perf_counter: Add PERF_SAMPLE_PERIOD
In order to allow easy tracking of the period, also provide means of
adding it to the sample data.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index e75b91a..f839066 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2404,6 +2404,11 @@
cpu_entry.cpu = raw_smp_processor_id();
}
+ if (sample_type & PERF_SAMPLE_PERIOD) {
+ header.type |= PERF_SAMPLE_PERIOD;
+ header.size += sizeof(u64);
+ }
+
if (sample_type & PERF_SAMPLE_GROUP) {
header.type |= PERF_SAMPLE_GROUP;
header.size += sizeof(u64) +
@@ -2445,6 +2450,9 @@
if (sample_type & PERF_SAMPLE_CPU)
perf_output_put(&handle, cpu_entry);
+ if (sample_type & PERF_SAMPLE_PERIOD)
+ perf_output_put(&handle, counter->hw.sample_period);
+
/*
* XXX PERF_SAMPLE_GROUP vs inherited counters seems difficult.
*/
@@ -2835,6 +2843,7 @@
struct {
struct perf_event_header header;
u64 time;
+ u64 id;
u64 period;
} freq_event = {
.header = {
@@ -2843,6 +2852,7 @@
.size = sizeof(freq_event),
},
.time = sched_clock(),
+ .id = counter->id,
.period = period,
};