]> git.baikalelectronics.ru Git - kernel.git/commit
Btrfs: don't take the chunk_mutex/dev_list mutex in statfs V2
authorJosef Bacik <jbacik@fb.com>
Mon, 3 Nov 2014 13:56:50 +0000 (08:56 -0500)
committerChris Mason <clm@fb.com>
Fri, 21 Nov 2014 01:20:05 +0000 (17:20 -0800)
commit1d51f4c0d0c0f1928bcb81e84e08e109ad2d7bf6
treeff2ddc1af7bc7e6f4949ca70519cccf7964c9ae8
parentcaf5570effb3bad55fc95ade4dd584905f099396
Btrfs: don't take the chunk_mutex/dev_list mutex in statfs V2

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>
fs/btrfs/super.c