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| author | kmacy <kmacy@FreeBSD.org> | 2007-02-27 06:42:05 +0000 |
|---|---|---|
| committer | kmacy <kmacy@FreeBSD.org> | 2007-02-27 06:42:05 +0000 |
| commit | b7672bad26dbe5a50937a2e258fe957b1bc19a8d (patch) | |
| tree | c7228dd81a9d5cf5855323c889da39c667a4dd5a /sys/conf/options | |
| parent | 128ac1d5958eb05b5b0c08882c80a3f90ef76d1b (diff) | |
| download | FreeBSD-src-b7672bad26dbe5a50937a2e258fe957b1bc19a8d.zip FreeBSD-src-b7672bad26dbe5a50937a2e258fe957b1bc19a8d.tar.gz | |
Further improvements to LOCK_PROFILING:
- Fix missing initialization in kern_rwlock.c causing bogus times to be collected
- Move updates to the lock hash to after the lock is released for spin mutexes,
sleep mutexes, and sx locks
- Add new kernel build option LOCK_PROFILE_FAST - only update lock profiling
statistics when an acquisition is contended. This reduces the overhead of
LOCK_PROFILING to increasing system time by 20%-25% which on
"make -j8 kernel-toolchain" on a dual woodcrest is unmeasurable in terms
of wall-clock time. Contrast this to enabling lock profiling without
LOCK_PROFILE_FAST and I see a 5x-6x slowdown in wall-clock time.
Diffstat (limited to 'sys/conf/options')
| -rw-r--r-- | sys/conf/options | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/conf/options b/sys/conf/options index 6d5e593..ebed301 100644 --- a/sys/conf/options +++ b/sys/conf/options @@ -548,6 +548,7 @@ MCLSHIFT opt_global.h MUTEX_DEBUG opt_global.h MUTEX_NOINLINE opt_global.h LOCK_PROFILING opt_global.h +LOCK_PROFILING_FAST opt_global.h MSIZE opt_global.h REGRESSION opt_global.h RESTARTABLE_PANICS opt_global.h |
