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[PATCH 0/2] xfs log recovery delay instrumentation

To: xfs@xxxxxxxxxxx
Subject: [PATCH 0/2] xfs log recovery delay instrumentation
From: Brian Foster <bfoster@xxxxxxxxxx>
Date: Wed, 20 Aug 2014 12:55:53 -0400
Delivered-to: xfs@xxxxxxxxxxx
Hi all,

Here's a couple patches to add the log recovery delay instrumentation
required for reproducing the log recovery buf race problem uncovered by


It looked easier to dump this tunable in /proc, but it seems like we
want to move away from adding more things there. This series defines a
generic sys/fs/xfs/debug location to serve a similar purpose and exports
the log recovery delay tunable therein.

The original problem is now easily reproduced with a 10s or so log
recovery delay and the xfstests test I posted the other day:


One thing that comes to mind as I write this is whether it might be a
good idea to only export this debug subdirectory for DEBUG enabled
kernels. Thoughts? Any other thoughts, reviews or flames are appreciated
as well.


Brian Foster (2):
  xfs: add debug sysfs attribute set
  xfs: export log_recovery_delay to delay mount time log recovery

 fs/xfs/xfs_globals.c     |  4 +++
 fs/xfs/xfs_log_recover.c | 12 ++++++++
 fs/xfs/xfs_super.c       | 15 ++++++++--
 fs/xfs/xfs_sysctl.h      |  5 ++++
 fs/xfs/xfs_sysfs.c       | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_sysfs.h       |  1 +
 6 files changed, 106 insertions(+), 2 deletions(-)


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