linux-kernel - Re: [PATCH 3/9 V3] workqueue: add POOL_MANAGING

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Date:	Wed, 29 Aug 2012 11:21:02 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9 V3] workqueue: add POOL_MANAGING_WORKERS

Hello, Lai.

On Thu, Aug 30, 2012 at 12:51:54AM +0800, Lai Jiangshan wrote:
> When hotplug happens, the plug code will also grab the manager_mutex,
> it will break too_many_workers()'s assumption, and make too_many_workers()
> ugly(kick the timer wrongly, no found bug).
> 
> To avoid assumption-coruption, we add the original POOL_MANAGING_WORKERS back.

I don't think we're gaining anything with this and I'd like to confine
management state within the mutex only.  If too_many_workers() firing
spuriously while CPU up/down is in progress, just add a comment
explaining why it's a non-problem (actual worker management never
happens while cpu up/down holds manager positions).

Thanks.

-- 
tejun
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