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btrfs: remove unlikely from data-dependent branches and slow paths

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There are the branch hints that obviously depend on the data being
processed, the CPU predictor will do better job according to the actual
load. It also does not make sense to use the hints in slow paths that do
a lot of other operations like locking, waiting or IO.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba
2014-09-30 01:33:33 +02:00
parent 5d99a998f3
commit ee39b432b4
5 changed files with 10 additions and 10 deletions
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4
fs/btrfs/extent-tree.c
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@@ -9694,7 +9694,7 @@ void btrfs_end_nocow_write(struct btrfs_root *root)
int btrfs_start_nocow_write(struct btrfs_root *root)
{
if (unlikely(atomic_read(&root->will_be_snapshoted)))
if (atomic_read(&root->will_be_snapshoted))
return 0;
percpu_counter_inc(&root->subv_writers->counter);
@@ -9702,7 +9702,7 @@ int btrfs_start_nocow_write(struct btrfs_root *root)
* Make sure counter is updated before we check for snapshot creation.
*/
smp_mb();
if (unlikely(atomic_read(&root->will_be_snapshoted))) {
if (atomic_read(&root->will_be_snapshoted)) {
btrfs_end_nocow_write(root);
return 0;
}