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

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Date:	Tue, 26 Jan 2016 18:39:21 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Michal Hocko <mhocko@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: fast path cycle muncher (vmstat: make vmstat_updater deferrable
 again and shut down on idle)

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.

	-Mike