linux-kernel - Re: [PATCH 0/4] memcg: simplify LRU handling.

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Date:	Mon, 19 Dec 2011 16:56:13 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 0/4] memcg: simplify LRU handling.

On Wed, Dec 14, 2011 at 04:47:34PM +0900, KAMEZAWA Hiroyuki wrote:
> 
> This series is onto linux-next + 
> memcg-add-mem_cgroup_replace_page_cache-to-fix-lru-issue.patch
> 
> The 1st purpose of this patch is reduce overheads of mem_cgroup_add/del_lru.
> They uses some atomic ops.

Which is noticable.

With a simple sparse file cat, mem_cgroup_lru_add_list() went from

     1.12%      cat  [kernel.kallsyms]    [k] mem_cgroup_lru_add_list

to

     0.31%      cat  [kernel.kallsyms]    [k] mem_cgroup_lru_add_list

and real time went down, too:

5 runs		min	median	max	in seconds
vanilla:	7.762	7.782	7.816
patched:	7.622	7.631	7.660
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