)]}'
{
  "log": [
    {
      "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": "b00f4dc5ff022cb9cbaffd376d9454d7fa1e496f",
      "tree": "40f1b232e2f1e8ac365317a14fdcbcb331722b46",
      "parents": [
        "1eac8111e0763853266a171ce11214da3a347a0a",
        "b9e26dfdad5a4f9cbdaacafac6998614cc9c41bc"
      ],
      "author": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed Dec 21 21:59:45 2011 +0100"
      },
      "committer": {
        "name": "Rafael J. Wysocki",
        "email": "rjw@sisk.pl",
        "time": "Wed Dec 21 21:59:45 2011 +0100"
      },
      "message": "Merge branch \u0027master\u0027 into pm-sleep\n\n* master: (848 commits)\n  SELinux: Fix RCU deref check warning in sel_netport_insert()\n  binary_sysctl(): fix memory leak\n  mm/vmalloc.c: remove static declaration of va from __get_vm_area_node\n  ipmi_watchdog: restore settings when BMC reset\n  oom: fix integer overflow of points in oom_badness\n  memcg: keep root group unchanged if creation fails\n  nilfs2: potential integer overflow in nilfs_ioctl_clean_segments()\n  nilfs2: unbreak compat ioctl\n  cpusets: stall when updating mems_allowed for mempolicy or disjoint nodemask\n  evm: prevent racing during tfm allocation\n  evm: key must be set once during initialization\n  mmc: vub300: fix type of firmware_rom_wait_states module parameter\n  Revert \"mmc: enable runtime PM by default\"\n  mmc: sdhci: remove \"state\" argument from sdhci_suspend_host\n  x86, dumpstack: Fix code bytes breakage due to missing KERN_CONT\n  IB/qib: Correct sense on freectxts increment and decrement\n  RDMA/cma: Verify private data length\n  cgroups: fix a css_set not found bug in cgroup_attach_proc\n  oprofile: Fix uninitialized memory access when writing to writing to oprofilefs\n  Revert \"xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel\"\n  ...\n\nConflicts:\n\tkernel/cgroup_freezer.c\n"
    },
    {
      "commit": "bb9d97b6dffa10cec5e1ce9adbce60f3c2b5eabc",
      "tree": "fb8351518fcfb91927e9e138f48284c44553f011",
      "parents": [
        "2f7ee5691eecb67c8108b92001a85563ea336ac5"
      ],
      "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: don\u0027t use subsys-\u003ecan_attach_task() or -\u003eattach_task()\n\nNow that subsys-\u003ecan_attach() and attach() take @tset instead of\n@task, they can handle per-task operations.  Convert\n-\u003ecan_attach_task() and -\u003eattach_task() users to use -\u003ecan_attach()\nand attach() instead.  Most converions are straight-forward.\nNoteworthy changes are,\n\n* In cgroup_freezer, remove unnecessary NULL assignments to unused\n  methods.  It\u0027s useless and very prone to get out of sync, which\n  already happened.\n\n* In cpuset, PF_THREAD_BOUND test is checked for each task.  This\n  doesn\u0027t make any practical difference but is conceptually cleaner.\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: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Paul Menage \u003cpaul@paulmenage.org\u003e\nCc: Balbir Singh \u003cbsingharora@gmail.com\u003e\nCc: Daisuke Nishimura \u003cnishimura@mxp.nes.nec.co.jp\u003e\nCc: James Morris \u003cjmorris@namei.org\u003e\nCc: Ingo Molnar \u003cmingo@elte.hu\u003e\nCc: Peter Zijlstra \u003cpeterz@infradead.org\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": "884a45d964dd395eda945842afff5e16bcaedf56",
      "tree": "47a28f7231d65cff01f797ad1ad74e4a82a86839",
      "parents": [
        "860ca0e6f72d21ded33ce14be9a53eb103f88441"
      ],
      "author": {
        "name": "Michal Hocko",
        "email": "mhocko@suse.cz",
        "time": "Tue Nov 22 07:44:47 2011 -0800"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Thu Nov 24 11:58:22 2011 -0800"
      },
      "message": "cgroup_freezer: fix freezing groups with stopped tasks\n\n2d3cbf8b (cgroup_freezer: update_freezer_state() does incorrect state\ntransitions) removed is_task_frozen_enough and replaced it with a simple\nfrozen call. This, however, breaks freezing for a group with stopped tasks\nbecause those cannot be frozen and so the group remains in CGROUP_FREEZING\nstate (update_if_frozen doesn\u0027t count stopped tasks) and never reaches\nCGROUP_FROZEN.\n\nLet\u0027s add is_task_frozen_enough back and use it at the original locations\n(update_if_frozen and try_to_freeze_cgroup). Semantically we consider\nstopped tasks as frozen enough so we should consider both cases when\ntesting frozen tasks.\n\nTestcase:\nmkdir /dev/freezer\nmount -t cgroup -o freezer none /dev/freezer\nmkdir /dev/freezer/foo\nsleep 1h \u0026\npid\u003d$!\nkill -STOP $pid\necho $pid \u003e /dev/freezer/foo/tasks\necho FROZEN \u003e /dev/freezer/foo/freezer.state\nwhile true\ndo\n\tcat /dev/freezer/foo/freezer.state\n\t[ \"`cat /dev/freezer/foo/freezer.state`\" \u003d \"FROZEN\" ] \u0026\u0026 break\n\tsleep 1\ndone\necho OK\n\nSigned-off-by: Michal Hocko \u003cmhocko@suse.cz\u003e\nAcked-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Tomasz Buchert \u003ctomasz.buchert@inria.fr\u003e\nCc: Paul Menage \u003cpaul@paulmenage.org\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: stable@kernel.org\nSigned-off-by: Tejun Heo \u003chtejun@gmail.com\u003e\n"
