linux-ext4 - Re: [RFC PATCH 0/3] Obey mark_page_accessed hint given by filesystems

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Message-ID: <20130501080819.GF11497@suse.de>
Date:	Wed, 1 May 2013 09:08:19 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Will Huck <will.huckk@...il.com>
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>,
	Rik van Riel <riel@...hat.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: [RFC PATCH 0/3] Obey mark_page_accessed hint given by filesystems

On Wed, May 01, 2013 at 02:28:17PM +0800, Will Huck wrote:
> Hi Mel,
> On 04/30/2013 12:31 AM, Mel Gorman wrote:
> >Andrew Perepechko reported a problem whereby pages are being prematurely
> >evicted as the mark_page_accessed() hint is ignored for pages that are
> >currently on a pagevec -- http://www.spinics.net/lists/linux-ext4/msg37340.html .
> >Alexey Lyahkov and Robin Dong have also reported problems recently that
> >could be due to hot pages reaching the end of the inactive list too quickly
> >and be reclaimed.
> 
> Both shrink_active_list and shrink_inactive_list can call
> lru_add_drain(), why the hot pages can't be mark Actived during this
> time?
> 

Because by then it's not known that the filesystem had called
mark_page_accessed() to indicate the page should be activated.

-- 
Mel Gorman
SUSE Labs
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