linux-kernel - Re: [PATCH 2/2] memcg : rewrite percpu countings with new interfaces

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Date:	Mon, 9 Nov 2009 12:37:37 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	cl@...ux-foundation.org,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2/2] memcg : rewrite percpu countings with new
 interfaces

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-11-06 17:55:45]:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Now, alloc_percpu() alloc good dynamic allocations and
> Recent updates on percpu.h gives us following kind of ops 
>    - __this_cpu_add() etc...
> This is designed to be a help for reduce code size in hot-path
> and very useful to handle percpu area. Thanks for great works.
> 
> This patch rewrite memcg's (not-good) percpu status with new
> percpu support macros. This decreases code size and instruction
> size. By this, this area is now NUMA-aware and may have performance 
> benefit. 
> 
> I got good result in parallel pagefault test. (my host is 8cpu/2socket)
> 
> before==
>  Performance counter stats for './runpause.sh' (5 runs):
> 
>   474070.055912  task-clock-msecs         #      7.881 CPUs    ( +-   0.013% )
>        35829310  page-faults              #      0.076 M/sec   ( +-   0.217% )
>      3803016722  cache-references         #      8.022 M/sec   ( +-   0.215% )  (scaled from 100.00%)
>      1104083123  cache-misses             #      2.329 M/sec   ( +-   0.961% )  (scaled from 100.00%)
> 
>    60.154982314  seconds time elapsed   ( +-   0.018% )
> 
> after==
>  Performance counter stats for './runpause.sh' (5 runs):
> 
>   474919.429670  task-clock-msecs         #      7.896 CPUs    ( +-   0.013% )
>        36520440  page-faults              #      0.077 M/sec   ( +-   1.854% )
>      3109834751  cache-references         #      6.548 M/sec   ( +-   0.276% )
>      1053275160  cache-misses             #      2.218 M/sec   ( +-   0.036% )
> 
>    60.146585280  seconds time elapsed   ( +-   0.019% )
> 
> This test is affected by cpu-utilization but I think more improvements
> will be found in bigger system.
>

Hi, Kamezawa-San,

Could you please post the IPC results as well? 

-- 
	Balbir
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