Commitcf47b8f

chrismason-xx

authored and

Ingo Molnar

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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 forperformance.Signed-off-by: Chris Mason <chris.mason@oracle.com>Signed-off-by: Ingo Molnar <mingo@elte.hu>

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fs/btrfs
- locking.c

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`‎fs/btrfs/locking.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -37,16 +37,6 @@`
`37`	`37`
`38`	`38`	`intbtrfs_tree_lock(structextent_buffer*eb)`
`39`	`39`	`{`
`40`		`-inti;`
`41`		`-`
`42`		`-if (mutex_trylock(&eb->mutex))`
`43`		`-return0;`
`44`		`-for (i=0;i<512;i++) {`
`45`		`-cpu_relax();`
`46`		`-if (mutex_trylock(&eb->mutex))`
`47`		`-return0;`
`48`		`-}`
`49`		`-cpu_relax();`
`50`	`40`	`mutex_lock_nested(&eb->mutex,BTRFS_MAX_LEVEL-btrfs_header_level(eb));`
`51`	`41`	`return0;`
`52`	`42`	`}`

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Commitcf47b8f

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`‎fs/btrfs/locking.c‎`

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