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From: Ingo Molnar <mingo@elte.hu>
To: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf_counter: Provide functions for locking and pinning the context for a task
Date: Tue, 2 Jun 2009 01:14:28 +0200	[thread overview]
Message-ID: <20090601231428.GF749@elte.hu> (raw)
In-Reply-To: <18980.19019.158462.125715@cargo.ozlabs.ibm.com>


* Paul Mackerras <paulus@samba.org> wrote:

> Ingo Molnar writes:
> 
> > -tip testing found that these patches are causing a crash:
> 
> Argh.  What was userspace doing at the time of the crash, do you 
> know? It looks like it might have been on/off-lining a cpu, 
> judging by the stack trace.  Would there have been any counters 
> attached to the task doing there, or were there any per-cpu 
> counters active?

Yeah, indeed that box has a CPU hotplug testcase - sets cpu1 to 
offline then online.

There should be no counters active anywhere during that.

	Ingo

  reply	other threads:[~2009-06-01 23:14 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-01  7:48 [PATCH] perf_counter: Provide functions for locking and pinning the context for a task Paul Mackerras
2009-06-01  7:49 ` [PATCH] perf_counter: Allow software counters to count while task is not running Paul Mackerras
2009-06-01  8:19   ` [tip:perfcounters/core] " tip-bot for Paul Mackerras
2009-06-01  7:52 ` [PATCH] perf_counter: Fix cpu migration counter Paul Mackerras
2009-06-01  8:19   ` [tip:perfcounters/core] " tip-bot for Paul Mackerras
2009-06-02 14:18   ` tip-bot for Paul Mackerras
2009-06-01  7:53 ` [PATCH] perf_counter: Remove unused prev_state field Paul Mackerras
2009-06-01  8:19   ` [tip:perfcounters/core] " tip-bot for Paul Mackerras
2009-06-02 14:18   ` tip-bot for Paul Mackerras
2009-06-01  7:55 ` [PATCH] perf_counter: Provide functions for locking and pinning the context for a task Paul Mackerras
2009-06-01 16:21   ` Ingo Molnar
2009-06-01 21:38     ` Paul Mackerras
2009-06-01 23:14       ` Ingo Molnar [this message]
2009-06-02  5:37         ` Paul Mackerras
2009-06-02  7:56           ` Ingo Molnar
2009-06-01  8:18 ` [tip:perfcounters/core] " tip-bot for Paul Mackerras

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