Re: [PATCH] workqueue: avoid nohz_full cores

[Frederic Weisbecker]

On Tue, Mar 31, 2015 at 03:25:59PM -0400, cmetcalf@xxxxxxxxxx wrote:
> From: Chris Metcalf <cmetcalf@xxxxxxxxxx>
> 
> When queuing work, we should avoid queuing it on the local cpu if
> we are using WORK_CPU_UNBOUND and the local cpu is nohz_full, since
> the workqueue will mean a later interrupt of the nohz_full process
> that presumably would prefer continuing to have 100% of the core
> without interrupts.
> 
> Likewise, remove the nohz_full cores from unbound workqueues.  If
> all the cores are nohz_full, we leave them in.
> 
> Signed-off-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>

Lai is already working on this: https://lkml.org/lkml/2015/3/12/27

All that will be needed after this patchset is to force the desired
unbound workqueue mask on boot.
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