From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Uf3eN-0001Eh-4o for kexec@lists.infradead.org; Wed, 22 May 2013 07:39:56 +0000 Received: from m2.gw.fujitsu.co.jp (unknown [10.0.50.72]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id D0C0F3EE0AE for ; Wed, 22 May 2013 16:39:29 +0900 (JST) Received: from smail (m2 [127.0.0.1]) by outgoing.m2.gw.fujitsu.co.jp (Postfix) with ESMTP id C0EDA45DE52 for ; Wed, 22 May 2013 16:39:29 +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 AAC6D45DDCF for ; Wed, 22 May 2013 16:39:29 +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 9B6DC1DB8043 for ; Wed, 22 May 2013 16:39:29 +0900 (JST) Received: from m1000.s.css.fujitsu.com (m1000.s.css.fujitsu.com [10.240.81.136]) by s2.gw.fujitsu.co.jp (Postfix) with ESMTP id 5331B1DB803E for ; Wed, 22 May 2013 16:39:29 +0900 (JST) Message-ID: <519C7610.6090709@jp.fujitsu.com> Date: Wed, 22 May 2013 16:38:56 +0900 From: HATAYAMA Daisuke MIME-Version: 1.0 Subject: Re: [PATCH] makedumpfile: turn off mmap for free page scan References: <20130522155712.0940be98ced5e3bcfde55acd@mxc.nes.nec.co.jp> In-Reply-To: <20130522155712.0940be98ced5e3bcfde55acd@mxc.nes.nec.co.jp> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: cpw@sgi.com Cc: kexec@lists.infradead.org, Atsushi Kumagai (2013/05/22 15:57), Atsushi Kumagai wrote: > On Wed, 15 May 2013 13:43:59 -0500 > Cliff Wickman wrote: > >> From: Cliff Wickman >> >> Because addresses of each successive page structure are often descending >> it is much faster to use read()'s, so set off info->flag_usemmap >> while doing exclude_free_page(). >> >> Signed-off-by: Cliff Wickman > > Sounds good. > BTW, do you have a speed measurement like your another patch ? > Also how about keeping mmap mode and reducing mapping size temporarily to 4KiB? >> I find this to speed the scan of page structures for a 1TB system from >> 60sec to 30sec. I don't know which this measured time indicates. Only free pages filtering or free pages filtering plus unnecessary pages filtering? -- Thanks. HATAYAMA, Daisuke _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec