From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id 5183D6B004F for ; Sun, 12 Jul 2009 22:40:04 -0400 (EDT) Received: from m2.gw.fujitsu.co.jp ([10.0.50.72]) by fgwmail7.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id n6D2xpQV005936 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Mon, 13 Jul 2009 11:59:51 +0900 Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 8172445DE4F for ; Mon, 13 Jul 2009 11:59:50 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (s2.gw.fujitsu.co.jp [10.0.50.92]) by m2.gw.fujitsu.co.jp (Postfix) with ESMTP id 5F86245DE4E for ; Mon, 13 Jul 2009 11:59:50 +0900 (JST) Received: from s2.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 080251DB803F for ; Mon, 13 Jul 2009 11:59:50 +0900 (JST) Received: from m107.s.css.fujitsu.com (m107.s.css.fujitsu.com [10.249.87.107]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id B3D72E38001 for ; Mon, 13 Jul 2009 11:59:49 +0900 (JST) Date: Mon, 13 Jul 2009 11:58:03 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [PATCH] switch free memory back to MIGRATE_MOVABLE Message-Id: <20090713115803.b78a4f4f.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20090713113326.624F.A69D9226@jp.fujitsu.com> References: <20090713023030.GA27269@sli10-desk.sh.intel.com> <20090713113326.624F.A69D9226@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: Shaohua Li , linux-kernel@vger.kernel.org, linux-mm@kvack.org, mel@csn.ul.ie, akpm@linux-foundation.org List-ID: On Mon, 13 Jul 2009 11:47:46 +0900 (JST) KOSAKI Motohiro 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 > > 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org