From 689802b2d0536e72281dc959ab9cb34fb3c304cf Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 5 Jun 2009 15:05:43 +0200
Subject: [PATCH] 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>
---
 include/linux/perf_counter.h |  2 ++
 kernel/perf_counter.c        | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 9cea32a0655d..6bc250039738 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -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;
 	 * };
 	 */
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index e75b91a76a58..f8390668c391 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -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,
 	};