From: Andi Kleen <andi@firstfloor.org>
To: Andrew Morton <akpm@linux-foundation.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 10:35:55 +0200 [thread overview]
Message-ID: <87mylrnj84.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20080612011537.6146c41d.akpm@linux-foundation.org> (Andrew Morton's message of "Thu, 12 Jun 2008 01:15:37 -0700")
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
-Andi
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next prev parent reply other threads:[~2008-06-12 8:35 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 [this message]
2008-06-12 9:08 ` Andrew Morton
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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