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    SubjectRe: [PATCH 1/6] perf/core: Provide a kernel-internal interface to get to performance counters
    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...



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