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perf_counter: Add PERF_SAMPLE_PERIOD

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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>
This commit is contained in:
Peter Zijlstra 2009-06-05 15:05:43 +02:00 committed by Ingo Molnar
parent ac4bcf8894
commit 689802b2d0
2 changed files with 12 additions and 0 deletions
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2
include/linux/perf_counter.h
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@ -106,6 +106,7 @@ enum perf_counter_sample_format {
PERF_SAMPLE_CALLCHAIN = 1U << 5,
PERF_SAMPLE_ID = 1U << 6,
PERF_SAMPLE_CPU = 1U << 7,
PERF_SAMPLE_PERIOD = 1U << 8,
};
/*
@ -260,6 +261,7 @@ enum perf_event_type {
* struct {
* struct perf_event_header header;
* u64 time;
* u64 id;
* u64 sample_period;
* };
*/

10
kernel/perf_counter.c
View file

@ -2404,6 +2404,11 @@ static void perf_counter_output(struct perf_counter *counter,
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 @@ static void perf_counter_output(struct perf_counter *counter,
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 @@ static void perf_log_period(struct perf_counter *counter, u64 period)
struct {
struct perf_event_header header;
u64 time;
u64 id;
u64 period;
} freq_event = {
.header = {
@ -2843,6 +2852,7 @@ static void perf_log_period(struct perf_counter *counter, u64 period)
.size = sizeof(freq_event),
},
.time = sched_clock(),
.id = counter->id,
.period = period,
};