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Btrfs: stop spinning on mutex_trylock and let the adaptive code spin for us

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Mutexes now spin internally and the btrfs spin is no longer required for
performance.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Chris Mason
2009-01-14 13:40:46 -05:00
committed by Ingo Molnar
parent ac6e60ee40
commit cf47b8f3d9
1 changed files with 0 additions and 10 deletions
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10
fs/btrfs/locking.c
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@@ -37,16 +37,6 @@
int btrfs_tree_lock(struct extent_buffer *eb) int btrfs_tree_lock(struct extent_buffer *eb)
{ {
int i;
if (mutex_trylock(&eb->mutex))
return 0;
for (i = 0; i < 512; i++) {
cpu_relax();
if (mutex_trylock(&eb->mutex))
return 0;
}
cpu_relax();
mutex_lock_nested(&eb->mutex, BTRFS_MAX_LEVEL - btrfs_header_level(eb)); mutex_lock_nested(&eb->mutex, BTRFS_MAX_LEVEL - btrfs_header_level(eb));
return 0; return 0;
} }