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memcg: avoid unnecessary system-wide-oom-killer

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Current mmtom has new oom function as pagefault_out_of_memory().  It's
added for select bad process rathar than killing current.

When memcg hit limit and calls OOM at page_fault, this handler called and
system-wide-oom handling happens.  (means kernel panics if panic_on_oom is
true....)

To avoid overkill, check memcg's recent behavior before starting
system-wide-oom.

And this patch also fixes to guarantee "don't accnout against process with
TIF_MEMDIE".  This is necessary for smooth OOM.

[akpm@linux-foundation.org: build fix]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Jan Blunck <jblunck@suse.de>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-01-07 18:08:08 -08:00 • committed by Linus Torvalds
parent 2e4d40915f
commit a636b327f7
3 changed files with 44 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
include/linux/memcontrol.h
View file

@ -102,6 +102,8 @@ static inline bool mem_cgroup_disabled(void)
return false;
}
extern bool mem_cgroup_oom_called(struct task_struct *task);
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct mem_cgroup;
@ -234,6 +236,11 @@ static inline bool mem_cgroup_disabled(void)
{
return true;
}
static inline bool mem_cgroup_oom_called(struct task_struct *task)
{
return false;
}
#endif /* CONFIG_CGROUP_MEM_CONT */
#endif /* _LINUX_MEMCONTROL_H */