cvs commit: src/sys/conf options src/sys/kern kern_mutex.c kern_rwlock.c kern_sx.c src/sys/sys lock.h lock_profile.h

Kip Macy kmacy at
Tue Feb 27 06:42:05 UTC 2007

kmacy       2007-02-27 06:42:05 UTC

  FreeBSD src repository

  Modified files:
    sys/conf             options 
    sys/kern             kern_mutex.c kern_rwlock.c kern_sx.c 
    sys/sys              lock.h lock_profile.h 
  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.
  Revision  Changes    Path
  1.577     +1 -0      src/sys/conf/options
  1.181     +14 -3     src/sys/kern/kern_mutex.c
  1.15      +2 -2      src/sys/kern/kern_rwlock.c
  1.34      +20 -5     src/sys/kern/kern_sx.c
  1.64      +1 -0      src/sys/sys/lock.h
  1.10      +8 -1      src/sys/sys/lock_profile.h

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