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Message-ID: <4A0CAC78.7060107@redhat.com>
Date: Thu, 14 May 2009 19:42:48 -0400
From: Rik van Riel <riel@...hat.com>
To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Christoph Lameter <cl@...ux-foundation.org>,
Wu Fengguang <fengguang.wu@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"hannes@...xchg.org" <hannes@...xchg.org>,
"peterz@...radead.org" <peterz@...radead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"tytso@....edu" <tytso@....edu>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"elladan@...imo.com" <elladan@...imo.com>,
"npiggin@...e.de" <npiggin@...e.de>,
"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH -mm] vmscan: protect a fraction of file backed mapped
pages from reclaim
KOSAKI Motohiro wrote:
>>>> The percentage of file backed pages protected is set via
>>>> /proc/sys/vm/file_mapped_ratio. This defaults to 20%.
>>> Why do you think typical mapped ratio is less than 20% on desktop machine?
>> Observation of the typical mapped size of Firefox under KDE.
>
> My point is, desktop people have very various mapped ratio.
> Do you oppose this?
I suspect that the mapped ratio could be much higher
on my system. I have only 2GB of RAM dedicated to my
dom0 (which is also my desktop) and the amount of page
cache often goes down to about 150MB.
At the moment nr_mapped is 26400 and the amount of
memory taken up by buffer and page cache together is
a little over 300MB. That's close to 50%.
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