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    SubjectRe: [PATCH tip/core/rcu 07/86] rcu: Force per-rcu_node kthreads off of the outgoing CPU
    On Sun, May 01, 2011 at 06:20:47AM -0700, Paul E. McKenney wrote:
    > From: Paul E. McKenney <>
    > The scheduler has had some heartburn in the past when too many real-time
    > kthreads were affinitied to the outgoing CPU. So, this commit lightens
    > the load by forcing the per-rcu_node and the boost kthreads off of the
    > outgoing CPU. Note that RCU's per-CPU kthread remains on the outgoing
    > CPU until the bitter end, as it must in order to preserve correctness.
    > Also avoid disabling hardirqs across calls to set_cpus_allowed_ptr(),
    > given that this function can block.

    This seems like two separate changes in one patch. The change to
    kernel/rcutree_plugin.h seems entirely separable from the change to
    kernel/rcutree.c here.

    > Signed-off-by: Paul E. McKenney <>
    > Signed-off-by: Paul E. McKenney <>

    Heh, amusingly this actually seems meaningful, if you intend it as a
    "role" approval.

    - Josh Triplett

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