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

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Message-ID: <CACvQF52TC4L58WwvhJ9sYiBj2vFdLG2iCb5Fvs2a8Ti19DpAWA@mail.gmail.com>
Date:	Sat, 27 Jul 2013 00:55:12 +0800
From:	Lai Jiangshan <eag0628@...il.com>
To:	Tejun Heo <tj@...nel.org>, 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 6:22 PM, Tejun Heo <tj@...nel.org> wrote:
> 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

4 threads, (normal and high priority wq)
~32k
it is still small.

> can be very frequent on mobile devices.  The change was *intentional*.

but sometimes the cpu is offline for long time.
and maybe the adminstrator want to reclaim the resource..

Add a boot option or sysfs switch?

>
> Thanks.
>
> --
> tejun
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