Message-ID: <51D44890.4080003@gmail.com>
Date: Wed, 03 Jul 2013 23:51:44 +0800
From: Zhang Yanfei <zhangyanfei.yes@gmail.com>
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To: Michal Hocko <mhocko@suse.cz>
CC: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>, David Rientjes <rientjes@google.com>,
        Glauber Costa <glommer@gmail.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>,
        Minchan Kim <minchan@kernel.org>, Jiang Liu <jiang.liu@huawei.com>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Joonsoo Kim <js1304@gmail.com>
Subject: Re: [RFC PATCH 0/5] Support multiple pages allocation
References: <1372840460-5571-1-git-send-email-iamjoonsoo.kim@lge.com> <20130703152824.GB30267@dhcp22.suse.cz>
In-Reply-To: <20130703152824.GB30267@dhcp22.suse.cz>
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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.

> 
> [...]


-- 
Thanks.
Zhang Yanfei
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