From: Fengguang Wu <fengguang.wu@intel.com>
To: Simon Jeons <simon.jeons@gmail.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
hughd@google.com, riel@redhat.com,
Johannes Weiner <hannes@cmpxchg.org>,
mtk.manpages@gmail.com
Subject: Re: fadvise doesn't work well.
Date: Wed, 9 Jan 2013 16:09:17 +0800 [thread overview]
Message-ID: <20130109080917.GA21056@localhost> (raw)
In-Reply-To: <1357718721.6568.3.camel@kernel.cn.ibm.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
>
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next prev parent reply other threads:[~2013-01-09 8:09 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-09 8:05 fadvise doesn't work well Simon Jeons
2013-01-09 8:09 ` Fengguang Wu [this message]
2013-01-09 8:18 ` Simon Jeons
2013-01-09 8:23 ` Fengguang Wu
2013-01-09 8:26 ` Fengguang Wu
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