linux-kernel - Re: [PATCH v5 4.5/7] mm: optimize isolate_lru

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Date:	Tue, 13 Mar 2012 14:26:35 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <jweiner@...hat.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4.5/7] mm: optimize isolate_lru_pages()

On Sun, 11 Mar 2012 18:36:16 +0400
Konstantin Khlebnikov <khlebnikov@...nvz.org> wrote:

> This patch moves lru checks from __isolate_lru_page() to its callers.
> 
> They aren't required on non-lumpy reclaim: all pages are came from right lru.
> Pages isolation on memory compaction should skip only unevictable pages.
> Thus we need to check page lru only on pages isolation for lumpy-reclaim.
> 
> Plus this patch kills mem_cgroup_lru_del() and uses mem_cgroup_lru_del_list()
> instead, because now we already have lru list index.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
> 
> add/remove: 0/1 grow/shrink: 2/1 up/down: 101/-164 (-63)
> function                                     old     new   delta
> static.isolate_lru_pages                    1018    1103     +85
> compact_zone                                2230    2246     +16
> mem_cgroup_lru_del                            65       -     -65
> __isolate_lru_page                           287     188     -99


Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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