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Date: Wed, 01 May 2013 16:14:16 +0800
From: Ric Mason <ric.masonn@gmail.com>
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Subject: Re: [PATCH 2/3] mm: Ensure that mark_page_accessed moves pages to
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References: <1367253119-6461-1-git-send-email-mgorman@suse.de> <1367253119-6461-3-git-send-email-mgorman@suse.de> <5180AB0E.6030407@gmail.com> <20130501080644.GE11497@suse.de>
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To: Mel Gorman <mgorman@suse.de>
Cc: Sam Ben <sam.bennn@gmail.com>, Alexey Lyahkov <alexey.lyashkov@gmail.com>, Andrew Perepechko <anserper@ya.ru>, Robin Dong <sanbai@taobao.com>, Theodore Tso <tytso@mit.edu>, Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Bernd Schubert <bernd.schubert@fastmail.fm>, David Howells <dhowells@redhat.com>, Trond Myklebust <Trond.Myklebust@netapp.com>, Linux-fsdevel <linux-fsdevel@vger.kernel.org>, Linux-ext4 <linux-ext4@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, Linux-mm <linux-mm@kvack.org>

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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