From: Andrew Morton <akpm@linux-foundation.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>,
Manfred Spraul <manfred@colorfullife.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: repeatable slab corruption with LTP msgctl08
Date: Thu, 12 Jun 2008 02:08:46 -0700 [thread overview]
Message-ID: <20080612020846.c77761cd.akpm@linux-foundation.org> (raw)
In-Reply-To: <87mylrnj84.fsf@basil.nowhere.org>
On Thu, 12 Jun 2008 10:35:55 +0200 Andi Kleen <andi@firstfloor.org> wrote:
> Andrew Morton <akpm@linux-foundation.org> writes:
> >
> > Doing the same thing on 2.6.26-rc5-mm3, msgctl08 also runs to
> > completion, in 20.9 seconds. So
> >
> > - it got slower
>
> That is because it scales itself to the number of available msg queues.
> So with Nadia's patch there are more and it runs slower.
>
> In fact it seems to start one process per message queue, so perhaps it's
> just running out of processes or something. Ok it should not segfault.
>
> BTW a great way to debug slab corruptions with LTP faster is to run with
> a slab thrasher stress module like http://firstfloor.org/~andi/crasher-26.diff
>
Something like that might be needed. I ran it again and it took 49
minutes to crash.
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next prev parent reply other threads:[~2008-06-12 9:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-12 5:13 Andrew Morton
2008-06-12 6:34 ` Andrew Morton
2008-06-12 8:02 ` Andrew Morton
2008-06-12 8:15 ` Andrew Morton
2008-06-12 8:16 ` Andrew Morton
2008-06-12 8:35 ` Andi Kleen
2008-06-12 9:08 ` Andrew Morton [this message]
2008-06-12 10:24 ` Andrew Morton
2008-06-12 10:41 ` Andi Kleen
2008-06-12 10:35 ` Pekka J Enberg
2008-06-12 17:13 ` Christoph Lameter
2008-06-12 18:33 ` Manfred Spraul
2008-06-12 18:41 ` Andrew Morton
2008-06-12 19:09 ` Manfred Spraul
2008-06-12 19:20 ` Andrew Morton
2008-06-12 19:27 ` Pekka Enberg
2008-06-13 7:03 ` Nadia Derbey
2008-06-13 8:33 ` Nadia Derbey
2008-06-13 8:42 ` Andrew Morton
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