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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