From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with ESMTP id 889566B0071 for ; Tue, 12 Jan 2010 02:36:38 -0500 (EST) Received: from wpaz37.hot.corp.google.com (wpaz37.hot.corp.google.com [172.24.198.101]) by smtp-out.google.com with ESMTP id o0C7aYXg010369 for ; Mon, 11 Jan 2010 23:36:34 -0800 Received: from pwi20 (pwi20.prod.google.com [10.241.219.20]) by wpaz37.hot.corp.google.com with ESMTP id o0C7a60g027392 for ; Mon, 11 Jan 2010 23:36:33 -0800 Received: by pwi20 with SMTP id 20so2047886pwi.9 for ; Mon, 11 Jan 2010 23:36:33 -0800 (PST) Date: Mon, 11 Jan 2010 23:36:25 -0800 (PST) From: David Rientjes Subject: Re: [PATCH 4/4] mm/page_alloc : relieve zone->lock's pressure for memory free In-Reply-To: <20100112140923.B3A4.A69D9226@jp.fujitsu.com> Message-ID: References: <20100112042116.GA26035@localhost> <20100112133223.005b81ed.kamezawa.hiroyu@jp.fujitsu.com> <20100112140923.B3A4.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: KAMEZAWA Hiroyuki , Wu Fengguang , Minchan Kim , Huang Shijie , Andrew Morton , Mel Gorman , linux-mm@kvack.org, Rik van Riel List-ID: On Tue, 12 Jan 2010, KOSAKI Motohiro wrote: > From 751f197ad256c7245151681d7aece591b1dab343 Mon Sep 17 00:00:00 2001 > From: KOSAKI Motohiro > Date: Tue, 12 Jan 2010 13:53:47 +0900 > Subject: [PATCH] mm: Restore zone->all_unreclaimable to independence word > > commit e815af95 (change all_unreclaimable zone member to flags) chage > all_unreclaimable member to bit flag. but It have undesireble side > effect. > free_one_page() is one of most hot path in linux kernel and increasing > atomic ops in it can reduce kernel performance a bit. > Could you please elaborate on "a bit" in the changelog with some data? If it's so egregious, it should be easily be quantifiable. -- 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