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    Subject[PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and add more tracing
    This three-patch set fixes a hierarchical-RCU performance bug located
    by Anton Blanchard. This bug affects certain high-end floating-point
    computation-heavy workloads with closely spaced barrier-synchronized
    iterations, where an interruption of any one CPU's processing during a
    given iteration slows the system as a whole. This bug manifests itself
    as excessive resched IPIs, and is strictly a performance regression.
    It does not affect correctness.

    The first patch provides the fix for the problem, the second patch
    adds the tracing, and the third patch adds the documentation for the

    Located-by: Anton Blanchard <>
    Tested-by: Anton Blanchard <>
    Signed-off-by: Paul E. McKenney <>

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      Last update: 2009-04-14 07:03    [W:0.033 / U:185.576 seconds]
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