix those.\n\nSigned-off-by: Thadeu Lima de Souza Cascardo \u003ccascardo@holoscopio.com\u003e\nReviewed-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Jiri Kosina \u003cjkosina@suse.cz\u003e\n" }, { "commit": "cfebe563bd0a3ff97e1bc167123120d59c7a84db", "tree": "6178bf45bcccaf3d43d87cfe0eef059d849c7140", "parents": [ "01c4a4283137d24c9cc3785f1f312e895a18f273" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Feb 11 13:04:36 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Feb 11 14:25:36 2009 -0800" }, "message": "cgroups: fix lockdep subclasses overflow\n\nI enabled all cgroup subsystems when compiling kernel, and then:\n # mount -t cgroup -o net_cls xxx /mnt\n # mkdir /mnt/0\n\nThis showed up immediately:\n BUG: MAX_LOCKDEP_SUBCLASSES too low!\n turning off the locking correctness validator.\n\nIt\u0027s caused by the cgroup hierarchy lock:\n\tfor (i \u003d 0; i \u003c CGROUP_SUBSYS_COUNT; i++) {\n\t\tstruct cgroup_subsys *ss \u003d subsys[i];\n\t\tif (ss-\u003eroot \u003d\u003d root)\n\t\t\tmutex_lock_nested(\u0026ss-\u003ehierarchy_mutex, i);\n\t}\n\nNow we have 9 cgroup subsystems, and the above \u0027i\u0027 for net_cls is 8, but\nMAX_LOCKDEP_SUBCLASSES is 8.\n\nThis patch uses different lockdep keys for different subsystems.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "804b3c28a4e4fa1c224571bf76edb534b9c4b1ed", "tree": "59e0dabb227a5067cfdc7cce13f149f141ef8cb4", "parents": [ "1404f06565ee89e0ce04d4a5859c00b0e3a0dc8d" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Thu Jan 29 14:25:21 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 29 18:04:45 2009 -0800" }, "message": "cgroups: add cpu_relax() calls in css_tryget() and cgroup_clear_css_refs()\n\ncss_tryget() and cgroup_clear_css_refs() contain polling loops; these\nloops should have cpu_relax calls in them to reduce cross-cache traffic.\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e7c5ec9193d32b9559a3bb8893ceedbda85201ff", "tree": "fd7505c03e2c7525a110a702907c0604c233e2d9", "parents": [ "2cb378c862777d050c20db903b119a029845fdcb" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Wed Jan 07 18:08:38 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 08 08:31:10 2009 -0800" }, "message": "cgroups: add css_tryget()\n\nAdd css_tryget(), that obtains a counted reference on a CSS. It is used\nin situations where the caller has a \"weak\" reference to the CSS, i.e.\none that does not protect the cgroup from removal via a reference count,\nbut would instead be cleaned up by a destroy() callback.\n\ncss_tryget() will return true on success, or false if the cgroup is being\nremoved.\n\nThis is similar to Kamezawa Hiroyuki\u0027s patch from a week or two ago, but\nwith the difference that in the event of css_tryget() racing with a\ncgroup_rmdir(), css_tryget() will only return false if the cgroup really\ndoes get removed.\n\nThis implementation is done by biasing css-\u003erefcnt, so that a refcnt of 1\nmeans \"releasable\" and 0 means \"released or releasing\". In the event of a\nrace, css_tryget() distinguishes between \"released\" and \"releasing\" by\nchecking for the CSS_REMOVED flag in css-\u003eflags.\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nTested-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "999cd8a450f8f93701669a61cac4d3b19eca07e8", "tree": "990e5b08e6db971d2e9943f89abf39e7c8f4cb1e", "parents": [ "b5a84319a4343a0db753436fd8147e61eaafa7ea" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Wed Jan 07 18:08:36 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 08 08:31:10 2009 -0800" }, "message": "cgroups: add a per-subsystem hierarchy_mutex\n\nThese patches introduce new locking/refcount support for cgroups to\nreduce the need for subsystems to call cgroup_lock(). This will\nultimately allow the atomicity of cgroup_rmdir() (which was removed\nrecently) to be restored.