linux-kernel - Re: [PATCH] CPU hotplug, writeback: Don't call writeback_set

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Message-ID: <5065B84F.6060204@linux.vnet.ibm.com>
Date:	Fri, 28 Sep 2012 20:16:39 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	Borislav Petkov <bp@...64.org>,
	Conny Seidel <conny.seidel@....com>, Jan Kara <jack@...e.cz>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <jweiner@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] CPU hotplug, writeback: Don't call writeback_set_ratelimit()
 too often during hotplug

On 09/28/2012 05:57 PM, Fengguang Wu wrote:
> On Tue, Sep 25, 2012 at 02:18:20AM +0530, Srivatsa S. Bhat wrote:
>>
>> From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
>>
>> The CPU hotplug callback related to writeback calls writeback_set_ratelimit()
>> during every state change in the hotplug sequence. This is unnecessary
>> since num_online_cpus() changes only once during the entire hotplug operation.
>>
>> So invoke the function only once per hotplug, thereby avoiding the
>> unnecessary repetition of those costly calculations.
>>
>> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
>> ---
> 
> Looks good to me. I'll include it in the writeback tree.
> 

Great, thanks!
 
Regards,
Srivatsa S. Bhat

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