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git.kernel.org/linux-stable/linux-3.2.y
linux-imx/Documentation/cgroups
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Zefan Li eb33a02fdd cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 
commit 2ad654bc5e upstream.

When we change cpuset.memory_spread_{page,slab}, cpuset will flip
PF_SPREAD_{PAGE,SLAB} bit of tsk->flags for each task in that cpuset.
This should be done using atomic bitops, but currently we don't,
which is broken.

Tetsuo reported a hard-to-reproduce kernel crash on RHEL6, which happened
when one thread tried to clear PF_USED_MATH while at the same time another
thread tried to flip PF_SPREAD_PAGE/PF_SPREAD_SLAB. They both operate on
the same task.

Here's the full report:
https://lkml.org/lkml/2014/9/19/230

To fix this, we make PF_SPREAD_PAGE and PF_SPREAD_SLAB atomic flags.

v4:
- updated mm/slab.c. (Fengguang Wu)
- updated Documentation.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miao Xie <miaox@cn.fujitsu.com>
Cc: Kees Cook <keescook@chromium.org>
Fixes: 950592f7b9 ("cpusets: update tasks' page/slab spread flags in time")
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
[lizf: Backported to 3.4:
 - adjust context
 - check current->flags & PF_MEMPOLICY rather than current->mempolicy]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
2017-10-12 15:27:22 +01:00
..
00-INDEX trivial: fix where cgroup documentation is not correctly referred to 2009-03-30 15:22:02 +02:00
blkio-controller.txt Documentation: fix cgroup blkio throttle filenames 2011-07-06 13:17:51 -07:00
cgroup_event_listener.c tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
cgroups.txt Documentation: update cgroups notes 2011-11-04 12:01:46 -07:00
cpuacct.txt Documentation: fix echo command in cgroups/cpuacct.txt 2011-07-23 10:58:08 -07:00
cpusets.txt cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2017-10-12 15:27:22 +01:00
devices.txt Documentation: update cgroupfs mount point 2011-06-15 21:52:50 -07:00
freezer-subsystem.txt Documentation: Fix typo in freezer-subsystem.txt 2011-11-07 23:02:25 +01:00
memcg_test.txt tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
memory.txt memcg: oom: fix totalpages calculation for memory.swappiness==0 2012-12-06 11:20:08 +00:00
resource_counter.txt res_counter: update documentation 2009-04-13 15:04:30 -07:00