\n\nThese three patches give:\n\n1/3 - introduce a per-subsystem hierarchy_mutex which a subsystem can\n use to prevent changes to its own cgroup tree\n\n2/3 - use hierarchy_mutex in place of calling cgroup_lock() in the\n memory controller\n\n3/3 - introduce a css_tryget() function similar to the one recently\n proposed by Kamezawa, but avoiding spurious refcount failures in\n the event of a race between a css_tryget() and an unsuccessful\n cgroup_rmdir()\n\nFuture patches will likely involve:\n\n- using hierarchy mutex in place of cgroup_lock() in more subsystems\n where appropriate\n\n- restoring the atomicity of cgroup_rmdir() with respect to cgroup_create()\n\nThis patch:\n\nAdd a hierarchy_mutex to the cgroup_subsys object that protects changes to\nthe hierarchy observed by that subsystem. It is taken by the cgroup\nsubsystem (in addition to cgroup_mutex) for the following operations:\n\n- linking a cgroup into that subsystem\u0027s cgroup tree\n- unlinking a cgroup from that subsystem\u0027s cgroup tree\n- moving the subsystem to/from a hierarchy (including across the\n bind() callback)\n\nThus if the subsystem holds its own hierarchy_mutex, it can safely\ntraverse its own hierarchy.\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nTested-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "a47295e6bc42ad35f9c15ac66f598aa24debd4e2", "tree": "cb765e996ef35ae88e29d60796655d0d35e8cf5e", "parents": [ "e7b80bb695a5b64c92e314838e083b2f3bdf29b2" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Wed Jan 07 18:07:44 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 08 08:31:03 2009 -0800" }, "message": "cgroups: make cgroup_path() RCU-safe\n\nFix races between /proc/sched_debug by freeing cgroup objects via an RCU\ncallback. Thus any cgroup reference obtained from an RCU-safe source will\nremain valid during the RCU section. Since dentries are also RCU-safe,\nthis allows us to traverse up the tree safely.\n\nAdditionally, make cgroup_path() check for a NULL cgrp-\u003edentry to avoid\ntrying to report a path for a partially-created cgroup.\n\n[lizf@cn.fujitsu.com: call deactive_super() in cgroup_diput()]\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nReviewed-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nTested-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "b2aa30f7bb381e04c93eed106089ba55553955f1", "tree": "eda632102a0bc6e325a24e77a9c2819eab5aeef3", "parents": [ "2019f634ce5904c19eba4e86f51b1a119a53a9f1" ], "author": { "name": "Lai Jiangshan", "email": "laijs@cn.fujitsu.com", "time": "Wed Jan 07 18:07:37 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Jan 08 08:31:02 2009 -0800" }, "message": "cgroups: don\u0027t put struct cgroupfs_root protected by RCU\n\nWe don\u0027t access struct cgroupfs_root in fast path, so we should not put\nstruct cgroupfs_root protected by RCU\n\nBut the comment in struct cgroup_subsys.root confuse us.\n\nstruct cgroup_subsys.root is used in these places:\n\n1 find_css_set(): if (ss-\u003eroot-\u003esubsys_list.next \u003d\u003d \u0026ss-\u003esibling)\n2 rebind_subsystems(): if (ss-\u003eroot !\u003d \u0026rootnode)\n rcu_assign_pointer(ss-\u003eroot, root);\n rcu_assign_pointer(subsys[i]-\u003eroot, \u0026rootnode);\n3 cgroup_has_css_refs(): if (ss-\u003eroot !\u003d cgrp-\u003eroot)\n4 cgroup_init_subsys(): ss-\u003eroot \u003d \u0026rootnode;\n5 proc_cgroupstats_show(): ss-\u003ename, ss-\u003eroot-\u003esubsys_bits,\n ss-\u003eroot-\u003enumber_of_cgroups, !ss-\u003edisabled);\n6 cgroup_clone(): root \u003d subsys-\u003eroot;\n if ((root !\u003d subsys-\u003eroot) ||\n\nAll these place we have held cgroup_lock() or we don\u0027t dereference to\nstruct cgroupfs_root. It\u0027s means wo don\u0027t need RCU when use struct\ncgroup_subsys.root, and we should not put struct cgroupfs_root protected\nby RCU.\n\nSigned-off-by: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nReviewed-by: Paul Menage \u003cmenage@google.