On Fri, 28 Jan 2011 12:26:08 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote: > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > > 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 <kamezawa.hiroyu@xxxxxxxxxxxxxx> Acked-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx> Thanks, Daisuke Nishimura. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx 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@xxxxxxxxx";> email@xxxxxxxxx </a>