linux-kernel - Re: [PATCH v2 1/2] rcu: don't bind offline cpu

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Message-ID: <4DD4D9EB.2040603@jp.fujitsu.com>
Date:	Thu, 19 May 2011 17:50:51 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	a.p.zijlstra@...llo.nl
CC:	yong.zhang0@...il.com, paulmck@...ux.vnet.ibm.com, oleg@...hat.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, lizf@...fujitsu.com, miaox@...fujitsu.com
Subject: Re: [PATCH v2 1/2] rcu: don't bind offline cpu

(2011/05/19 17:34), Peter Zijlstra wrote:
> On Thu, 2011-05-19 at 15:06 +0900, KOSAKI Motohiro wrote:
>>
>> The right way is, explicit two phase cpu bindings (1) bind boot
>> (or any other online) cpu at CPU_UP_PREPARE (2) bind correct
>> target cpu at CPU_ONLINE. This patch does it.
>
> I'm not sure that is in-fact correct. From what I understood, RCU could
> have need of this thread before the ONLINE callback and expects it to be
> affine at that time.
>
> What was wrong with delaying the wakeup to STARTING?

Grr, I misparsed Paul's mail. I thought he said "Sorry, but this does not work."
to you. But in fact, he said to Young. I have to see and test your patch.

I'm sorry. Please give me a bit time.

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