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    SubjectRe: [PATCH 0/3] v2 Make hierarchical RCU less IPI-happy and add more tracing

    * Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

    > 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 tracing.
    >
    > Located-by: Anton Blanchard <anton@au1.ibm.com>
    > Tested-by: Anton Blanchard <anton@au1.ibm.com>
    > Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

    i've applied the first patch to tip:core/urgent (for .30) and the
    second and third one to tip:core/rcu (for .31).

    Thanks Paul,

    Ingo


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