Re: fast path cycle muncher (vmstat: make vmstat_updater deferrable again and shut down on idle)
From: Mike Galbraith
Date: Tue Jan 26 2016 - 12:39:34 EST
On Tue, 2016-01-26 at 10:26 -0600, Christoph Lameter wrote:
> On Tue, 26 Jan 2016, Mike Galbraith wrote:
> > On Tue, 2016-01-26 at 03:14 +0100, Mike Galbraith wrote:
> > > Perf and RT say we don't want quiet_vmstat() in the idle loop
> > > either.
> > BTW, the perf numbers were not from an RT kernel, they were from my
> > PREEMPT_VOLUNTARY desktop kernel.
> Can we move quiet_vmstat() elsewhere after we have checked that really
> nothing else is going on soon?
How would you check? Precognition doesn't work for mortals.