From: Nick Piggin <npiggin@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-mm@kvack.org
Subject: Re: [patch 0/9] oom: various fixes and improvements for 2.6.18-rc2
Date: Fri, 28 Jul 2006 11:28:36 +0200 [thread overview]
Message-ID: <20060728092836.GB4161@wotan.suse.de> (raw)
In-Reply-To: <20060728004410.63bba676.akpm@osdl.org>
On Fri, Jul 28, 2006 at 12:44:10AM -0700, Andrew Morton wrote:
> On Fri, 28 Jul 2006 09:20:44 +0200 (CEST)
> Nick Piggin <npiggin@suse.de> wrote:
>
> > These are some various OOM killer fixes that I have accumulated. Some of
> > the more important ones are in SLES10, and were developed in response to
> > issues coming up in stress testing.
> >
> > The other small fixes haven't been widely tested, but they're issues I
> > spotted when working in this area.
> >
> > Comments?
>
> They all look good to me (although I haven't grappled with the cpuset ones
> yet).
OK.
>
> The "oom: reclaim_mapped on oom" one is kinda funny. Back in 2.5.early I
> decided that we were probably donig too much scanning before declaring oom
> so I randomly reduced it by a factor of, iirc, four. Under the assumption
> that someone would start hitting early ooms and would get in there and tune
> it for real. It took five years ;)
Well, I guess it *can* make the machine less responsive during OOM, but
I guess it is probably reasonable to trade "OOM throughput" for a system
that is more conservative about killing tasks.
The workload involved was semi-realistic I guess, involving apache/mysql
servers in a hypervisor guest. The after patch 1, it was still killing
early, and with patch 2 it seemed to be the minimum required to get it to
use up all swap first.
>
> Which of these patches have been well-tested and which are the more
> speculative ones?
1,2,3 are in SLES10, and tested/confirmed to fix things. The others I
guess are more edge cases, but I hope that together they can make things
a little more robust.
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prev parent reply other threads:[~2006-07-28 9:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-28 7:20 Nick Piggin
2006-07-28 7:20 ` [patch 1/9] oom: use unreclaimable info Nick Piggin
2006-07-28 7:21 ` [patch 2/9] oom: reclaim_mapped on oom Nick Piggin
2006-07-28 7:21 ` [patch 3/9] cpuset: oom panic fix Nick Piggin
2006-07-28 7:29 ` Nick Piggin
2006-07-28 9:06 ` Paul Jackson
2006-07-28 7:21 ` [patch 4/9] oom: cpuset hint Nick Piggin
2006-07-28 9:07 ` Paul Jackson
2006-07-28 7:21 ` [patch 5/9] oom: handle current exiting Nick Piggin
2006-07-28 7:21 ` [patch 6/9] oom: handle oom_disable exiting Nick Piggin
2006-07-28 7:21 ` [patch 7/9] oom: swapoff tasks tweak Nick Piggin
2006-07-28 7:21 ` [patch 8/9] oom: kthread infinite loop fix Nick Piggin
2006-07-28 7:22 ` [patch 9/9] oom: more printk Nick Piggin
2006-07-28 7:44 ` [patch 0/9] oom: various fixes and improvements for 2.6.18-rc2 Andrew Morton
2006-07-28 9:28 ` Nick Piggin [this message]
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