linux-kernel - Re: [patch 11/11] mm: memcg: only check anon swapin page charges for swap cache

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Message-ID: <4FFA539E.70805@jp.fujitsu.com>
Date:	Mon, 09 Jul 2012 12:44:30 +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 11/11] mm: memcg: only check anon swapin page charges
 for swap cache

(2012/07/05 9:45), Johannes Weiner wrote:
> shmem knows for sure that the page is in swap cache when attempting to
> charge a page, because the cache charge entry function has a check for
> it.  Only anon pages may be removed from swap cache already when
> trying to charge their swapin.
> 
> Adjust the comment, though: '4969c11 mm: fix swapin race condition'
> added a stable PageSwapCache check under the page lock in the
> do_swap_page() before calling the memory controller, so it's
> unuse_pte()'s pte_same() that may fail.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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


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