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From: Al Boldi <a1426z@gawab.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [RFC] Limit the size of the pagecache
Date: Thu, 25 Jan 2007 09:42:47 +0300	[thread overview]
Message-ID: <200701250942.47321.a1426z@gawab.com> (raw)

Rik van Riel wrote:
> Christoph Lameter wrote:
> > This is a patch using some of Aubrey's work plugging it in what is IMHO
> > the right way. Feel free to improve on it. I have gotten repeatedly
> > requests to be able to limit the pagecache.
>
> IMHO it's a bad hack.
>
> It would be better to identify the problem this "feature" is
> trying to fix, and then fix the root cause.

Ok, here is the problem:  kswapd.

Limiting the page-cache memory inhibits invoking kswapd needlessly, aiding 
performance and easing OOM pressures.

I tried the patch; it works.

But it needs a bit of debugging.  Setting pagecache_ratio = 1 either 
deadlocks or reduces thru-put to < 1mb/s.


Thanks!

--
Al


             reply	other threads:[~2007-01-25  6:40 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-25  6:42 Al Boldi [this message]
2007-01-25  8:24 ` Vaidyanathan Srinivasan
2007-01-25 10:29   ` Peter Zijlstra
2007-01-25 11:23     ` Vaidyanathan Srinivasan
2007-01-25 11:57     ` Al Boldi
2007-01-25 11:57   ` Al Boldi
2007-01-25 18:37     ` Vaidyanathan Srinivasan
     [not found] <7GEEK-4lH-39@gated-at.bofh.it>
     [not found] ` <7GLdb-5Uz-13@gated-at.bofh.it>
     [not found]   ` <7GRix-7fU-1@gated-at.bofh.it>
     [not found]     ` <7GRLZ-7Uy-29@gated-at.bofh.it>
2007-01-25 14:51       ` Bodo Eggert
  -- strict thread matches above, loose matches on Subject: below --
2007-01-24  0:49 Christoph Lameter
2007-01-24  2:53 ` KAMEZAWA Hiroyuki
2007-01-24  3:01   ` Christoph Lameter
2007-01-24  5:47   ` Aubrey Li
2007-01-24  3:00 ` Nick Piggin
2007-01-24  3:14   ` Christoph Lameter
2007-01-24  3:51     ` Aubrey Li
2007-01-24  4:03       ` Nick Piggin
2007-01-26 10:27         ` Andrew Morton
2007-01-24  3:13 ` KAMEZAWA Hiroyuki
2007-01-24  4:30   ` Christoph Lameter
2007-01-24  5:15     ` KAMEZAWA Hiroyuki
2007-01-25  0:32       ` KAMEZAWA Hiroyuki
2007-01-25  2:41         ` Christoph Lameter
2007-01-25  3:12           ` KAMEZAWA Hiroyuki
2007-01-25  4:28             ` Rik van Riel
2007-01-25  5:19               ` KAMEZAWA Hiroyuki
2007-01-25  5:40                 ` Rik van Riel
2007-01-25  6:00                   ` KAMEZAWA Hiroyuki
2007-01-26 10:29       ` Andrew Morton
2007-01-26 18:01         ` KAMEZAWA Hiroyuki
2007-01-24  7:04 ` Vaidyanathan Srinivasan
2007-01-24  7:55 ` Peter Zijlstra
2007-01-24 12:50   ` Nick Piggin
2007-01-24 12:58     ` Peter Zijlstra
2007-01-24 14:58     ` Christoph Lameter
2007-01-24 20:06       ` Erik Andersen
2007-01-25  2:40         ` Christoph Lameter
2007-01-25  8:07           ` Vaidyanathan Srinivasan
2007-01-24 14:22   ` Aubrey Li
2007-01-24 14:56     ` Peter Zijlstra
2007-01-25  2:27       ` Aubrey Li
2007-01-24 12:33 ` Vaidyanathan Srinivasan
2007-01-24 14:56   ` Christoph Lameter
2007-01-25  4:17     ` Vaidyanathan Srinivasan
2007-01-25  4:45       ` Rik van Riel
2007-01-25  5:49         ` Vaidyanathan Srinivasan
2007-01-25 16:07           ` Rik van Riel
2007-01-25 17:57             ` Balbir Singh
2007-01-25  6:35       ` Aubrey Li
2007-01-25  6:47         ` Christoph Lameter
2007-01-25  7:49         ` Vaidyanathan Srinivasan
2007-01-25  4:18 ` Rik van Riel

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