From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 301766B004D for ; Tue, 19 May 2009 02:52:45 -0400 (EDT) Date: Tue, 19 May 2009 14:27:58 +0800 From: Wu Fengguang Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen Message-ID: <20090519062757.GA9639@localhost> References: <20090519032759.GA7608@localhost> <20090519133422.4ECC.A69D9226@jp.fujitsu.com> <20090519050932.GB8769@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090519050932.GB8769@localhost> Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: Christoph Lameter , Andrew Morton , LKML , Elladan , Nick Piggin , Johannes Weiner , Peter Zijlstra , Rik van Riel , "tytso@mit.edu" , "linux-mm@kvack.org" , "minchan.kim@gmail.com" List-ID: On Tue, May 19, 2009 at 01:09:32PM +0800, Wu Fengguang wrote: > On Tue, May 19, 2009 at 12:41:38PM +0800, KOSAKI Motohiro wrote: > Note that I was creating the sparse file in btrfs, which happens to be > very slow in sparse file reading: > > 151.194384MB/s 284.198252s 100001x 450560b --load pattern-hot-10 --play /b/sparse > > In that case, the inactive list is rotated at the speed of 250MB/s, > so a full scan of which takes about 3.5 seconds, while a full scan > of active file list takes about 77 seconds. Hi KOSAKI: you can limit the read speed with iotrace.rb's "--think-time" option, or to read the sparse file over network. Thanks, Fengguang -- 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