Messages in this thread | | | Date | Sun, 1 Nov 2009 21:38:39 -0800 | From | Arjan van de Ven <> | Subject | Re: [PATCH 1/6] perf/core: Provide a kernel-internal interface to get to performance counters |
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On Mon, 2 Nov 2009 14:46:55 +1100 Paul Mackerras <paulus@samba.org> wrote:
> Frederic Weisbecker writes: > > > /* > > + * perf_event_create_kernel_counter > > + * MUST be called from a kernel thread. > > Why? The reason for this requirement isn't obvious to me. It would > be good to have the reason documented in the comment for the sake of > people modifying the code in future.
because if you call it from another context it will attach to that context... and go away when that context goes away...
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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