linux-kernel - Re: [patch] workqueue: schedule WORK_CPU_UNBOUND work on wq_unbound

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Message-ID: <20150722141148.GL15934@mtj.duckdns.org>
Date:	Wed, 22 Jul 2015 10:11:48 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Lai Jiangshan <jiangshanlai@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>
Subject: Re: [patch] workqueue: schedule WORK_CPU_UNBOUND work on
 wq_unbound_cpumask CPUs

On Wed, Jul 22, 2015 at 07:24:46AM +0200, Mike Galbraith wrote:
> WORK_CPU_UNBOUND work items queued to a bound workqueue always run
> locally.  This is a good thing normally, but not when the user has

The constant name used there is a bit misleading but you can't put
work items which are queued w/ queue_work() on foreign cpus by
default.  queue_work() has always guaranteed local execution.  The
problem is that workqueue can't currently tell whether a queue_work()
user expects cpu locality for correctness or optimization.  It'd be
great if we introduce queue_work_on_local() or sth and replace
correctness ones with it but that involves auditing each and every
queue_work() usage.  If anybody is up for the task, I'd be happy to
help.

Thanks.

-- 
tejun
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