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From: Ben Myers <bpm@sgi.com>
To: Jason Rosenberg <jbr@squareup.com>
Cc: stan@hardwarefreak.com, xfs@oss.sgi.com
Subject: Re: understanding speculative preallocation
Date: Fri, 26 Jul 2013 15:50:18 -0500	[thread overview]
Message-ID: <20130726205018.GM3111@sgi.com> (raw)
In-Reply-To: <CAA+BczQGYoJVL0twvz2GRhH30teFPSJOsKWtofbXBrom4_Q6hg@mail.gmail.com>

Hi Jason,

On Fri, Jul 26, 2013 at 04:38:21PM -0400, Jason Rosenberg wrote:
> Thanks for the info (most of it was, in fact, news to me).  I'm an
> application developer trying to debug a disk space problem, that's all.  So
> far, I've tracked it down to being an XFS issue.

The speculative block reservations have been an issue for awhile.  You are not
the first person to take issue with it.

> Regardless, is there a version history for XFS vis-a-via mainline Linux?

You can find a full version history for XFS back to 2.6.12 or so here:
http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/xfs.git;a=summary

If you're interested in going older than that look here:
http://oss.sgi.com/cgi-bin/gitweb.cgi?p=archive/xfs-import.git;a=summary

The function you'll most likely want to track is xfs_iomap_write_delay, which
calls xfs_iomap_eof_want_preallocate, both of which are in fs/xfs/xfs_iomap.c.

Recently Brian Foster added a scanner to remove the speculative block
reservations on a timer which may give you some relief.  See
xfs_queue_eofblocks in fs/xfs/xfs_icache.c

Regards,
	Ben

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  reply	other threads:[~2013-07-26 20:50 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-26  7:23 understanding speculative preallocation jbr
2013-07-26 11:50 ` Dave Chinner
2013-07-26 17:40   ` Jason Rosenberg
2013-07-26 19:27     ` Stan Hoeppner
2013-07-26 19:43       ` A short digression on FOSS (Re: understanding speculative preallocation) Jay Ashworth
2013-07-27  3:52         ` Stan Hoeppner
2013-07-27 21:00           ` Jay Ashworth
2013-07-28  1:38             ` aurfalien
2013-07-28  1:50               ` Jay Ashworth
2013-07-28  2:08                 ` aurfalien
2013-07-28  2:21                   ` Jay Ashworth
2013-07-28  5:09                     ` Purpose of the XFS list -- was: " Stan Hoeppner
2013-07-28 15:45                       ` Jay Ashworth
2013-08-14 17:01                         ` Emmanuel Florac
2013-07-28  7:18                     ` Stefan Ring
2013-07-28 15:48                       ` Jay Ashworth
2013-07-29  0:02                       ` Dave Chinner
2013-07-29  0:06                         ` Jay Ashworth
2013-07-29  2:41                           ` Dave Chinner
2013-07-29  3:12                             ` Eric Sandeen
2013-07-29  4:11                               ` Stan Hoeppner
2013-07-29 14:33                                 ` Jay Ashworth
2013-07-29 15:25                                   ` Dave Howorth
2013-07-29  3:38                             ` Keith Keller
2013-07-29  4:32                               ` Eric Sandeen
2013-07-29  4:57                                 ` Keith Keller
2013-07-29 13:38                                   ` Eric Sandeen
2013-07-29 18:15                                     ` Keith Keller
2013-07-29 14:24                             ` Jay Ashworth
2013-07-29 14:36                               ` Jay Ashworth
2013-07-29 14:57                               ` Eric Sandeen
2013-07-29 15:30                                 ` Jay Ashworth
2013-07-29 17:05                                   ` Eric Sandeen
2013-07-29  0:00                     ` Dave Chinner
2013-07-28  5:15             ` Michael L. Semon
2013-07-26 20:38       ` understanding speculative preallocation Jason Rosenberg
2013-07-26 20:50         ` Ben Myers [this message]
2013-07-26 21:04           ` Jason Rosenberg
2013-07-26 21:11             ` Jason Rosenberg
2013-07-26 21:42               ` Ben Myers
2013-07-27  1:30               ` Dave Chinner
2013-07-28  2:19                 ` Jason Rosenberg
2013-07-29  0:04                   ` Dave Chinner
2013-07-26 21:45         ` Eric Sandeen
2013-07-27  4:26       ` Keith Keller
2013-07-27  1:26     ` Dave Chinner
  -- strict thread matches above, loose matches on Subject: below --
2013-07-26  7:35 jbr

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