)]}' { "log": [ { "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": "2d3cbf8bc852ac1bc3d098186143c5973f87b753", "tree": "5507f0efa192ac6df884fb0118bfd0e28d758662", "parents": [ "0bdba580ab052a21e3eda2764ed22d9ee962392b" ], "author": { "name": "Tomasz Buchert", "email": "tomasz.buchert@inria.fr", "time": "Wed Oct 27 15:33:34 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Oct 27 18:03:08 2010 -0700" }, "message": "cgroup_freezer: update_freezer_state() does incorrect state transitions\n\nThere are 4 state transitions possible for a freezer. Only FREEZING -\u003e\nFROZEN transaction is done lazily. This patch allows update_freezer_state\nonly to perform this transaction and renames the function to\nupdate_if_frozen.\n\nMoreover is_task_frozen_enough function is removed and its every occurence\nis replaced with frozen(). Therefore for a group to become FROZEN every\ntask must be frozen.\n\nThe previous version could trigger a following bug: When cgroup is in the\nprocess of freezing (but none of its tasks are frozen yet),\nupdate_freezer_state() (called from freezer_read or freezer_write) would\nincorrectly report that a group is \u0027THAWED\u0027 (because nfrozen \u003d 0),\nallowing the transaction FREEZING -\u003e THAWED without writing anything to\n\u0027freezer.state\u0027. This is incorrect according to the documentation. This\ncould result in a \u0027THAWED\u0027 cgroup with frozen tasks inside.\n\nA code to reproduce this bug is available here:\nhttp://pentium.hopto.org/~thinred/repos/linux-misc/freezer_bug2.c\n\n[akpm@linux-foundation.org: coding-style fixes]\nSigned-off-by: Tomasz Buchert \u003ctomasz.buchert@inria.fr\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\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": "0bdba580ab052a21e3eda2764ed22d9ee962392b", "tree": "9d8fb958c8612a9c72b8662d9b51c12c76ccd0bb", "parents": [ "d5de4ddb1bc430289bede76c0d87cabee93f749a" ], "author": { "name": "Tomasz Buchert", "email": "tomasz.buchert@inria.fr", "time": "Wed Oct 27 15:33:33 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Oct 27 18:03:08 2010 -0700" }, "message": "cgroup_freezer: fix can_attach() to prohibit moving from/to freezing/frozen cgroups\n\nIt is possible to move a task from its cgroup even if this group is\n\u0027FREEZING\u0027. This results in a nasty bug - the moved task will become\nfrozen OUTSIDE its original cgroup and will remain in a permanent \u0027D\u0027\nstate.\n\nThis patch allows to migrate the task only between THAWED cgroups.\n\nThis behavior was observed and easily reproduced on a single core laptop.\nNotice that reproducibility depends highly on the machine used. Program\nand instructions how to reproduce the bug can be fetched from:\nhttp://pentium.hopto.org/~thinred/repos/linux-misc/freezer_bug.c\n\nSigned-off-by: Tomasz Buchert \u003ctomasz.buchert@inria.fr\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\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": "d5de4ddb1bc430289bede76c0d87cabee93f749a", "tree": "142ebbc437d2d6e5c47eda6c37847eb058d2851e", "parents": [ "abffc0207f12563f17bbde96e4cc0d9f3d7e2a53" ], "author": { "name": "Tomasz Buchert", "email": "tomasz.buchert@inria.fr", "time": "Wed Oct 27 15:33:32 2010 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Oct 27 18:03:08 2010 -0700" }, "message": "cgroup_freezer: unnecessary test in cgroup_freezing_or_frozen()\n\nThe root freezer_state is always CGROUP_THAWED so we can remove the\nspecial case from the code. The test itself can be handy and is extracted\nto static function.\n\nSigned-off-by: Tomasz Buchert \u003ctomasz.buchert@inria.fr\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\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": "8f77578cc2debaeb30a4ef6206f4ba10944bdcd8", "tree": "796fdc066d523a9827a5aec0ae4276710fb8181b", "parents": [ "543f2503a956601dd490c6cde0ebf6adb4653e50" ], "author": { "name": "Matt Helsley", "email": "matthltc@us.ibm.com", "time": "Mon May 10 23:18:47 2010 +0200" }, "committer": { "name": "Rafael J. Wysocki", "email": "rjw@sisk.pl", "time": "Mon May 10 23:18:47 2010 +0200" }, "message": "Freezer / cgroup freezer: Update stale locking comments\n\nUpdate stale comments regarding locking order and add a little more detail\nso it\u0027s easier to follow the locking between the cgroup freezer and the\npower management freezer code.