Re: [PATCH RESEND] sched/nohz: Affine unpinned timers to housekeepers

From: Ingo Molnar
Date: Mon Aug 24 2015 - 03:41:50 EST

* Mike Galbraith <umgwanakikbuti@xxxxxxxxx> wrote:

> On Mon, 2015-08-24 at 08:44 +0200, Ingo Molnar wrote:
> > the 'housekeeping CPU' is essentially the boot CPU. Yet we dedicate a full mask to
> > it (housekeeping_mask - a variable mask to begin with) and recover the
> > housekeeping CPU via:
> >
> > + return cpumask_any_and(housekeeping_mask, cpu_online_mask);
> There can be, and had better be if box is big, multiple housekeepers.

Yes - but that does not seem to be possible via the code right now AFAICS, so at
minimum it's incomplete.


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