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Pavel Emelyanov \u003cxemul@openvz.org\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e5991371ee0d1c0ce19e133c6f9075b49c5b4ae8", "tree": "3e5c9c3293c025f537ff4416660a96d33c694b5f", "parents": [ "39f0dee2d8abe902617622b71f8f6f73985ec71c" ], "author": { "name": "Hugh Dickins", "email": "hugh@veritas.com", "time": "Tue Jan 06 14:39:22 2009 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Tue Jan 06 15:59:01 2009 -0800" }, "message": "mm: remove cgroup_mm_owner_callbacks\n\ncgroup_mm_owner_callbacks() was brought in to support the memrlimit\ncontroller, but sneaked into mainline ahead of it. That controller has\nnow been shelved, and the mm_owner_changed() args were inadequate for it\nanyway (they needed an mm pointer instead of a task pointer).\n\nRemove the dead code, and restore mm_update_next_owner() locking to how it\nwas before: taking mmap_sem there does nothing for memcontrol.c, now the\nonly user of mm-\u003eowner.\n\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "9b913735e53ab0da4a792bac0de8e178cc13dcfb", "tree": "8ecc6e20f99379674b1977631a31e6d33de43174", "parents": [ "51308ee59dee1136ed599d875ea8968d7be55c91" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Oct 29 14:00:54 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 30 11:38:45 2008 -0700" }, "message": "cgroups: tiny cleanups\n\n- remove \u0027private\u0027 field from struct subsys\n- remove cgroup_init_smp()\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "886465f407e57d6c3c81013c919ea670ce1ae0d0", "tree": "c8981531dee58b1fc19a383068d6770c030bd534", "parents": [ "cc31edceee04a7b87f2be48f9489ebb72d264844" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Sat Oct 18 20:28:05 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:38 2008 -0700" }, "message": "cgroups: fix declaration of cgroup_mm_owner_callbacks\n\nThe choice of real/dummy declaration for cgroup_mm_owner_callbacks()\nshouldn\u0027t be based on CONFIG_MM_OWNER, but on CONFIG_CGROUPS. Otherwise\nkernel/exit.c fails to compile when something other than a cgroups\ncontroller selects CONFIG_MM_OWNER\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nAcked-by: Pekka Enberg \u003cpenberg@cs.helsinki.fi\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "cc31edceee04a7b87f2be48f9489ebb72d264844", "tree": "5d37791218c420281e509899645d89aee7902f2b", "parents": [ "146aa1bd0511f88ddb4e92fafa2b8aad4f2f65f3" ], "author": { "name": "Paul Menage", "email": "menage@google.com", "time": "Sat Oct 18 20:28:04 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:38 2008 -0700" }, "message": "cgroups: convert tasks file to use a seq_file with shared pid array\n\nRather than pre-generating the entire text for the \"tasks\" file each\ntime the file is opened, we instead just generate/update the array of\nprocess ids and use a seq_file to report these to userspace. All open\nfile handles on the same \"tasks\" file can share a pid array, which may\nbe updated any time that no thread is actively reading the array. By\nsharing the array, the potential for userspace to DoS the system by\nopening many handles on the same \"tasks\" file is removed.\n\n[Based on a patch by Lai Jiangshan, extended to use seq_file]\n\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nReviewed-by: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nCc: Serge Hallyn \u003cserue@us.ibm.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "146aa1bd0511f88ddb4e92fafa2b8aad4f2f65f3", "tree": "d7deb46b9a38f82f109b2126317899efbbce41c2", "parents": [ "248736c2a57206388c86f8cdd3392ee986e84f9f" ], "author": { "name": "Lai Jiangshan", "email": "laijs@cn.fujitsu.com", "time": "Sat Oct 18 20:28:03 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:38 2008 -0700" }, "message": "cgroups: fix probable race with put_css_set[_taskexit] and find_css_set\n\nput_css_set_taskexit may be called when find_css_set is called on other\ncpu. And the race will occur:\n\nput_css_set_taskexit side find_css_set side\n\n |\natomic_dec_and_test(\u0026kref-\u003erefcount) |\n /* kref-\u003erefcount \u003d 0 */ |\n....................................................................