linux-kernel - Re: [PATCH] switch free memory back to MIGRATE

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Message-Id: <20090713115803.b78a4f4f.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 13 Jul 2009 11:58:03 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Shaohua Li <shaohua.li@...el.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, mel@....ul.ie, akpm@...ux-foundation.org
Subject: Re: [PATCH] switch free memory back to MIGRATE_MOVABLE

On Mon, 13 Jul 2009 11:47:46 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > When page is back to buddy and its order is bigger than pageblock_order, we can
> > switch its type to MIGRATE_MOVABLE. This can reduce fragmentation. The patch
> > has obvious effect when read a block device and then drop caches.
> > 
> > Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> 
> This patch change hot path, but there is no performance mesurement description.
> Also, I don't like modification buddy core for only drop caches.
> 
Li, does this patch imply fallback of migration type doesn't work well ?
What is the bad case ?

-Kame

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