On Fri, 28 Jan 2011 12:26:08 +0900
KAMEZAWA Hiroyuki [off-list ref] wrote:

From: KAMEZAWA Hiroyuki <redacted>

When THP is used, Hugepage size charge can happen. It's not handled
correctly in mem_cgroup_do_charge(). For example, THP can fallback
to small page allocation when HUGEPAGE allocation seems difficult
or busy, but memory cgroup doesn't understand it and continue to
try HUGEPAGE charging. And the worst thing is memory cgroup
believes 'memory reclaim succeeded' if limit - usage > PAGE_SIZE.

By this, khugepaged etc...can goes into inifinite reclaim loop
if tasks in memcg are busy.

After this patch 
 - Hugepage allocation will fail if 1st trial of page reclaim fails.

Changelog:
 - make changes small. removed renaming codes.

Signed-off-by: KAMEZAWA Hiroyuki <redacted>

Acked-by: Daisuke Nishimura <redacted>

Thanks,
Daisuke Nishimura.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>