From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx170.postini.com [74.125.245.170]) by kanga.kvack.org (Postfix) with SMTP id 4D7C36B0062 for ; Wed, 9 Jan 2013 03:09:31 -0500 (EST) Date: Wed, 9 Jan 2013 16:09:17 +0800 From: Fengguang Wu Subject: Re: fadvise doesn't work well. Message-ID: <20130109080917.GA21056@localhost> References: <1357718721.6568.3.camel@kernel.cn.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1357718721.6568.3.camel@kernel.cn.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Simon Jeons Cc: linux-mm@kvack.org, Andrew Morton , hughd@google.com, riel@redhat.com, Johannes Weiner , mtk.manpages@gmail.com Hi Simon, Try run "sync" before doing fadvise, because fadvise won't drop dirty/writeback/mapped pages. Thanks, Fengguang On Wed, Jan 09, 2013 at 02:05:21AM -0600, Simon Jeons wrote: > In attanchment. > root@kernel:~/Documents/mm/tools/linux-ftools# dd if=../../../images/ubuntu-11.04-desktop-i386.iso of=/tmpfs > 1403484+0 records in > 1403484+0 records out > 718583808 bytes (719 MB) copied, 19.5054 s, 36.8 MB/s > root@kernel:~/Documents/mm/tools/linux-ftools# ./linux-fincore -s ../../../images/ubuntu-11.04-desktop-i386.iso > filename size total_pages min_cached page cached_pages cached_size cached_perc > -------- ---- ----------- --------------- ------------ ----------- ----------- > ../../../images/ubuntu-11.04-desktop-i386.iso 718583808 175436 0 175436 718585856 100.00 > --- > total cached size: 718585856 > root@kernel:~/Documents/mm/tools/linux-ftools# ./linux-fadvise ../../../images/ubuntu-11.04-desktop-i386.iso DONTNEED 0,718585856 > Going to fadvise ../../../images/ubuntu-11.04-desktop-i386.iso as mode DONTNEED > offset: 0 > length: 718583808 > Invalid mode DONTNEED > root@kernel:~/Documents/mm/tools/linux-ftools# ./linux-fincore -s ../../../images/ubuntu-11.04-desktop-i386.iso > filename size total_pages min_cached page cached_pages cached_size cached_perc > -------- ---- ----------- --------------- ------------ ----------- ----------- > ../../../images/ubuntu-11.04-desktop-i386.iso 718583808 175436 0 175436 718585856 100.00 > --- > total cached size: 718585856 > -- 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