linux-kernel - Re: [RFC PATCH 0/5] Support multiple pages allocation

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Message-ID: <51D44AE7.1090701@gmail.com>
Date:	Thu, 04 Jul 2013 00:01:43 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Glauber Costa <glommer@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>
Subject: Re: [RFC PATCH 0/5] Support multiple pages allocation

On 07/03/2013 11:51 PM, Zhang Yanfei wrote:
> On 07/03/2013 11:28 PM, Michal Hocko wrote:
>> On Wed 03-07-13 17:34:15, Joonsoo Kim wrote:
>> [...]
>>> For one page allocation at once, this patchset makes allocator slower than
>>> before (-5%). 
>>
>> Slowing down the most used path is a no-go. Where does this slow down
>> come from?
> 
> I guess, it might be: for one page allocation at once, comparing to the original
> code, this patch adds two parameters nr_pages and pages and will do extra checks
> for the parameter nr_pages in the allocation path.
> 

If so, adding a separate path for the multiple allocations seems better.

>>
>> [...]
> 
> 


-- 
Thanks.
Zhang Yanfei
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