Re: Linux machines dieing in swap storms
- From: Bodo Eggert <7eggert@xxxxxx>
- Date: Fri, 26 Oct 2007 05:56:49 +0200
Rik van Riel <riel@xxxxxxxxxx> wrote:
On Thu, 25 Oct 2007 16:20:41 +0100
Richard Purdie <rpurdie@xxxxxxxxx> wrote:
Advice on solving this welcome preferably in mainline but I'll happily
hack my kernels with a workaround if need be.
I can't see any easy hacks or workarounds to fix the issue in the
current MM, except maybe activate the OOM killer if the amount of
page cache and buffer cache is really low and swap is full...
In the longer run, I'm working on:
http://linux-mm.org/PageReplacementDesign
What about only reclaimimn cache if the cache has grown beyond a watermark
and only reclaimimn non-cache if it's below another watermark? I can imagine
it will solve my diskcache-pushes-out-mousehandler problem, and I'm pretty
sure having very low file cache is bad for performance, too.
Another thing I can imagine is to detect thrashing conditions and to
change scheduling in order to increase the likehood of cache hits and
thereby progress: If an application just got a page, keep it running for
a while (accumulating negative credits).
--
"Of course, as admin, I can read all your email. But I am not THAT bored!"
-- unknown author in comp.unix.aix
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