Re: [PATCH] perf_counter: Provide functions for locking andpinning the context for a task

[Ingo Molnar]

* Paul Mackerras <paulus@xxxxxxxxx> 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
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