linux-kernel - Re: regression introduced by - timers: fix itimer/many thread hang

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Message-Id: <1227295563.21605.13.camel@bobble.smo.corp.google.com>
Date:	Fri, 21 Nov 2008 11:26:03 -0800
From:	Frank Mayhar <fmayhar@...gle.com>
To:	Petr Tesarik <ptesarik@...e.cz>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Doug Chapman <doug.chapman@...com>, mingo@...e.hu,
	roland@...hat.com, adobriyan@...il.com, akpm@...ux-foundation.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: regression introduced by - timers: fix itimer/many thread hang

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@...gle.com>
Google, Inc.

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