linux-kernel - Re: [PATCH] vmstat: make vmstat_update deferrable (was: Re: [PATCH] mm, vmstat: make quiet_vmstat lighter) path cycle muncher (vmstat: make vmstat_updater deferrable) again and shut down on idle)

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Date:	Thu, 28 Jan 2016 10:48:09 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	akpm@...ux-foundation.org, Michal Hocko <mhocko@...nel.org>
cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmstat: make vmstat_update deferrable (was: Re: [PATCH]
 mm, vmstat: make quiet_vmstat lighter) path cycle muncher (vmstat: make
 vmstat_updater deferrable) again and shut down on idle)

On Thu, 28 Jan 2016, Michal Hocko wrote:

> down on idle") made vmstat_shepherd deferrable. vmstat_update itself
> is still using standard timer which might interrupt idle task. This
> is possible because "mm, vmstat: make quiet_vmstat lighter" removed
> cancel_delayed_work from the quiet_vmstat. Change vmstat_work to
> use DEFERRABLE_WORK to prevent from pointless wakeups from the idle
> context.

Acked-by: Christoph Lameter <cl@...ux.com>