From: Dave Chinner <david@fromorbit.com>
To: Brian Foster <bfoster@redhat.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 04/27] xfs: don't use speculative prealloc for small files
Date: Thu, 13 Jun 2013 10:50:50 +1000 [thread overview]
Message-ID: <20130613005050.GA29338@dastard> (raw)
In-Reply-To: <51B89D58.80108@redhat.com>
On Wed, Jun 12, 2013 at 12:10:00PM -0400, Brian Foster wrote:
> On 06/12/2013 06:22 AM, Dave Chinner wrote:
> > From: Dave Chinner <dchinner@redhat.com>
> >
> ...
> > ---
> > fs/xfs/xfs_iomap.c | 13 +++++++++++++
> > 1 file changed, 13 insertions(+)
> >
> > diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> > index 8f8aaee..14be676 100644
> > --- a/fs/xfs/xfs_iomap.c
> > +++ b/fs/xfs/xfs_iomap.c
> > @@ -284,6 +284,15 @@ xfs_iomap_eof_want_preallocate(
> > return 0;
> >
> > /*
> > + * If the file is smaller than the minimum prealloc and we are using
> > + * dynamic preallocation, don't do any preallocation at all as it is
> > + * likely this is the only write to the file that is going to be done.
> > + */
> > + if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
> > + XFS_ISIZE(ip) < mp->m_writeio_blocks)
> > + return 0;
> > +
>
> I stuck this on a box, got a 64k prealloc on an 8k file and then noticed
> this was comparing inode size against a block count. This should
> probably be:
>
> XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks)
>
> Given that, we avoid preallocs entirely until the file size reaches the
> minimum write size (assuming dynamic prealloc mode).
Doh! Will fix.
Cheers
Dave.
--
Dave Chinner
david@fromorbit.com
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2013-06-13 0:51 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-12 10:22 [PATCH 00/27] xfs: current patch queue for 3.11 Dave Chinner
2013-06-12 10:22 ` [PATCH 01/27] xfs: update mount options documentation Dave Chinner
2013-06-13 13:34 ` Eric Sandeen
2013-06-14 0:40 ` Dave Chinner
2013-06-14 0:53 ` Eric Sandeen
2013-06-12 10:22 ` [PATCH 02/27] xfs: add pluging for bulkstat readahead Dave Chinner
2013-06-12 10:22 ` [PATCH 03/27] xfs: plug directory buffer readahead Dave Chinner
2013-06-12 10:22 ` [PATCH 04/27] xfs: don't use speculative prealloc for small files Dave Chinner
2013-06-12 16:10 ` Brian Foster
2013-06-13 0:50 ` Dave Chinner [this message]
2013-06-12 10:22 ` [PATCH 05/27] xfs: don't do IO when creating an new inode Dave Chinner
2013-06-12 10:22 ` [PATCH 06/27] xfs: xfs_ifree doesn't need to modify the inode buffer Dave Chinner
2013-06-12 10:22 ` [PATCH 07/27] xfs: Introduce ordered log vector support Dave Chinner
2013-06-12 10:22 ` [PATCH 08/27] xfs: Introduce an ordered buffer item Dave Chinner
2013-06-12 10:22 ` [PATCH 09/27] xfs: Inode create log items Dave Chinner
2013-06-12 10:22 ` [PATCH 10/27] xfs: Inode create transaction reservations Dave Chinner
2013-06-12 10:22 ` [PATCH 11/27] xfs: Inode create item recovery Dave Chinner
2013-06-12 10:22 ` [PATCH 12/27] xfs: Use inode create transaction Dave Chinner
2013-06-12 10:22 ` [PATCH 13/27] xfs: remove local fork format handling from xfs_bmapi_write() Dave Chinner
2013-06-12 10:22 ` [PATCH 14/27] xfs: move getdents code into it's own file Dave Chinner
2013-06-12 10:22 ` [PATCH 15/27] xfs: reshuffle dir2 definitions around for userspace Dave Chinner
2013-06-17 16:05 ` Christoph Hellwig
2013-06-18 21:12 ` Dave Chinner
2013-06-18 21:35 ` Dave Chinner
2013-06-12 10:22 ` [PATCH 16/27] xfs: split out attribute listing code into separate file Dave Chinner
2013-06-12 10:22 ` [PATCH 17/27] xfs: split out attribute fork truncation " Dave Chinner
2013-06-12 10:22 ` [PATCH 18/27] xfs: split out xfs inode operations " Dave Chinner
2013-06-12 14:05 ` Christoph Hellwig
2013-06-13 1:14 ` Dave Chinner
2013-06-13 8:00 ` Dave Chinner
2013-06-17 15:56 ` Christoph Hellwig
2013-06-17 18:14 ` Ben Myers
2013-06-18 20:40 ` Dave Chinner
2013-06-18 21:37 ` Ben Myers
2013-06-18 22:02 ` Dave Chinner
2013-06-12 10:22 ` [PATCH 19/27] xfs: consolidate xfs_vnodeops.c into xfs_inode_ops.c Dave Chinner
2013-06-12 13:59 ` Christoph Hellwig
2013-06-13 1:39 ` Dave Chinner
2013-06-17 16:02 ` Christoph Hellwig
2013-06-18 20:55 ` Dave Chinner
2013-06-12 10:22 ` [PATCH 20/27] xfs: move xfs_getbmap to xfs_extent_ops.c Dave Chinner
2013-06-12 10:22 ` [PATCH 21/27] xfs: introduce xfs_sb.c for sharing with libxfs Dave Chinner
2013-06-12 10:22 ` [PATCH 22/27] xfs: move xfs_trans_reservations to xfs_trans.h Dave Chinner
2013-06-12 10:22 ` [PATCH 23/27] xfs: sync minor header differences needed by userspace Dave Chinner
2013-06-12 10:22 ` [PATCH 24/27] xfs: move xfs_bmap_punch_delalloc() to xfs_aops.c Dave Chinner
2013-06-12 14:06 ` Christoph Hellwig
2013-06-13 1:39 ` Dave Chinner
2013-06-12 10:22 ` [PATCH 25/27] xfs: split out transaction reservation code Dave Chinner
2013-06-12 10:22 ` [PATCH 26/27] xfs: minor cleanups Dave Chinner
2013-06-12 10:22 ` [PATCH 27/27] xfs: fix issues that cause userspace warnings Dave Chinner
2013-06-17 19:32 ` Brian Foster
2013-06-18 21:42 ` Dave Chinner
2013-06-12 13:06 ` [PATCH 00/27] xfs: current patch queue for 3.11 Brian Foster
2013-06-13 1:40 ` Dave Chinner
2013-06-12 14:17 ` Ben Myers
2013-06-13 1:58 ` Dave Chinner
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=20130613005050.GA29338@dastard \
--to=david@fromorbit.com \
--cc=bfoster@redhat.com \
--cc=xfs@oss.sgi.com \
/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