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Btrfs: optimize leaf_space_used
authorJosef Bacik <jbacik@fusionio.com>
Mon, 15 Oct 2012 17:43:18 +0000 (13:43 -0400)
committerChris Mason <chris.mason@fusionio.com>
Mon, 17 Dec 2012 01:46:26 +0000 (20:46 -0500)
commit41be1f3b40b87de33cd2e7463dce88596dbdccc4
tree6b2bd0ec252c70df303ec89b65fce172a9b5e921tree | snapshot
parentad9145596986b672d8c8235c92ed5307f82d045dcommit | diff
Btrfs: optimize leaf_space_used

This gets called at least 4 times for every level while adding an object,
and it involves 3 kmapping calls, which on my box take about 5us a piece.
So instead use a token, which brings us down to 1 kmap call and makes this
function take 1/3 of the time per call.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
fs/btrfs/ctree.c diff | blob | history
Domain: System / Uncategorized;