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

Ingo Molnar
2009-06-01T23:14:42Z

* 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