\n\nSigned-off-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\u003e\n" }, { "commit": "8b46f880841aac821af8efa6581bb0e46b8b9845", "tree": "4172415abf0f8cbbdd7367023cf521e7a56b9a3a", "parents": [ "8b08ca52f5942c21564bbb90ccfb61053f2c26a1" ], "author": { "name": "Paul E. McKenney", "email": "paulmck@linux.vnet.ibm.com", "time": "Wed Apr 21 13:02:08 2010 -0700" }, "committer": { "name": "Ingo Molnar", "email": "mingo@elte.hu", "time": "Fri Apr 30 12:03:17 2010 +0200" }, "message": "rcu: Fix RCU lockdep splat on freezer_fork path\n\nAdd an RCU read-side critical section to suppress this false\npositive.\n\nLocated-by: Eric Paris \u003ceparis@parisplace.org\u003e\nSigned-off-by: Paul E. McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.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\nCc: eric.dumazet@gmail.com\nLKML-Reference: \u003c1271880131-3951-2-git-send-email-paulmck@linux.vnet.ibm.com\u003e\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n" }, { "commit": "336f5899d287f06d8329e208fc14ce50f7ec9698", "tree": "9b762d450d5eb248a6ff8317badb7e223d93ed58", "parents": [ "a4ab2773205e8b94c18625455f85e3b6bb9d7ad6", "db217dece3003df0841bacf9556b5c06aa097dae" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Apr 05 11:37:28 2010 +0900" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Mon Apr 05 11:37:28 2010 +0900" }, "message": "Merge branch \u0027master\u0027 into export-slabh\n" }, { "commit": "5a0e3ad6af8660be21ca98a971cd00f331318c05", "tree": "5bfb7be11a03176a87296a43ac6647975c00a1d1", "parents": [ "ed391f4ebf8f701d3566423ce8f17e614cde9806" ], "author": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Wed Mar 24 17:04:11 2010 +0900" }, "committer": { "name": "Tejun Heo", "email": "tj@kernel.org", "time": "Tue Mar 30 22:02:32 2010 +0900" }, "message": "include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h\n\npercpu.h is included by sched.h and module.h and thus ends up being\nincluded when building most .c files. percpu.h includes slab.h which\nin turn includes gfp.h making everything defined by the two files\nuniversally available and complicating inclusion dependencies.\n\npercpu.h -\u003e slab.h dependency is about to be removed. Prepare for\nthis change by updating users of gfp and slab facilities include those\nheaders directly instead of assuming availability. As this conversion\nneeds to touch large number of source files, the following script is\nused as the basis of conversion.\n\n http://userweb.kernel.org/~tj/misc/slabh-sweep.py\n\nThe script does the followings.\n\n* Scan files for gfp and slab usages and update includes such that\n only the necessary includes are there. ie. if only gfp is used,\n gfp.h, if slab is used, slab.h.\n\n* When the script inserts a new include, it looks at the include\n blocks and try to put the new include such that its order conforms\n to its surrounding. It\u0027s put in the include block which contains\n core kernel includes, in the same order that the rest are ordered -\n alphabetical, Christmas tree, rev-Xmas-tree or at the end if there\n doesn\u0027t seem to be any matching order.\n\n* If the script can\u0027t find a place to put a new include (mostly\n because the file doesn\u0027t have fitting include block), it prints out\n an error message indicating which .h file needs to be added to the\n file.\n\nThe conversion was done in the following steps.\n\n1. The initial automatic conversion of all .c files updated slightly\n over 4000 files, deleting around 700 includes and adding ~480 gfp.h\n and ~3000 slab.h inclusions. The script emitted errors for ~400\n files.\n\n2. Each error was manually checked. Some didn\u0027t need the inclusion,\n some needed manual addition while adding it to implementation .h or\n embedding .c file was more appropriate for others. This step added\n inclusions to around 150 files.\n\n3. The script was run again and the output was compared to the edits\n from #2 to make sure no file was left behind.\n\n4. Several build tests were done and a couple of problems were fixed.\n e.g. lib/decompress_*.c used malloc/free() wrappers around slab\n APIs requiring slab.h to be added manually.\n\n5. The script was run on all .h files but without automatically\n editing them as sprinkling gfp.h and slab.h inclusions around .h\n files could easily lead to inclusion dependency hell. Most gfp.h\n inclusion directives were ignored as stuff from gfp.h was usually\n wildly available and often used in preprocessor macros. Each\n slab.h inclusion directive was examined and added manually as\n necessary.