linux-kernel - Re: [PATCH] aio: optimize free kioctx slot search

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Message-ID: <52BD5738.4010308@cn.fujitsu.com>
Date:	Fri, 27 Dec 2013 18:32:24 +0800
From:	Gu Zheng <guz.fnst@...fujitsu.com>
To:	Matthew Wilcox <matthew@....cx>
CC:	Benjamin <bcrl@...ck.org>, linux-aio@...ck.org,
	fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] aio: optimize free kioctx slot search

Hi Matthew,
On 12/26/2013 10:13 PM, Matthew Wilcox wrote:

> On Thu, Dec 26, 2013 at 06:22:10PM +0800, Gu Zheng wrote:
>> to the new free slot if it's smaller than 'next_free'. So that we can
>> ensure that the slots before 'next_free' are all used, and the search can start
>> from 'next_free' to reduce the search and improve the performance.
> 
> Have you benchmarked it?  What kinds of improvements are you seeing?

Not yet. But the improvement is obvious, we can always reduce the search region and
improve the hit rate when trying to find a free slot with this change.

Regards,
Gu

> 


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