linux-kernel - Re: [PATCH] workqueue: clear workers of a pool after the CPU is offline

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Message-ID: <20130726102240.GA30786@mtj.dyndns.org>
Date:	Fri, 26 Jul 2013 06:22:40 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: clear workers of a pool after the CPU is
 offline

On Fri, Jul 26, 2013 at 11:47:04AM +0800, Lai Jiangshan wrote:
> any worker can't kill itself.
> managers always tries to leave 2 workers.
> 
> so the workers of the offline cpu pool can't be totally destroyed.

But we *do* want to keep them around as CPUs taken offline are likely
to come online at some point and destroying all of them saves only
~16k of memory while adding more work while CPUs are on/offlined which
can be very frequent on mobile devices.  The change was *intentional*.

Thanks.

-- 
tejun
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