\n\n6. percpu.h was updated not to include slab.h.\n\n7. Build test were done on the following configurations and failures\n were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my\n distributed build env didn\u0027t work with gcov compiles) and a few\n more options had to be turned off depending on archs to make things\n build (like ipr on powerpc/64 which failed due to missing writeq).\n\n * x86 and x86_64 UP and SMP allmodconfig and a custom test config.\n * powerpc and powerpc64 SMP allmodconfig\n * sparc and sparc64 SMP allmodconfig\n * ia64 SMP allmodconfig\n * s390 SMP allmodconfig\n * alpha SMP allmodconfig\n * um on x86_64 SMP allmodconfig\n\n8. percpu.h modifications were reverted so that it could be applied as\n a separate patch and serve as bisection point.\n\nGiven the fact that I had only a couple of failures from tests on step\n6, I\u0027m fairly confident about the coverage of this conversion patch.\nIf there is a breakage, it\u0027s likely to be something in one of the arch\nheaders which should be easily discoverable easily on most builds of\nthe specific arch.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nGuess-its-ok-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: Ingo Molnar \u003cmingo@redhat.com\u003e\nCc: Lee Schermerhorn \u003cLee.Schermerhorn@hp.com\u003e\n" }, { "commit": "5a7aadfe2fcb0f69e2acc1fbefe22a096e792fc9", "tree": "dc1b649fc6aa05ecd25cab23e464894e660830d5", "parents": [ "4f598458ea4450f53e8ed929ee4e66b3404a7286" ], "author": { "name": "Matt Helsley", "email": "matthltc@us.ibm.com", "time": "Fri Mar 26 23:51:44 2010 +0100" }, "committer": { "name": "Rafael J. Wysocki", "email": "rjw@sisk.pl", "time": "Fri Mar 26 23:51:44 2010 +0100" }, "message": "Freezer: Fix buggy resume test for tasks frozen with cgroup freezer\n\nWhen the cgroup freezer is used to freeze tasks we do not want to thaw\nthose tasks during resume. Currently we test the cgroup freezer\nstate of the resuming tasks to see if the cgroup is FROZEN. If so\nthen we don\u0027t thaw the task. However, the FREEZING state also indicates\nthat the task should remain frozen.\n\nThis also avoids a problem pointed out by Oren Ladaan: the freezer state\ntransition from FREEZING to FROZEN is updated lazily when userspace reads\nor writes the freezer.state file in the cgroup filesystem. This means that\nresume will thaw tasks in cgroups which should be in the FROZEN state if\nthere is no read/write of the freezer.state file to trigger this\ntransition before suspend.\n\nNOTE: Another \"simple\" solution would be to always update the cgroup\nfreezer state during resume. However it\u0027s a bad choice for several reasons:\nUpdating the cgroup freezer state is somewhat expensive because it requires\nwalking all the tasks in the cgroup and checking if they are each frozen.\nWorse, this could easily make resume run in N^2 time where N is the number\nof tasks in the cgroup. Finally, updating the freezer state from this code\npath requires trickier locking because of the way locks must be ordered.\n\nInstead of updating the freezer state we rely on the fact that lazy\nupdates only manage the transition from FREEZING to FROZEN. We know that\na cgroup with the FREEZING state may actually be FROZEN so test for that\nstate too. This makes sense in the resume path even for partially-frozen\ncgroups -- those that really are FREEZING but not FROZEN.\n\nReported-by: Oren Ladaan \u003corenl@cs.columbia.edu\u003e\nSigned-off-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: stable@kernel.org\nSigned-off-by: Rafael J. Wysocki \u003crjw@sisk.pl\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": "3b1b3f6e57064aa8f91c290fe51cda4c74642902", "tree": "2cf60a7bae5f184acbea4bff859be4e4132f9794", "parents": [ "687446760bd008df96655cb8c5900f8e48a7118c" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Nov 12 13:26:50 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 12 17:17:16 2008 -0800" }, "message": "freezer_cg: disable writing freezer.state of root cgroup\n\nWith this change, control file \u0027freezer.state\u0027 doesn\u0027t exist in root\ncgroup, making root cgroup unfreezable.