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

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Date:	Sun, 9 Sep 2012 02:07:50 +0800
From:	Lai Jiangshan <eag0628@...il.com>
To:	Tejun Heo <tj@...nel.org>
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 9, 2012 at 1:53 AM, Tejun Heo <tj@...nel.org> wrote:
> Hello,
>
> On Sun, Sep 09, 2012 at 01:50:41AM +0800, Lai Jiangshan wrote:
>> >> +             if (worker_maybe_bind_and_lock(manager))
>> >> +                     worker_clr_flags(manager, WORKER_UNBOUND);
>> >> +     }
>> >> +}
>> >
>> > We can reuse busy_worker_rebind_fn(), right?
>>
>> busy_worker_rebind_fn() releases the gcwq->lock. we can't release
>> the lock here.
>
> Why so?  Can you please elaborate?
>

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.

Thanks.
Lai.

>
> --
> tejun
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