Re: [GIT PULL] Btrfs changes for 2.6.30-rc

[Chris Mason <chris.mason@oracle.com>]

On Tue, 2009-04-21 at 09:29 -0400, Chris Mason wrote:
> Hello everyone,
> 
> The master branch of:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
> 
> Has some fixes for oopsen and a cluster of bugs inside of one of the
> btree readahead functions.
> 
> I also jumped on the fsync latency train for btrfs and switched over to
> WRITE_SYNC for the writes I was going to wait on.
> 
> This is a bigger change in btrfs because I had to add a high priority
> list to the async helper threads, but it had a big impact on performance
> overall.  Before, the writes we were waiting on would get stuck behind
> the less critical writes in the async helper threads, and now they pop
> out much faster.
> 
> Average fsync latencies concurrent with a streaming writer went down
> from ~5 seconds (with longer peaks) to < 1 second.
> 

Jens Axboe hit a bug in fallocate, I've pushed that fix out today as
well.  Updated shortlog/diffstat:


Chris Mason (5):
      Btrfs: use WRITE_SYNC for synchronous writes
      Btrfs: add a priority queue to the async thread helpers
      Btrfs: fix oops on page->mapping->host during writepage
      Btrfs: use the right node in reada_for_balance
      Btrfs: fix btrfs fallocate oops and deadlock

 fs/btrfs/async-thread.c |   60 ++++++++++++++++++-----
 fs/btrfs/async-thread.h |    2
 fs/btrfs/ctree.c        |   17 ++++--
 fs/btrfs/disk-io.c      |    9 ++-
 fs/btrfs/extent_io.c    |   86 ++++++++++++++++++++++++---------
 fs/btrfs/file.c         |    6 +-
 fs/btrfs/inode.c        |   36 ++++++++++---
 fs/btrfs/ordered-data.c |    2
 fs/btrfs/volumes.c      |  124 +++++++++++++++++++++++++++++++++++++-----------
 fs/btrfs/volumes.h      |   13 ++++-

-chris