linux-kernel - Re: Re: [PATCH 10/25] kprobes: fix wait_for_kprobe

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Message-ID: <5107B82E.4020403@hitachi.com>
Date:	Tue, 29 Jan 2013 20:53:18 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: Re: [PATCH 10/25] kprobes: fix wait_for_kprobe_optimizer()

(2013/01/29 4:49), Tejun Heo wrote:
> On Tue, Dec 25, 2012 at 12:51:37PM +0900, Masami Hiramatsu wrote:
>> (2012/12/22 10:57), Tejun Heo wrote:
>>> wait_for_kprobe_optimizer() seems largely broken.  It uses
>>> optimizer_comp which is never re-initialized, so
>>> wait_for_kprobe_optimizer() will never wait for anything once
>>> kprobe_optimizer() finishes all pending jobs for the first time.
>>
>> Thank you for fixing that!
>> I must misunderstand that the DECLARE_COMPLETION() macro.
>>
>>> Also, aside from completion, delayed_work_pending() is %false once
>>> kprobe_optimizer() starts execution and wait_for_kprobe_optimizer()
>>> won't wait for it.
>>>
>>> Reimplement it so that it flushes optimizing_work until
>>> [un]optimizing_lists are empty.  Note that this also makes
>>> optimizing_work execute immediately if someone's waiting for it, which
>>> is the nicer behavior.
>>
>> I think your enhancement is reasonable and GOOD for me.
>>
>> Thanks again!
>>
>> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> Can I take it through workqueue branch w/ other patches?

Yes, of course. I think it is not a critical bug, so I can
wait for other patches.

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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