diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-01-07 18:08:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-08 08:31:06 -0800 |
| commit | a636b327f731143ccc544b966cfd8de6cb6d72c6 (patch) | |
| tree | e53b03b64e8ebca20649c2d877bc4c3ef54ec34c /mm/oom_kill.c | |
| parent | 2e4d40915fb85207fe48cfc31201824ec6d7426e (diff) | |
| download | linux-a636b327f731143ccc544b966cfd8de6cb6d72c6.tar.bz2 | |
memcg: avoid unnecessary system-wide-oom-killer
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>
Diffstat (limited to 'mm/oom_kill.c')
| -rw-r--r-- | mm/oom_kill.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 6b9e758c98a5..fd150e3a2567 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -560,6 +560,13 @@ void pagefault_out_of_memory(void) /* Got some memory back in the last second. */ return; + /* + * If this is from memcg, oom-killer is already invoked. + * and not worth to go system-wide-oom. + */ + if (mem_cgroup_oom_called(current)) + goto rest_and_return; + if (sysctl_panic_on_oom) panic("out of memory from page fault. panic_on_oom is selected.\n"); @@ -571,6 +578,7 @@ void pagefault_out_of_memory(void) * Give "p" a good chance of killing itself before we * retry to allocate memory. */ +rest_and_return: if (!test_thread_flag(TIF_MEMDIE)) schedule_timeout_uninterruptible(1); } |