linux-kernel - Re: [PATCH 2/3] mm: Ensure that mark_page_accessed moves pages to the active list

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Message-ID: <5180CED8.9040505@gmail.com>
Date:	Wed, 01 May 2013 16:14:16 +0800
From:	Ric Mason <ric.masonn@...il.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Sam Ben <sam.bennn@...il.com>,
	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: [PATCH 2/3] mm: Ensure that mark_page_accessed moves pages to
 the active list

On 05/01/2013 04:06 PM, Mel Gorman wrote:
> On Wed, May 01, 2013 at 01:41:34PM +0800, Sam Ben wrote:
>> Hi Mel,
>> On 04/30/2013 12:31 AM, Mel Gorman wrote:
>>> If a page is on a pagevec then it is !PageLRU and mark_page_accessed()
>>> may fail to move a page to the active list as expected. Now that the
>>> LRU is selected at LRU drain time, mark pages PageActive if they are
>>> on a pagevec so it gets moved to the correct list at LRU drain time.
>>> Using a debugging patch it was found that for a simple git checkout
>>> based workload that pages were never added to the active file list in
>> Could you show us the details of your workload?
>>
> The workload is git checkouts of a fixed number of commits for the

Is there script which you used?

> kernel git tree. It starts with a warm-up run that is not timed and then
> records the time for a number of iterations.

How to record the time for a number of iterations? Is the iteration here 
means lru scan?

>

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