From: Simon Jeons <simon.jeons@gmail.com>
To: Fengguang Wu <fengguang.wu@intel.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, 09 Jan 2013 02:18:28 -0600 [thread overview]
Message-ID: <1357719508.6568.5.camel@kernel.cn.ibm.com> (raw)
In-Reply-To: <20130109080917.GA21056@localhost>
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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
> >
>
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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
next prev parent reply other threads:[~2013-01-09 8:18 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
2013-01-09 8:18 ` Simon Jeons [this message]
2013-01-09 8:23 ` Fengguang Wu
2013-01-09 8:26 ` Fengguang Wu
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