From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx119.postini.com [74.125.245.119]) by kanga.kvack.org (Postfix) with SMTP id BACF06B0070 for ; Wed, 9 Jan 2013 03:18:29 -0500 (EST) Received: by mail-ia0-f169.google.com with SMTP id u20so1229412iag.14 for ; Wed, 09 Jan 2013 00:18:29 -0800 (PST) Message-ID: <1357719508.6568.5.camel@kernel.cn.ibm.com> Subject: Re: fadvise doesn't work well. From: Simon Jeons Date: Wed, 09 Jan 2013 02:18:28 -0600 In-Reply-To: <20130109080917.GA21056@localhost> References: <1357718721.6568.3.camel@kernel.cn.ibm.com> <20130109080917.GA21056@localhost> Content-Type: multipart/mixed; boundary="=-iilhlb0ZRWDKAoQjnskV" Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Fengguang Wu Cc: linux-mm@kvack.org, Andrew Morton , hughd@google.com, riel@redhat.com, Johannes Weiner , mtk.manpages@gmail.com --=-iilhlb0ZRWDKAoQjnskV Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit On Wed, 2013-01-09 at 16:09 +0800, Fengguang Wu wrote: > Hi Simon, > > Try run "sync" before doing fadvise, because fadvise won't drop > dirty/writeback/mapped pages. > Hi Fengguang, Thanks for your quick response. But the result is the same in attachment. > 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 The pages of ../../../images/ubuntu-11.04-desktop-i386.iso is mapped or unmapped? > > 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 > > > --=-iilhlb0ZRWDKAoQjnskV Content-Disposition: attachment; filename="11" Content-Type: text/plain; name="11"; charset="UTF-8" Content-Transfer-Encoding: 7bit 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, 35.5144 s, 20.2 MB/s root@hacker:~/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# sync 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 --=-iilhlb0ZRWDKAoQjnskV-- -- 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