From: Frank Mayhar <fmayhar@google.com>
To: Petr Tesarik <ptesarik@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>,
Christoph Lameter <cl@linux-foundation.org>,
Doug Chapman <doug.chapman@hp.com>,
mingo@elte.hu, roland@redhat.com, adobriyan@gmail.com,
akpm@linux-foundation.org,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: regression introduced by - timers: fix itimer/many thread hang
Date: Fri, 21 Nov 2008 11:26:03 -0800 [thread overview]
Message-ID: <1227295563.21605.13.camel@bobble.smo.corp.google.com> (raw)
In-Reply-To: <200811211942.43848.ptesarik@suse.cz>
On Fri, 2008-11-21 at 19:42 +0100, Petr Tesarik wrote:
> This is just not true. I've seen a very real example of a lockup with a very
> sane number of threads (one per CPU), but on a very large machine (1024 CPUs
> IIRC). The application set per-process CPU profiling with an interval of 1
> tick, which translates to 1024 timers firing off with each tick...
>
> Well, yes, that was broken, too, but that's the way one quite popular FORTRAN
> compiler works...
Petr, have you tried the fix in the latest kernel? Does it help? I'm
intensely curious to know how it affected your runs.
--
Frank Mayhar <fmayhar@google.com>
Google, Inc.
next prev parent reply other threads:[~2008-11-21 19:28 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1224694989.8431.23.camel@oberon>
[not found] ` <1225132746.14792.13.camel@bobble.smo.corp.google.com>
[not found] ` <1225219114.24204.37.camel@oberon>
2008-11-06 1:58 ` Frank Mayhar
2008-11-06 11:03 ` Peter Zijlstra
2008-11-06 15:03 ` Christoph Lameter
2008-11-06 15:08 ` Peter Zijlstra
2008-11-06 16:08 ` Christoph Lameter
2008-11-06 23:52 ` Frank Mayhar
2008-11-07 8:35 ` Ingo Molnar
2008-11-07 10:29 ` Peter Zijlstra
2008-11-07 18:10 ` Frank Mayhar
2008-11-07 20:26 ` Peter Zijlstra
2008-11-10 14:38 ` Christoph Lameter
2008-11-10 14:42 ` Peter Zijlstra
2008-11-10 15:41 ` Christoph Lameter
2008-11-10 18:00 ` Frank Mayhar
2008-11-14 2:42 ` Roland McGrath
2008-11-14 16:41 ` Oleg Nesterov
2008-11-17 14:36 ` Oleg Nesterov
2008-11-17 18:16 ` Roland McGrath
2008-11-17 22:18 ` Oleg Nesterov
2008-11-17 21:49 ` Roland McGrath
2008-11-11 0:20 ` Ingo Oeser
2008-11-11 13:58 ` Christoph Lameter
2008-11-21 18:42 ` Petr Tesarik
2008-11-21 19:26 ` Frank Mayhar [this message]
2008-11-23 14:24 ` Peter Zijlstra
2008-11-24 8:46 ` Petr Tesarik
2008-11-24 9:33 ` Peter Zijlstra
2008-11-24 12:32 ` Petr Tesarik
2008-11-24 12:59 ` Peter Zijlstra
2008-11-24 16:06 ` Peter Zijlstra
2008-11-06 16:31 ` [PATCH] revert: " Peter Zijlstra
2008-11-06 21:44 ` Ingo Molnar
2008-11-06 21:53 ` Christoph Lameter
2008-11-07 10:19 ` Peter Zijlstra
2008-11-13 16:00 ` Doug Chapman
2008-11-13 16:08 ` Ingo Molnar
2008-11-14 14:10 ` Doug Chapman
[not found] <20081105191211.c0316b94.akpm@linux-foundation.org>
2008-11-06 12:59 ` regression introduced by - " Oleg Nesterov
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