perf/core: Add a callback to perf events
A simple callback in a perf event can be used for multiple purposes.
For example it is useful for triggered based events like hardware
breakpoints that need a callback to dispatch a triggered breakpoint
event.
v2: Simplify a bit the callback attribution as suggested by Paul
Mackerras
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "K.Prasad" <prasad@linux.vnet.ibm.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index fa151d4..8d54e6d 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -544,6 +544,8 @@
void (*func)(struct perf_pending_entry *);
};
+typedef void (*perf_callback_t)(struct perf_event *, void *);
+
/**
* struct perf_event - performance event kernel representation:
*/
@@ -639,6 +641,8 @@
struct event_filter *filter;
#endif
+ perf_callback_t callback;
+
#endif /* CONFIG_PERF_EVENTS */
};
@@ -748,7 +752,8 @@
extern struct perf_event *
perf_event_create_kernel_counter(struct perf_event_attr *attr,
int cpu,
- pid_t pid);
+ pid_t pid,
+ perf_callback_t callback);
extern u64 perf_event_read_value(struct perf_event *event);
struct perf_sample_data {