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    SubjectRe: [PATCH 2/2] perf_counter: optimize context switch between identical inherited contexts
    Peter Zijlstra writes:

    > Ingo just pointed out that there is nothing there to close the race with
    > attaching a counter.
    > That is, you could end up attaching your counter to the wrong task.

    Good point. Doing the unclone in find_get_context would be a start,
    but the locking could get tricky (in fact we don't have any way to
    remove an inherited counter from a context, so we only have to worry
    about counters being attached). I'll work out a solution after I have
    digested your recent batch of patches.


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      Last update: 2009-05-25 02:37    [W:0.018 / U:1.148 seconds]
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