\n | read_lock(\u0026css_set_lock)\n | find_existing_css_set\n | get_css_set\n | read_unlock(\u0026css_set_lock);\n....................................................................\n__release_css_set |\n....................................................................\n | /* use a released css_set */\n |\n\n[put_css_set is the same. But in the current code, all put_css_set are\nput into cgroup mutex critical region as the same as find_css_set.]\n\n[akpm@linux-foundation.org: repair comments]\n[menage@google.com: eliminate race in css_set refcounting]\nSigned-off-by: Lai Jiangshan \u003claijs@cn.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Paul Menage \u003cmenage@google.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "9363b9f23c9cc36cc8ef6c05fdf879ee4a96ae92", "tree": "482746b06d6fdd8be606de4dff584a3a40054c4c", "parents": [ "1648993fb05c487947c1cec6307aca29d8002abe" ], "author": { "name": "Balbir Singh", "email": "balbir@linux.vnet.ibm.com", "time": "Wed Oct 15 22:01:05 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 16 11:21:28 2008 -0700" }, "message": "memrlimit: cgroup mm owner callback changes to add task info\n\nThis patch adds an additional field to the mm_owner callbacks. This field\nis required to get to the mm that changed. Hold mmap_sem in write mode\nbefore calling the mm_owner_changed callback\n\n[hugh@veritas.com: fix mmap_sem deadlock]\nSigned-off-by: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Sudhir Kumar \u003cskumar@linux.vnet.ibm.com\u003e\nCc: YAMAMOTO Takashi \u003cyamamoto@valinux.co.jp\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Pavel Emelianov \u003cxemul@openvz.org\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Vivek Goyal \u003cvgoyal@redhat.com\u003e\nSigned-off-by: Hugh Dickins \u003chugh@veritas.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" }, { "commit": "e885dcde75685e09f23cffae1f6d5169c105b8a0", "tree": "711a91e83fad632c194700839d3e47631aee677a", "parents": [ "856c13aa1ff6136c1968414fdea5938ea9d5ebf2" ], "author": { "name": "Serge E. Hallyn", "email": "serue@us.ibm.com", "time": "Fri Jul 25 01:47:06 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Fri Jul 25 10:53:37 2008 -0700" }, "message": "cgroup_clone: use pid of newly created task for new cgroup\n\ncgroup_clone creates a new cgroup with the pid of the task. This works\ncorrectly for unshare, but for clone cgroup_clone is called from\ncopy_namespaces inside copy_process, which happens before the new pid is\ncreated. As a result, the new cgroup was created with current\u0027s pid.\nThis patch:\n\n\t1. Moves the call inside copy_process to after the new pid\n\t is created\n\t2. Passes the struct pid into ns_cgroup_clone (as it is not\n\t yet attached to the task)\n\t3. Passes a name from ns_cgroup_clone() into cgroup_clone()\n\t so as to keep cgroup_clone() itself simpler\n\t4. Uses pid_vnr() to get the process id value, so that the\n\t pid used to name the new cgroup is always the pid as it\n\t would be known to the task which did the cloning or\n\t unsharing. I think that is the most intuitive thing to\n\t do. This way, task t1 does clone(CLONE_NEWPID) to get\n\t t2, which does clone(CLONE_NEWPID) to get t3, then the\n\t cgroup for t3 will be named for the pid by which t2 knows\n\t t3.\n\n(Thanks to Dan Smith for finding the main bug)\n\nChangelog:\n\tJune 11: Incorporate Paul Menage\u0027s feedback: don\u0027t pass\n\t NULL to ns_cgroup_clone from unshare, and reduce\n\t\t patch size by using \u0027nodename\u0027 in cgroup_clone.\n\tJune 10: Original version\n\n[akpm@linux-foundation.org: build fix]\n[akpm@linux-foundation.org: coding-style fixes]\nSigned-off-by: Serge Hallyn \u003cserge@us.ibm.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nTested-by: Dan Smith \u003cdanms@us.ibm.com\u003e\nCc: Balbir Singh \u003cbalbir@in.ibm.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n" } ], "next": "84eea842886ac35020be6043e04748ed22014359" }