linux-kernel - Re: [PATCH v2 2/2] mm: add sysctl to pick vmstat monitor cpu

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Message-ID: <0000013f61e10d68-d5ca253d-d14f-4547-8291-aafa6b596ed7-000000@email.amazonses.com>
Date:	Thu, 20 Jun 2013 13:58:27 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v2 2/2] mm: add sysctl to pick vmstat monitor cpu

On Wed, 19 Jun 2013, Gilad Ben-Yossef wrote:

> Add a sysctl knob to enable admin to hand pick the scapegoat cpu
> that will perform the extra work of preiodically checking for
> new VM activity on CPUs that have switched off their vmstat_update
> work item schedling.

Not necessary if we use the dynticks sacrificial processor
(boot cpu). Seems to be also used for RCU.

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