    },
    {
      "commit": "839e3407d90a810318d17c17ceb3d5928a910704",
      "tree": "9b75e8f69cadba5d33537698931cf637a22d423b",
      "parents": [
        "37ad8aca94a1da2112a7c56151390914e80d1113"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:26 2011 -0800"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:26 2011 -0800"
      },
      "message": "freezer: remove unused @sig_only from freeze_task()\n\nAfter \"freezer: make freezing() test freeze conditions in effect\ninstead of TIF_FREEZE\", freezing() returns authoritative answer on\nwhether the current task should freeze or not and freeze_task()\ndoesn\u0027t need or use @sig_only.  Remove it.\n\nWhile at it, rewrite function comment for freeze_task() and rename\n@sig_only to @user_only in try_to_freeze_tasks().\n\nThis patch doesn\u0027t cause any functional change.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Oleg Nesterov \u003coleg@redhat.com\u003e\n"
    },
    {
      "commit": "a3201227f803ad7fd43180c5195dbe5a2bf998aa",
      "tree": "1845ba06346f8a8772fe1c90f8960bd1a430d05c",
      "parents": [
        "22b4e111fa01a1147aa562ceaf18a752a928ef4e"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:25 2011 -0800"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:25 2011 -0800"
      },
      "message": "freezer: make freezing() test freeze conditions in effect instead of TIF_FREEZE\n\nUsing TIF_FREEZE for freezing worked when there was only single\nfreezing condition (the PM one); however, now there is also the\ncgroup_freezer and single bit flag is getting clumsy.\nthaw_processes() is already testing whether cgroup freezing in in\neffect to avoid thawing tasks which were frozen by both PM and cgroup\nfreezers.\n\nThis is racy (nothing prevents race against cgroup freezing) and\nfragile.  A much simpler way is to test actual freeze conditions from\nfreezing() - ie. directly test whether PM or cgroup freezing is in\neffect.\n\nThis patch adds variables to indicate whether and what type of\nfreezing conditions are in effect and reimplements freezing() such\nthat it directly tests whether any of the two freezing conditions is\nactive and the task should freeze.  On fast path, freezing() is still\nvery cheap - it only tests system_freezing_cnt.\n\nThis makes the clumsy dancing aroung TIF_FREEZE unnecessary and\nfreeze/thaw operations more usual - updating state variables for the\nnew state and nudging target tasks so that they notice the new state\nand comply.  As long as the nudging happens after state update, it\u0027s\nrace-free.\n\n* This allows use of freezing() in freeze_task().  Replace the open\n  coded tests with freezing().\n\n* p !\u003d current test is added to warning printing conditions in\n  try_to_freeze_tasks() failure path.  This is necessary as freezing()\n  is now true for the task which initiated freezing too.\n\n-v2: Oleg pointed out that re-freezing FROZEN cgroup could increment\n     system_freezing_cnt.  Fixed.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Paul Menage \u003cpaul@paulmenage.org\u003e  (for the cgroup portions)\n"
    },
    {
      "commit": "22b4e111fa01a1147aa562ceaf18a752a928ef4e",
      "tree": "f4b29f532678c72edf99bb8df3ba64d526bc8a3c",
      "parents": [
        "03afed8bc296fa70186ba832c1126228bb992465"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:25 2011 -0800"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:25 2011 -0800"
      },
      "message": "cgroup_freezer: prepare for removal of TIF_FREEZE\n\nTIF_FREEZE will be removed soon and freezing() will directly test\nwhether any freezing condition is in effect.  Make the following\nchanges in preparation.\n\n* Rename cgroup_freezing_or_frozen() to cgroup_freezing() and make it\n  return bool.\n\n* Make cgroup_freezing() access task_freezer() under rcu read lock\n  instead of task_lock().  This makes the state dereferencing racy\n  against task moving to another cgroup; however, it was already racy\n  without this change as -\u003estate dereference wasn\u0027t synchronized.\n  This will be later dealt with using attach hooks.\n\n* freezer-\u003estate is now set before trying to push tasks into the\n  target state.\n\n-v2: Oleg pointed out that freeze_change_state() was setting\n     freeze-\u003estate incorrectly to CGROUP_FROZEN instead of\n     CGROUP_FREEZING.  Fixed.\n\n-v3: Matt pointed out that setting CGROUP_FROZEN used to always invoke\n     try_to_freeze_cgroup() regardless of the current state.  Patch\n     updated such that the actual freeze/thaw operations are always\n     performed on invocation.  This shouldn\u0027t make any difference\n     unless something is broken.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nAcked-by: Paul Menage \u003cpaul@paulmenage.org\u003e\nCc: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\n"
