Btrfs: optimize leaf_space_used

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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>

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Josef Bacik 2012-10-15 13:43:18 -04:00 • committed by Chris Mason

parent ad91455969

commit 41be1f3b40

1 changed files with 9 additions and 2 deletions

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fs/btrfs/ctree.c

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