Author: markj
Date: Mon Jul 31 00:59:28 2017
New Revision: 321744
URL: https://svnweb.freebsd.org/changeset/base/321744
Log:
Correct the predicates on which lockstat:::{thread,spin}-spin fire.
In particular, they should fire only if the lock was owned by another
thread when we first attempted to acquire that lock.
MFC after: 1 week
Modified:
head/sys/kern/kern_mutex.c
Modified: head/sys/kern/kern_mutex.c
==============================================================================
--- head/sys/kern/kern_mutex.c Mon Jul 31 00:54:50 2017 (r321743)
+++ head/sys/kern/kern_mutex.c Mon Jul 31 00:59:28 2017 (r321744)
@@ -766,7 +766,7 @@ _mtx_lock_spin_cookie(volatile uintptr_t *c, uintptr_t
LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, m,
contested, waittime, file, line);
#ifdef KDTRACE_HOOKS
- if (spin_time != 0)
+ if (lda.spin_cnt != 0)
LOCKSTAT_RECORD1(spin__spin, m, spin_time);
#endif
}
@@ -879,7 +879,7 @@ retry:
LOCKSTAT_PROFILE_OBTAIN_LOCK_SUCCESS(spin__acquire, m,
contested, waittime, file, line);
#ifdef KDTRACE_HOOKS
- if (spin_time != 0)
+ if (lda.spin_cnt != 0)
LOCKSTAT_RECORD1(thread__spin, m, spin_time);
#endif
}
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