- Re-implement lock profiling in such a way that it no longer breaks

   the ABI when enabled.  There is no longer an embedded lock_profile_object
   in each lock.  Instead a list of lock_profile_objects is kept per-thread
   for each lock it may own.  The cnt_hold statistic is now always 0 to
   facilitate this.
 - Support shared locking by tracking individual lock instances and
   statistics in the per-thread per-instance lock_profile_object.
 - Make the lock profiling hash table a per-cpu singly linked list with a
   per-cpu static lock_prof allocator.  This removes the need for an array
   of spinlocks and reduces cache contention between cores.
 - Use a seperate hash for spinlocks and other locks so that only a
   critical_enter() is required and not a spinlock_enter() to modify the
   per-cpu tables.
 - Count time spent spinning in the lock statistics.
 - Remove the LOCK_PROFILE_SHARED option as it is always supported now.
 - Specifically drop and release the scheduler locks in both schedulers
   since we track owners now.

In collaboration with:	Kip Macy
Sponsored by:	Nokia

1 files changed, 0 insertions, 1 deletions

diff --git a/sys/conf/options b/sys/conf/options
index 6a00e35..e76c61e 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -540,7 +540,6 @@ MUTEX_DEBUG		opt_global.h
 MUTEX_NOINLINE		opt_global.h
 LOCK_PROFILING		opt_global.h
 LOCK_PROFILING_FAST	opt_global.h
-LOCK_PROFILING_SHARED	opt_global.h
 MSIZE			opt_global.h
 REGRESSION		opt_global.h
 RESTARTABLE_PANICS	opt_global.h