Commit cf47b8f3 authored Jan 14, 2009 by Chris Mason Committed by Ingo Molnar Jan 15, 2009

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



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>

parent ac6e60ee

fs/btrfs/locking.c

+0 −10

Original line number	Diff line number	Diff line
		@@ -37,16 +37,6 @@

		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));
		return 0;
		}