Btrfs: don't take the chunk_mutex/dev_list mutex in statfs V2

Browse source

Our gluster boxes get several thousand statfs() calls per second, which begins
to suck hardcore with all of the lock contention on the chunk mutex and dev list
mutex.  We don't really need to hold these things, if we have transient
weirdness with statfs() because of the chunk allocator we don't care, so remove
this locking.

We still need the dev_list lock if you mount with -o alloc_start however, which
is a good argument for nuking that thing from orbit, but that's a patch for
another day.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

...

This commit is contained in:

Josef Bacik 2014-11-03 08:56:50 -05:00 • committed by Chris Mason

parent 633c0aad4c

commit 7e33fd993a

1 changed files with 47 additions and 25 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

72

fs/btrfs/super.c

View file