Re: fast path cycle muncher (vmstat: make vmstat_updater deferrable again and shut down on idle)

From: Frederic Weisbecker
Date: Thu Jan 28 2016 - 10:37:07 EST

On Wed, Jan 27, 2016 at 10:28:48AM -0600, Christoph Lameter wrote:
> On Wed, 27 Jan 2016, Mike Galbraith wrote:
> > > Since we (the NOHZ people) care mostly about NOHZ then lets restrict
> > > that to the NOHZ mode. Then it should not affect your load.
> >
> > Tons of folks do have NO_HZ enabled (including me). Isn't there a spot
> > somewhere in NO_HZ_FULL code where it can take up residence? (one with
> > a tad lower maximum call frequency would be good, a nohz_full cpu isn't
> > necessarily being used for pure compute exclusively)
> Frederic, any idea on where to put quiet_vmstat()?

I guess those who want this also want task isolation, right? And Chris integrates
it in his patchset.