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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-07 18:08:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:06 -0800
commita636b327f731143ccc544b966cfd8de6cb6d72c6 (patch)
treee53b03b64e8ebca20649c2d877bc4c3ef54ec34c /include
parent2e4d40915fb85207fe48cfc31201824ec6d7426e (diff)
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 'include')
-rw-r--r--include/linux/memcontrol.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 2de6504e01f..2fdd1380bf0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -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 */