svn commit: r260393 - head/sys/sys

[Attilio Rao]

Author: attilio
Date: Tue Jan  7 14:03:42 2014
New Revision: 260393
URL: http://svnweb.freebsd.org/changeset/base/260393

Log:
  Use __predict_false() on sensitive lock paths as most of the times,
  when PMC-soft feature is not used the check will be false.
  
  Sponsored by:	EMC / Isilon storage division
  Submitted by:	Anton Rang <anton.rang at isilon.com>

Modified:
  head/sys/sys/pmckern.h

Modified: head/sys/sys/pmckern.h
==============================================================================
--- head/sys/sys/pmckern.h	Tue Jan  7 13:09:35 2014	(r260392)
+++ head/sys/sys/pmckern.h	Tue Jan  7 14:03:42 2014	(r260393)
@@ -110,7 +110,7 @@ struct pmckern_soft {
 #ifdef PMC_FAKE_TRAPFRAME
 #define PMC_SOFT_CALL(pr, mo, fu, na)						\
 do {										\
-	if (pmc_##pr##_##mo##_##fu##_##na.ps_running) {				\
+	if (__predict_false(pmc_##pr##_##mo##_##fu##_##na.ps_running)) {	\
 		struct pmckern_soft ks;						\
 		register_t intr;						\
 		intr = intr_disable();						\
@@ -135,7 +135,7 @@ do {										\
  */
 #define PMC_SOFT_CALL_TF(pr, mo, fu, na, tf)					\
 do {										\
-	if (pmc_##pr##_##mo##_##fu##_##na.ps_running) {				\
+	if (__predict_false(pmc_##pr##_##mo##_##fu##_##na.ps_running)) {	\
 		struct pmckern_soft ks;						\
 		register_t intr;						\
 		intr = intr_disable();						\