    },
    {
      "commit": "6907483b4e803a20f0b48cc9afa3817420ce61c5",
      "tree": "9f4b7cbe59eae0c6f59d704e4f465d537c172479",
      "parents": [
        "0c9af09262864a2744091ee94c98c4a8fd60c98b"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:24 2011 -0800"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:24 2011 -0800"
      },
      "message": "freezer: make freezing indicate freeze condition in effect\n\nCurrently freezing (TIF_FREEZE) and frozen (PF_FROZEN) states are\ninterlocked - freezing is set to request freeze and when the task\nactually freezes, it clears freezing and sets frozen.\n\nThis interlocking makes things more complex than necessary - freezing\ndoesn\u0027t mean there\u0027s freezing condition in effect and frozen doesn\u0027t\nmatch the task actually entering and leaving frozen state (it\u0027s\ncleared by the thawing task).\n\nThis patch makes freezing indicate that freeze condition is in effect.\nA task enters and stays frozen if freezing.  This makes PF_FROZEN\nmanipulation done only by the task itself and prevents wakeup from\n__thaw_task() leaking outside of refrigerator.\n\nThe only place which needs to tell freezing \u0026\u0026 !frozen is\ntry_to_freeze_task() to whine about tasks which don\u0027t enter frozen.\nIt\u0027s updated to test the condition explicitly.\n\nWith the change, frozen() state my linger after __thaw_task() until\nthe task wakes up and exits fridge.  This can trigger BUG_ON() in\nupdate_if_frozen().  Work it around by testing freezing() \u0026\u0026 frozen()\ninstead of frozen().\n\n-v2: Oleg pointed out missing re-check of freezing() when trying to\n     clear FROZEN and possible spurious BUG_ON() trigger in\n     update_if_frozen().  Both fixed.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Oleg Nesterov \u003coleg@redhat.com\u003e\nCc: Paul Menage \u003cpaul@paulmenage.org\u003e\n"
    },
    {
      "commit": "a5be2d0d1a8746e7be5210e3d6b904455000443c",
      "tree": "1dcfa2725057a73059a3f768f5f5f7825b5d56ef",
      "parents": [
        "8a32c441c1609f80e55df75422324a1151208f40"
      ],
      "author": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:23 2011 -0800"
      },
      "committer": {
        "name": "Tejun Heo",
        "email": "tj@kernel.org",
        "time": "Mon Nov 21 12:32:23 2011 -0800"
      },
      "message": "freezer: rename thaw_process() to __thaw_task() and simplify the implementation\n\nthaw_process() now has only internal users - system and cgroup\nfreezers.  Remove the unnecessary return value, rename, unexport and\ncollapse __thaw_process() into it.  This will help further updates to\nthe freezer code.\n\n-v3: oom_kill grew a use of thaw_process() while this patch was\n     pending.  Convert it to use __thaw_task() for now.  In the longer\n     term, this should be handled by allowing tasks to die if killed\n     even if it\u0027s frozen.\n\n-v2: minor style update as suggested by Matt.\n\nSigned-off-by: Tejun Heo \u003ctj@kernel.org\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\n"
    },
    {
      "commit": "9984de1a5a8a96275fcab818f7419af5a3c86e71",
      "tree": "1935d411752707a1621c5caf64f75dfe105beb3a",
      "parents": [
        "7c77509c542927ee2a3c8812fad84957e51bf67d"
      ],
      "author": {
        "name": "Paul Gortmaker",
        "email": "paul.gortmaker@windriver.com",
        "time": "Mon May 23 14:51:41 2011 -0400"
      },
      "committer": {
        "name": "Paul Gortmaker",
        "email": "paul.gortmaker@windriver.com",
        "time": "Mon Oct 31 09:20:12 2011 -0400"
      },
      "message": "kernel: Map most files to use export.h instead of module.h\n\nThe changed files were only including linux/module.h for the\nEXPORT_SYMBOL infrastructure, and nothing else.  Revector them\nonto the isolated export header for faster compile times.\n\nNothing to see here but a whole lot of instances of:\n\n  -#include \u003clinux/module.h\u003e\n  +#include \u003clinux/export.h\u003e\n\nThis commit is only changing the kernel dir; next targets\nwill probably be mm, fs, the arch dirs, etc.\n\nSigned-off-by: Paul Gortmaker \u003cpaul.gortmaker@windriver.com\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": "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"
    }
  ]
}