\n\nI think it\u0027s reasonable to disallow freeze tasks in the root cgroup. And\nthen we can avoid fork overhead when freezer subsystem is compiled but not\nused.\n\nAlso make writing invalid value to freezer.state returns EINVAL rather\nthan EIO. This is more consistent with other cgroup subsystem.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Paul Menage \u003cmenage@google.com\u003e\nCc: Cedric Le Goater \u003cclg@fr.ibm.com\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: \"Serge E. Hallyn\" \u003cserue@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": "687446760bd008df96655cb8c5900f8e48a7118c", "tree": "b4834a1e88d98234cfad90a0880b54ba1cc3cc59", "parents": [ "0bcb6069a6e1af5c114a2a8873ec43ada8933596" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Nov 12 13:26:49 2008 -0800" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Wed Nov 12 17:17:16 2008 -0800" }, "message": "freezer_cg: remove task_lock from freezer_fork()\n\nIn theory the task can be moved to another cgroup and the freezer will be\nfreed right after task_lock is dropped, so the lock results in zero\nprotection.\n\nBut in the case of freezer_fork() no lock is needed, since the task is not\nin tasklist yet so it won\u0027t be moved to another cgroup, so task-\u003ecgroups\nwon\u0027t be changed or invalidated.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: Cedric Le Goater \u003cclg@fr.ibm.com\u003e\nCc: \"Serge E. Hallyn\" \u003cserue@us.ibm.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": "51308ee59dee1136ed599d875ea8968d7be55c91", "tree": "8976509c5fbf8171774e7eb7007cf0d4d00f0f83", "parents": [ "00c2e63c31d0f431952ff2a671c5c6997dd4f8b2" ], "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": "freezer_cg: simplify freezer_change_state()\n\nJust call unfreeze_cgroup() if goal_state \u003d\u003d THAWED, and call\ntry_to_freeze_cgroup() if goal_state \u003d\u003d FROZEN.\n\nNo behavior has been changed.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Cedric Le Goater \u003cclg@fr.ibm.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": "00c2e63c31d0f431952ff2a671c5c6997dd4f8b2", "tree": "2277b400fef79e55c13d7045aa63d5bed9ad5883", "parents": [ "80a6a2cf3bebcf20285cf05373b9c5ec96816577" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Oct 29 14:00:53 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 30 11:38:45 2008 -0700" }, "message": "freezer_cg: use thaw_process() in unfreeze_cgroup()\n\nDon\u0027t duplicate the implementation of thaw_process().\n\n[akpm@linux-foundation.org: make __thaw_process() static]\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Cedric Le Goater \u003cclg@fr.ibm.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": "80a6a2cf3bebcf20285cf05373b9c5ec96816577", "tree": "b934c6b9c55e7f0979312bdec9f679680d73aac1", "parents": [ "7ccb97437bcc818d0ba6067513475f6ee8177a15" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Oct 29 14:00:52 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 30 11:38:45 2008 -0700" }, "message": "freezer_cg: remove redundant check in freezer_can_attach()\n\nIt is sufficient to check if @task is frozen, and no need to check if the\noriginal freezer is frozen.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Cedric Le Goater \u003cclg@fr.ibm.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": "7ccb97437bcc818d0ba6067513475f6ee8177a15", "tree": "5d9209002ea50383ffc256f89c25743552b5c637", "parents": [ "df8bc08c192f00f155185bfd6f052d46a728814a" ], "author": { "name": "Li Zefan", "email": "lizf@cn.fujitsu.com", "time": "Wed Oct 29 14:00:51 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Thu Oct 30 11:38:45 2008 -0700" }, "message": "freezer_cg: fix improper BUG_ON() causing oops\n\nThe BUG_ON() should be protected by freezer-\u003elock, otherwise it can be\ntriggered easily when a task has been unfreezed but the corresponding\ncgroup hasn\u0027t been changed to FROZEN state.\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Cedric Le Goater \u003cclg@fr.ibm.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": "1aece34833721d64eb33fc15cd923c727296d3d3", "tree": "7d50bac9229430528ff28aa362c87f745ebd1c78", "parents": [ "81dcf33c2ae314899f754aa7aaa1cb1fe2f84da6" ], "author": { "name": "Matt Helsley", "email": "matthltc@us.ibm.com", "time": "Sat Oct 18 20:27:24 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:34 2008 -0700" }, "message": "container freezer: rename check_if_frozen()\n\ncheck_if_frozen() sounds like it should return something when in fact it\u0027s\njust updating the freezer state.