linux-kernel - Re: [patch 10/11] mm: memcg: only check swap cache pages for repeated charging

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Date:	Mon, 09 Jul 2012 12:26:46 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 10/11] mm: memcg: only check swap cache pages for repeated
 charging

(2012/07/05 9:45), Johannes Weiner wrote:
> Only anon and shmem pages in the swap cache are attempted to be
> charged multiple times, from every swap pte fault or from
> shmem_unuse().  No other pages require checking PageCgroupUsed().
> 
> Charging pages in the swap cache is also serialized by the page lock,
> and since both the try_charge and commit_charge are called under the
> same page lock section, the PageCgroupUsed() check might as well
> happen before the counter charging, let alone reclaim.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

You're right. This is SwapCache handling is done by commit d13d144309d...
I should notice this....

Thank you very much !

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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