From: Ed Tomlinson <tomlins@cam.org>
To: Rik Van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Song Jiang <sjiang@lanl.gov>
Subject: Re: [PATCH] 0/2 swap token tuning
Date: Mon, 27 Jun 2005 19:46:32 -0400 [thread overview]
Message-ID: <200506271946.33083.tomlins@cam.org> (raw)
In-Reply-To: <Pine.LNX.4.61.0506261827500.18834@chimarrao.boston.redhat.com>
On Sunday 26 June 2005 18:34, Rik Van Riel wrote:
> A while ago the swap token (aka token based thrashing control)
> mechanism was introduced into Linux. This code improves performance
> under heavy VM loads, but can reduce performance under very light
> VM loads.
>
> The cause turns out to be me overlooking something in the original
> token based thrashing control paper: the swap token is only supposed
> to be enforced while the task holding the swap token is paging data
> in, not while the task is running (and referencing its working set).
>
> The temporary solution in Linux was to disable the swap token code
> and have users turn it on again via /proc. The following patch
> instead approximates the "only enforce the swap token if the task
> holding it is swapping something in" idea. This should make sure
> the swap token is effectively disabled when the VM load is low.
>
> I have not benchmarked these patches yet; instead, I'm posting
> them before the weekend is over, hoping to catch a bit of test
> time from others while my own tests are being run ;)
Rik,
What are the suggested values to put into /proc/sys/vm/swap_token_timeout ?
The docs are not at all clear about this (proc/filesystems.txt).
TIA,
Ed Tomlinson
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next prev parent reply other threads:[~2005-06-27 23:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-26 22:34 Rik Van Riel
2005-06-26 22:34 ` [PATCH] 1/2 " Rik Van Riel
2005-06-26 22:35 ` [PATCH] 2/2 " Rik Van Riel
2005-06-27 13:04 ` Martin Schlemmer
2005-06-27 13:08 ` Rik Van Riel
2005-06-27 13:47 ` Martin Schlemmer
2005-06-27 23:46 ` Ed Tomlinson [this message]
2005-06-27 23:59 ` [PATCH] 0/2 " Rik Van Riel
2005-06-28 0:04 ` Rik Van Riel
2005-06-28 0:06 ` Rik Van Riel
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