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    SubjectRe: [v7 0/8] Reduce cross CPU IPI interference
    On Wed, Feb 01, 2012 at 02:06:07PM -0600, Christoph Lameter wrote:
    > On Wed, 1 Feb 2012, Paul E. McKenney wrote:
    >
    > > On Wed, Feb 01, 2012 at 06:35:22PM +0100, Peter Zijlstra wrote:
    > > > On Sun, 2012-01-29 at 10:25 +0200, Gilad Ben-Yossef wrote:
    > > > >
    > > > > If this is of interest, I keep a list tracking global IPI and global
    > > > > task schedulers sources in the core kernel here:
    > > > > https://github.com/gby/linux/wiki.
    > > >
    > > > You can add synchronize_.*_expedited() to the list, it does its best to
    > > > bash the entire machine in order to try and make RCU grace periods
    > > > happen fast.
    > >
    > > I have duly added "Make synchronize_sched_expedited() avoid IPIing idle
    > > CPUs" to http://kernel.org/pub/linux/kernel/people/paulmck/rcutodo.html.
    > >
    > > This should not be hard once I have built up some trust in the new
    > > RCU idle-detection code. It would also automatically apply to
    > > Frederic's dyntick-idle userspace work.
    >
    > Could we also apply the same approach to processors busy doing
    > computational work? In that case the OS is also not needed. Interrupting
    > these activities is impacting on performance and latency.

    Yep, that is in fact what Frederic's dyntick-idle userspace work does.

    Thanx, Paul



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