Author: mjg
Date: Sat Jul 30 22:23:31 2016
New Revision: 303563
URL: https://svnweb.freebsd.org/changeset/base/303563
Log:
sx: increment spin_cnt before cpu_spinwait in xlock
The change is a no-op only done for consistency with the rest of the file.
Modified:
head/sys/kern/kern_sx.c
Modified: head/sys/kern/kern_sx.c
==============================================================================
--- head/sys/kern/kern_sx.c Sat Jul 30 22:21:48 2016 (r303562)
+++ head/sys/kern/kern_sx.c Sat Jul 30 22:23:31 2016 (r303563)
@@ -889,10 +889,10 @@ _sx_slock_hard(struct sx *sx, int opts,
GIANT_SAVE();
while (SX_OWNER(sx->sx_lock) == x &&
TD_IS_RUNNING(owner)) {
+ cpu_spinwait();
#ifdef KDTRACE_HOOKS
spin_cnt++;
#endif
- cpu_spinwait();
}
KTR_STATE0(KTR_SCHED, "thread",
sched_tdname(curthread), "running");
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