Add the OpenSolaris dtrace lockstat provider. The lockstat provider

adds probes for mutexes, reader/writer and shared/exclusive locks to
gather contention statistics and other locking information for
dtrace scripts, the lockstat(1M) command and other potential
consumers.

Reviewed by:	attilio jhb jb
Approved by:	gnn (mentor)

1 files changed, 16 insertions, 0 deletions

diff --git a/sys/kern/kern_rmlock.c b/sys/kern/kern_rmlock.c
index 0a33c60..3d0a10d 100644
--- a/sys/kern/kern_rmlock.c
+++ b/sys/kern/kern_rmlock.c
@@ -35,6 +35,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_ddb.h"
+#include "opt_kdtrace.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -71,6 +72,9 @@ static __inline void compiler_memory_barrier(void) {
 
 static void	assert_rm(struct lock_object *lock, int what);
 static void	lock_rm(struct lock_object *lock, int how);
+#ifdef KDTRACE_HOOKS
+static int	owner_rm(struct lock_object *lock, struct thread **owner);
+#endif
 static int	unlock_rm(struct lock_object *lock);
 
 struct lock_class lock_class_rm = {
@@ -84,6 +88,9 @@ struct lock_class lock_class_rm = {
 #endif
 	.lc_lock = lock_rm,
 	.lc_unlock = unlock_rm,
+#ifdef KDTRACE_HOOKS
+	.lc_owner = owner_rm,
+#endif
 };
 
 static void
@@ -107,6 +114,15 @@ unlock_rm(struct lock_object *lock)
 	panic("unlock_rm called");
 }
 
+#ifdef KDTRACE_HOOKS
+static int
+owner_rm(struct lock_object *lock, struct thread **owner)
+{
+
+	panic("owner_rm called");
+}
+#endif
+
 static struct mtx rm_spinlock;
 
 MTX_SYSINIT(rm_spinlock, &rm_spinlock, "rm_spinlock", MTX_SPIN);