Re: [PATCH 4/7] memcg : fix charge function of THP allocation.

From: Johannes Weiner
Date: Thu Jan 27 2011 - 05:34:50 EST

On Fri, Jan 21, 2011 at 03:44:30PM +0900, KAMEZAWA Hiroyuki 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.
> - distinguish THP allocaton from Bached allocation.

This does too many things at once. Can you split this into more
patches where each one has a single objective? Thanks.

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