Author: markj
Date: Wed May 18 03:21:21 2016
New Revision: 300103
URL: https://svnweb.freebsd.org/changeset/base/300103
Log:
lockstat:::thread-spin should only fire after spinning for the 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 Wed May 18 03:19:53 2016 (r300102)
+++ head/sys/kern/kern_mutex.c Wed May 18 03:21:21 2016 (r300103)
@@ -714,7 +714,8 @@ retry:
LOCK_LOG_LOCK("LOCK", &m->lock_object, opts, m->mtx_recurse, file,
line);
WITNESS_LOCK(&m->lock_object, opts | LOP_EXCLUSIVE, file, line);
- LOCKSTAT_RECORD1(thread__spin, m, spin_time);
+ if (spin_time != 0)
+ LOCKSTAT_RECORD1(thread__spin, m, spin_time);
}
struct mtx *
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