From: Stephane Chazelas <stephane_chazelas@yahoo.fr>
To: Tomasz Chmielewski <mangoo@wpkg.org>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: curious writes on mounted, not used btrfs filesystem
Date: Sun, 22 May 2011 19:26:12 +0100 [thread overview]
Message-ID: <20110522182612.GB22491@yahoo.fr> (raw)
In-Reply-To: <4DD8DCE5.6070703@wpkg.org>
2011-05-22 11:52:37 +0200, Tomasz Chmielewski:
[...]
> Can you try running these commands yourself:
>
> iostat -k 1 </your/btrfs/device>
>
>
> And in a second terminal:
>
> while true; do sync ; done
>
>
> To see if your btrfs makes writes on sync each time?
[...]
Yes it does. And I see:
<7>[38554.244219] sync(3354): dirtied inode 1 (?) on dm-11
<7>[38554.244740] btrfs-submit-0(29134): WRITE block 301128 on dm-11 (56 sectors)
<7>[38554.244774] btrfs-submit-0(29134): WRITE block 741832 on dm-11 (56 sectors)
<7>[38554.249963] sync(3354): WRITE block 128 on dm-11 (8 sectors)
<7>[38554.250010] sync(3354): WRITE block 131072 on dm-11 (8 sectors)
<7>[38567.312908] sync(3356): dirtied inode 1 (?) on dm-11
<7>[38567.313330] btrfs-submit-0(29134): WRITE block 301256 on dm-11 (24 sectors)
<7>[38567.313350] btrfs-submit-0(29134): WRITE block 741960 on dm-11 (24 sectors)
<7>[38567.313358] btrfs-submit-0(29134): WRITE block 301288 on dm-11 (24 sectors)
<7>[38567.313366] btrfs-submit-0(29134): WRITE block 741992 on dm-11 (24 sectors)
<7>[38567.313393] btrfs-submit-0(29134): WRITE block 301312 on dm-11 (8 sectors)
<7>[38567.313403] btrfs-submit-0(29134): WRITE block 742016 on dm-11 (8 sectors)
<7>[38567.325194] sync(3356): WRITE block 128 on dm-11 (8 sectors)
<7>[38567.325244] sync(3356): WRITE block 131072 on dm-11 (8 sectors)
<7>[38570.374449] sync(3358): dirtied inode 1 (?) on dm-11
<7>[38570.374976] btrfs-submit-0(29134): WRITE block 301128 on dm-11 (56 sectors)
<7>[38570.375011] btrfs-submit-0(29134): WRITE block 741832 on dm-11 (56 sectors)
<7>[38570.379221] sync(3358): WRITE block 128 on dm-11 (8 sectors)
<7>[38570.379272] sync(3358): WRITE block 131072 on dm-11 (8 sectors)
<7>[38572.170816] sync(3359): dirtied inode 1 (?) on dm-11
<7>[38572.171289] btrfs-submit-0(29134): WRITE block 301256 on dm-11 (24 sectors)
<7>[38572.171300] btrfs-submit-0(29134): WRITE block 741960 on dm-11 (24 sectors)
<7>[38572.171304] btrfs-submit-0(29134): WRITE block 301288 on dm-11 (24 sectors)
<7>[38572.171308] btrfs-submit-0(29134): WRITE block 741992 on dm-11 (24 sectors)
<7>[38572.171320] btrfs-submit-0(29134): WRITE block 301312 on dm-11 (8 sectors)
<7>[38572.171325] btrfs-submit-0(29134): WRITE block 742016 on dm-11 (8 sectors)
<7>[38572.180338] sync(3359): WRITE block 128 on dm-11 (8 sectors)
<7>[38572.180386] sync(3359): WRITE block 131072 on dm-11 (8 sectors)
<7>[38574.186559] sync(3360): dirtied inode 1 (?) on dm-11
<7>[38574.187090] btrfs-submit-0(29134): WRITE block 301128 on dm-11 (56 sectors)
<7>[38574.187125] btrfs-submit-0(29134): WRITE block 741832 on dm-11 (56 sectors)
<7>[38574.191602] sync(3360): WRITE block 128 on dm-11 (8 sectors)
<7>[38574.191654] sync(3360): WRITE block 131072 on dm-11 (8 sectors)
<7>[38576.370003] sync(3361): dirtied inode 1 (?) on dm-11
<7>[38576.370452] btrfs-submit-0(29134): WRITE block 301256 on dm-11 (24 sectors)
<7>[38576.370470] btrfs-submit-0(29134): WRITE block 741960 on dm-11 (24 sectors)
<7>[38576.370478] btrfs-submit-0(29134): WRITE block 301288 on dm-11 (24 sectors)
<7>[38576.370485] btrfs-submit-0(29134): WRITE block 741992 on dm-11 (24 sectors)
<7>[38576.370513] btrfs-submit-0(29134): WRITE block 301312 on dm-11 (8 sectors)
<7>[38576.370523] btrfs-submit-0(29134): WRITE block 742016 on dm-11 (8 sectors)
<7>[38576.379718] sync(3361): WRITE block 128 on dm-11 (8 sectors)
<7>[38576.379766] sync(3361): WRITE block 131072 on dm-11 (8 sectors)
Every other sync the same.
--
Stephane
next prev parent reply other threads:[~2011-05-22 18:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-21 12:58 curious writes on mounted, not used btrfs filesystem Tomasz Chmielewski
2011-05-22 9:34 ` Stephane Chazelas
2011-05-22 9:52 ` Tomasz Chmielewski
2011-05-22 18:26 ` Stephane Chazelas [this message]
2011-05-22 15:21 ` Swâmi Petaramesh
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110522182612.GB22491@yahoo.fr \
--to=stephane_chazelas@yahoo.fr \
--cc=linux-btrfs@vger.kernel.org \
--cc=mangoo@wpkg.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).