linux-kernel - Re: [PATCH] mm: page_alloc: Avoid marking zones full prematurely after zone

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Message-ID: <5163EB59.3010204@gmail.com>
Date:	Tue, 09 Apr 2013 18:20:09 +0800
From:	Simon Jeons <simon.jeons@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hedi Berriche <hedi@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: page_alloc: Avoid marking zones full prematurely
 after zone_reclaim()

Hi Michal,
On 04/09/2013 06:14 PM, Michal Hocko wrote:
> On Tue 09-04-13 18:05:30, Simon Jeons wrote:
> [...]
>>> I try this in v3.9-rc5:
>>> dd if=/dev/sda of=/dev/null bs=1MB
>>> 14813+0 records in
>>> 14812+0 records out
>>> 14812000000 bytes (15 GB) copied, 105.988 s, 140 MB/s
>>>
>>> free -m -s 1
>>>
>>>                    total       used       free     shared buffers
>>> cached
>>> Mem:          7912       1181       6731          0 663        239
>>> -/+ buffers/cache:        277       7634
>>> Swap:         8011          0       8011
>>>
>>> It seems that almost 15GB copied before I stop dd, but the used
>>> pages which I monitor during dd always around 1200MB. Weird, why?
>>>
>> Sorry for waste your time, but the test result is weird, is it?
> I am not sure which values you have been watching but you have to
> realize that you are reading a _partition_ not a file and those pages
> go into buffers rather than the page chache.

buffer cache are contained in page cache, is it? Which value I should watch?


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