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authorTim Chen <tim.c.chen@linux.intel.com>2006-04-18 22:21:47 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-19 09:13:51 -0700
commitcca57c5b5ab164e3c96576fc7739c0a30c2eab72 (patch)
tree24a41ba1348d12f25c9e0da3b9b7cbaf4f1ce891
parentca99c1da080345e227cfb083c330a184d42e27f3 (diff)
[PATCH] Kconfig.debug: Set DEBUG_MUTEX to off by default
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>
-rw-r--r--lib/Kconfig.debug2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d57fd9181b1..6ecc180beb7 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -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