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Markers - define non optimized marker

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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>
This commit is contained in:
Mathieu Desnoyers 2008-05-12 21:21:10 +02:00 • committed by Thomas Gleixner
parent dc102a8fae
commit 0aa977f592
1 changed files with 24 additions and 5 deletions
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29
include/linux/marker.h
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@ -58,8 +58,12 @@ struct marker {
* Make sure the alignment of the structure in the __markers section will * Make sure the alignment of the structure in the __markers section will
* not add unwanted padding between the beginning of the section and the * not add unwanted padding between the beginning of the section and the
* structure. Force alignment to the same alignment as the section start. * 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 { \ do { \
static const char __mstrtab_##name[] \ static const char __mstrtab_##name[] \
__attribute__((section("__markers_strings"))) \ __attribute__((section("__markers_strings"))) \
@ -79,7 +83,7 @@ struct marker {
extern void marker_update_probe_range(struct marker *begin, extern void marker_update_probe_range(struct marker *begin,
struct marker *end); struct marker *end);
#else /* !CONFIG_MARKERS */ #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) __mark_check_format(format, ## args)
static inline void marker_update_probe_range(struct marker *begin, static inline void marker_update_probe_range(struct marker *begin,
struct marker *end) struct marker *end)
@ -87,15 +91,30 @@ static inline void marker_update_probe_range(struct marker *begin,
#endif /* CONFIG_MARKERS */ #endif /* CONFIG_MARKERS */
/** /**
* trace_mark - Marker * trace_mark - Marker using code patching
* @name: marker name, not quoted. * @name: marker name, not quoted.
* @format: format string * @format: format string
* @args...: variable argument list * @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...) \ #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. * MARK_NOARGS - Format string for a marker with no argument.