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

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Message-ID: <alpine.DEB.2.20.1601261026250.27995@east.gentwo.org>
Date:	Tue, 26 Jan 2016 10:26:54 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Mike Galbraith <umgwanakikbuti@...il.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, 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?