linux-kernel - Re: [PATCHSET] workqueue: reimplement CPU hotplug to keep idle workers

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Date:	Fri, 20 Jul 2012 18:39:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, linux-pm@...r.kernel.org
Subject: Re: [PATCHSET] workqueue: reimplement CPU hotplug to keep idle
 workers

On Tue, 2012-07-17 at 10:12 -0700, Tejun Heo wrote:
> Currently, workqueue destroys all workers for offline CPUs unless
> there are lingering work items. 

_that_ is the root of all ugly in that thing. I still find it utterly
insane you can create 'per-cpu' workqueues and then violate the per-cpu
property with hotplug and get your work ran on a different CPU.

It should be a hard error to use queue_work_on() and then run the work
on a different cpu. Yet somehow this isn't so.
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