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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-05-12 21:21:10 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-05-23 22:26:03 +0200
commit0aa977f592f17004f9d1d545f2e1bb9ea71896c3 (patch)
tree3568f8f505ca613c64e7e5c863a829429c728ee1 /include/linux/marker.h
parentdc102a8fae2d0d6bf5223fc549247f2e23959ae6 (diff)
downloadop-kernel-dev-0aa977f592f17004f9d1d545f2e1bb9ea71896c3.zip
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Markers - define non optimized marker
To support the forthcoming "immediate values" marker optimization, we must have a way to declare markers in few code paths that does not use instruction modification based enable. This will be the case of printk(), some traps and eventually lockdep instrumentation. Changelog : - Fix reversed boolean logic of "generic". Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/marker.h')
-rw-r--r--include/linux/marker.h29
1 files changed, 24 insertions, 5 deletions
diff --git a/include/linux/marker.h b/include/linux/marker.h
index 338533a..1290653 100644
--- a/include/linux/marker.h
+++ b/include/linux/marker.h
@@ -58,8 +58,12 @@ struct marker {
* Make sure the alignment of the structure in the __markers section will
* not add unwanted padding between the beginning of the section and the
* structure. Force alignment to the same alignment as the section start.
+ *
+ * The "generic" argument controls which marker enabling mechanism must be used.
+ * If generic is true, a variable read is used.
+ * If generic is false, immediate values are used.
*/
-#define __trace_mark(name, call_private, format, args...) \
+#define __trace_mark(generic, name, call_private, format, args...) \
do { \
static const char __mstrtab_##name[] \
__attribute__((section("__markers_strings"))) \
@@ -79,7 +83,7 @@ struct marker {
extern void marker_update_probe_range(struct marker *begin,
struct marker *end);
#else /* !CONFIG_MARKERS */
-#define __trace_mark(name, call_private, format, args...) \
+#define __trace_mark(generic, name, call_private, format, args...) \
__mark_check_format(format, ## args)
static inline void marker_update_probe_range(struct marker *begin,
struct marker *end)
@@ -87,15 +91,30 @@ static inline void marker_update_probe_range(struct marker *begin,
#endif /* CONFIG_MARKERS */
/**
- * trace_mark - Marker
+ * trace_mark - Marker using code patching
* @name: marker name, not quoted.
* @format: format string
* @args...: variable argument list
*
- * Places a marker.
+ * Places a marker using optimized code patching technique (imv_read())
+ * to be enabled when immediate values are present.
*/
#define trace_mark(name, format, args...) \
- __trace_mark(name, NULL, format, ## args)
+ __trace_mark(0, name, NULL, format, ## args)
+
+/**
+ * _trace_mark - Marker using variable read
+ * @name: marker name, not quoted.
+ * @format: format string
+ * @args...: variable argument list
+ *
+ * Places a marker using a standard memory read (_imv_read()) to be
+ * enabled. Should be used for markers in code paths where instruction
+ * modification based enabling is not welcome. (__init and __exit functions,
+ * lockdep, some traps, printk).
+ */
+#define _trace_mark(name, format, args...) \
+ __trace_mark(1, name, NULL, format, ## args)
/**
* MARK_NOARGS - Format string for a marker with no argument.
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