Messages in this thread | | | Date | Tue, 31 Mar 2015 17:06:36 -0400 | From | Tejun Heo <> | Subject | Re: [PATCH] workqueue: avoid nohz_full cores |
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On Tue, Mar 31, 2015 at 10:58:41PM +0200, Frederic Weisbecker wrote: > On Tue, Mar 31, 2015 at 03:25:59PM -0400, cmetcalf@ezchip.com wrote: > > From: Chris Metcalf <cmetcalf@ezchip.com> > > > > 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@ezchip.com> > > 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.
This applies to per-cpu workqueues too, not just unbound workqueues.
Thanks.
-- tejun
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