tree b21dad1310e4351854b9e2e24feb86beed20d1f7
parent 97d3ac75e5e0ebf7ca38ae74cebd201c09b97ab2
author Christoph Hellwig <hch@infradead.org> 1303671977 +0000
committer Alex Elder <aelder@sgi.com> 1304014689 -0500

xfs: reduce the number of pagb_lock roundtrips in xfs_alloc_clear_busy

Instead of finding the per-ag and then taking and releasing the pagb_lock
for every single busy extent completed sort the list of busy extents and
only switch betweens AGs where nessecary.  This becomes especially important
with the online discard support which will hit this lock more often.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>