linux-kernel - Re: [PATCH 3/4] mm: Activate !PageLRU pages on mark_page

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Date:	Wed, 15 May 2013 13:40:58 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Alexey Lyahkov <alexey.lyashkov@...il.com>,
	Andrew Perepechko <anserper@...ru>,
	Robin Dong <sanbai@...bao.com>, Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Bernd Schubert <bernd.schubert@...tmail.fm>,
	David Howells <dhowells@...hat.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux-ext4 <linux-ext4@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 3/4] mm: Activate !PageLRU pages on mark_page_accessed
 if page is on local pagevec

On 05/13/2013 06:21 AM, Mel Gorman wrote:

> In this case a PageActive page is added to the inactivate list and later the
> inactive/active stats will get skewed. While the PageActive checks in vmscan
> could be removed and potentially dealt with, a skew in the statistics would
> be very difficult to detect. Hence this patch deals just with the common case
> where a page being marked accessed has just been added to the local pagevec.
>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

After thinking about it some more, I suspect the possible issue
I outlined before should not be an issue in practice.

Acked-by: Rik van Riel <riel@...hat.com>


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