Re: [v7 0/8] Reduce cross CPU IPI interference

From: Paul E. McKenney
Date: Wed Feb 01 2012 - 13:41:36 EST

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:
> >
> 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

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.

Thanx, Paul

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