linux-kernel - Re: [PATCH 4/7 V6] workqueue: fix idle worker depletion

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Message-ID: <20120908181107.GJ10788@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Sat, 8 Sep 2012 11:11:07 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Lai Jiangshan <eag0628@...il.com>
Cc:	Lai Jiangshan <laijs@...fujitsu.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/7 V6] workqueue: fix idle worker depletion

On Sun, Sep 09, 2012 at 02:07:50AM +0800, Lai Jiangshan wrote:
> when we release gcwq->lock and then grab it, we leave a hole that things
> can be changed.
> 
> I don't want to open a hole. if the hole has bug we have to fix it.
> if the hole has no bug, we have to add lot of comments to explain it.
> 
> When I write this reply. I am thinking: is the hole  has bug if
> I release gcwq->lock here? result: no. But I don't want to add all things
> what I have thought as comments to explain there is no bug even when we
> open a hole. don't leave reviewers too much burden.

We're already releasing gcwq->lock in maybe_create_worker().  That's
the reason why @ret is set to true.  In addition, we already released
the lock to grab manager_mutex.  So, you're not adding any burden.
Please reuse the busy rebinding mechanism.

Thanks.

-- 
tejun
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