Date: Mon, 13 Jul 2009 11:58:03 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Shaohua Li <shaohua.li@intel.com>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, mel@csn.ul.ie, akpm@linux-foundation.org
Subject: Re: [PATCH] switch free memory back to MIGRATE_MOVABLE
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On Mon, 13 Jul 2009 11:47:46 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@jp.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@intel.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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