Module Name: src
Committed By: riastradh
Date: Sat Oct 29 14:00:12 UTC 2022
Modified Files:
src/sys/sys: sdt.h
Log Message:
sys/sdt.h: Predict dtrace probe branches not taken in SDT_PROBE*.
This should help reduce the overhead of KDRACE_HOOKS while you're not
actually tracing anything! Shoulda done this ages ago...
To generate a diff of this commit:
cvs rdiff -u -r1.14 -r1.15 src/sys/sys/sdt.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/sys/sdt.h
diff -u src/sys/sys/sdt.h:1.14 src/sys/sys/sdt.h:1.15
--- src/sys/sys/sdt.h:1.14 Sun Apr 19 03:12:35 2020
+++ src/sys/sys/sdt.h Sat Oct 29 14:00:12 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: sdt.h,v 1.14 2020/04/19 03:12:35 riastradh Exp $ */
+/* $NetBSD: sdt.h,v 1.15 2022/10/29 14:00:12 riastradh Exp $ */
/*-
* Copyright 2006-2008 John Birrell <j...@freebsd.org>
@@ -172,7 +172,7 @@
extern struct sdt_probe sdt_##prov##_##mod##_##func##_##name[1]
#define SDT_PROBE(prov, mod, func, name, arg0, arg1, arg2, arg3, arg4) do { \
- if (sdt_##prov##_##mod##_##func##_##name->id) \
+ if (__predict_false(sdt_##prov##_##mod##_##func##_##name->id)) \
(*sdt_probe_func)(sdt_##prov##_##mod##_##func##_##name->id, \
(uintptr_t) (arg0), (uintptr_t) (arg1), (uintptr_t) (arg2), \
(uintptr_t) (arg3), (uintptr_t) (arg4)); \
@@ -313,7 +313,7 @@
/* XXX: void * function casts */
#define SDT_PROBE6(prov, mod, func, name, arg0, arg1, arg2, arg3, arg4, arg5) \
do { \
- if (sdt_##prov##_##mod##_##func##_##name->id) \
+ if (__predict_false(sdt_##prov##_##mod##_##func##_##name->id)) \
__FPTRCAST(void (*)(uint32_t, uintptr_t, uintptr_t, \
uintptr_t, uintptr_t, uintptr_t, uintptr_t), \
sdt_probe_func)( \
@@ -324,7 +324,7 @@
#define SDT_PROBE7(prov, mod, func, name, arg0, arg1, arg2, arg3, arg4, arg5, \
arg6) \
do { \
- if (sdt_##prov##_##mod##_##func##_##name->id) \
+ if (__predict_false(sdt_##prov##_##mod##_##func##_##name->id)) \
__FPTRCAST(void (*)(uint32_t, uintptr_t, uintptr_t, \
uintptr_t, uintptr_t, uintptr_t, uintptr_t, \
uintptr_t), sdt_probe_func)( \
