[lkml]   [2015]   [Apr]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] workqueue: avoid nohz_full cores
On Wed, Apr 01, 2015 at 09:56:07AM +0200, Peter Zijlstra wrote:
> > The problem with this is that workqueue currently doesn't distinguish
> > why work items are queued on per-cpu workqueues. It can't tell
> > whether being bound to local CPU is for correctness or optimization
> > and thus can't break local execution guarantee for anybody. We need
> > to hunt down all the ones which depend on local execution and annotate
> > them with explicit queue_work_on() before being able to do this.
> This is moot on unbound workqueues, they can run wherever so it can
> never be a correctness thing, right?

The posted patch applies to both unbound and per-cpu workqueues.
There's a more comprehensive patchset currently being worked on by Lai
for unbound workqueues.



 \ /
  Last update: 2015-04-01 18:21    [W:0.026 / U:0.392 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site