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[PATCH] Kconfig.debug: Set DEBUG_MUTEX to off by default

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DEBUG_MUTEX flag is on by default in current kernel configuration.

During performance testing, we saw mutex debug functions like
mutex_debug_check_no_locks_freed (called by kfree()) is expensive as it
goes through a global list of memory areas with mutex lock and do the
checking.  For benchmarks such as Volanomark and Hackbench, we have seen
more than 40% drop in performance on some platforms.  We suggest to set
DEBUG_MUTEX off by default.  Or at least do that later when we feel that
the mutex changes in the current code have stabilized.

Signed-off-by: Tim Chen <tim.c.chen@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Tim Chen 2006-04-18 22:21:47 -07:00 committed by Linus Torvalds
parent ca99c1da08
commit cca57c5b5a
1 changed files with 1 additions and 1 deletions
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lib/Kconfig.debug
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@ -101,7 +101,7 @@ config DEBUG_PREEMPT
config DEBUG_MUTEXES
bool "Mutex debugging, deadlock detection"
default y
default n
depends on DEBUG_KERNEL
help
This allows mutex semantics violations and mutex related deadlocks