\n\nSigned-off-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": "81dcf33c2ae314899f754aa7aaa1cb1fe2f84da6", "tree": "8a4ef6206a3f70bf245c9f89baf5294e7ffd2d2f", "parents": [ "957a4eeaf4af614ab0fc4c09a22593d6ab233f5b" ], "author": { "name": "Matt Helsley", "email": "matthltc@us.ibm.com", "time": "Sat Oct 18 20:27:23 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:34 2008 -0700" }, "message": "container freezer: make freezer state names less generic\n\nRename cgroup freezer states to be less generic to avoid any name\ncollisions while also better describing what each state is.\n\nSigned-off-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": "957a4eeaf4af614ab0fc4c09a22593d6ab233f5b", "tree": "944d338890a2346ca1bd9cd78e01c659635bf085", "parents": [ "5a06915c6df9b89cda5ddb3f8cce5f9a6be534d2" ], "author": { "name": "Matt Helsley", "email": "matthltc@us.ibm.com", "time": "Sat Oct 18 20:27:22 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:34 2008 -0700" }, "message": "container freezer: prevent frozen tasks or cgroups from changing\n\nDon\u0027t let frozen tasks or cgroups change. This means frozen tasks can\u0027t\nleave their current cgroup for another cgroup. It also means that tasks\ncannot be added to or removed from a cgroup in the FROZEN state. We\nenforce these rules by checking for frozen tasks and cgroups in the\ncan_attach() function.\n\nSigned-off-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": "dc52ddc0e6f45b04780b26fc0813509f8e798c42", "tree": "384826e9fab4e434bc5c85ce744470ae472e52c3", "parents": [ "8174f1503f4bf7e9a14b3fbbfdb30c6be6e29f77" ], "author": { "name": "Matt Helsley", "email": "matthltc@us.ibm.com", "time": "Sat Oct 18 20:27:21 2008 -0700" }, "committer": { "name": "Linus Torvalds", "email": "torvalds@linux-foundation.org", "time": "Mon Oct 20 08:52:34 2008 -0700" }, "message": "container freezer: implement freezer cgroup subsystem\n\nThis patch implements a new freezer subsystem in the control groups\nframework. It provides a way to stop and resume execution of all tasks in\na cgroup by writing in the cgroup filesystem.\n\nThe freezer subsystem in the container filesystem defines a file named\nfreezer.state. Writing \"FROZEN\" to the state file will freeze all tasks\nin the cgroup. Subsequently writing \"RUNNING\" will unfreeze the tasks in\nthe cgroup. Reading will return the current state.\n\n* Examples of usage :\n\n # mkdir /containers/freezer\n # mount -t cgroup -ofreezer freezer /containers\n # mkdir /containers/0\n # echo $some_pid \u003e /containers/0/tasks\n\nto get status of the freezer subsystem :\n\n # cat /containers/0/freezer.state\n RUNNING\n\nto freeze all tasks in the container :\n\n # echo FROZEN \u003e /containers/0/freezer.state\n # cat /containers/0/freezer.state\n FREEZING\n # cat /containers/0/freezer.state\n FROZEN\n\nto unfreeze all tasks in the container :\n\n # echo RUNNING \u003e /containers/0/freezer.state\n # cat /containers/0/freezer.state\n RUNNING\n\nThis is the basic mechanism which should do the right thing for user space\ntask in a simple scenario.\n\nIt\u0027s important to note that freezing can be incomplete. In that case we\nreturn EBUSY. This means that some tasks in the cgroup are busy doing\nsomething that prevents us from completely freezing the cgroup at this\ntime. After EBUSY, the cgroup will remain partially frozen -- reflected\nby freezer.state reporting \"FREEZING\" when read. The state will remain\n\"FREEZING\" until one of these things happens:\n\n\t1) Userspace cancels the freezing operation by writing \"RUNNING\" to\n\t\tthe freezer.state file\n\t2) Userspace retries the freezing operation by writing \"FROZEN\" to\n\t\tthe freezer.state file (writing \"FREEZING\" is not legal\n\t\tand returns EIO)\n\t3) The tasks that blocked the cgroup from entering the \"FROZEN\"\n\t\tstate disappear from the cgroup\u0027s set of tasks.\n\n[akpm@linux-foundation.org: coding-style fixes]\n[akpm@linux-foundation.org: export thaw_process]\nSigned-off-by: Cedric Le Goater \u003cclg@fr.ibm.com\u003e\nSigned-off-by: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nAcked-by: Serge E. Hallyn \u003cserue@us.ibm.com\u003e\nTested-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" } ] }