From: Arjan van de Ven <arjan@linux.intel.com>
Date: Sat, 12 Sep 2009 05:52:47 +0000 (+0200)
Subject: perf: Add a timestamp to fork events
X-Git-Tag: MMI-PSA29.97-13-9~26886^2~18
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=393b2ad8c757ba3ccd2a99ca5bbcd6db4d3fa53d;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git

perf: Add a timestamp to fork events

perf timechart needs to know when a process forked, in order to be
able to visualize properly when tasks start.

This patch adds a time field to the event structure, and fills it
in appropriately.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090912130341.51ad2de2@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index c7375f97aa19..bd341007c4fc 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -336,6 +336,7 @@ enum perf_event_type {
 	 *	struct perf_event_header	header;
 	 *	u32				pid, ppid;
 	 *	u32				tid, ptid;
+	 *	u64				time;
 	 * };
 	 */
 	PERF_EVENT_EXIT			= 4,
@@ -356,6 +357,7 @@ enum perf_event_type {
 	 *	struct perf_event_header	header;
 	 *	u32				pid, ppid;
 	 *	u32				tid, ptid;
+	 *	{ u64				time;     } && PERF_SAMPLE_TIME
 	 * };
 	 */
 	PERF_EVENT_FORK			= 7,
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index d013f4e89e9c..d5899b62b276 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -3083,6 +3083,7 @@ struct perf_task_event {
 		u32				ppid;
 		u32				tid;
 		u32				ptid;
+		u64				time;
 	} event;
 };
 
@@ -3090,9 +3091,12 @@ static void perf_counter_task_output(struct perf_counter *counter,
 				     struct perf_task_event *task_event)
 {
 	struct perf_output_handle handle;
-	int size = task_event->event.header.size;
+	int size;
 	struct task_struct *task = task_event->task;
-	int ret = perf_output_begin(&handle, counter, size, 0, 0);
+	int ret;
+
+	size  = task_event->event.header.size;
+	ret = perf_output_begin(&handle, counter, size, 0, 0);
 
 	if (ret)
 		return;
@@ -3103,7 +3107,10 @@ static void perf_counter_task_output(struct perf_counter *counter,
 	task_event->event.tid = perf_counter_tid(counter, task);
 	task_event->event.ptid = perf_counter_tid(counter, current);
 
+	task_event->event.time = perf_clock();
+
 	perf_output_put(&handle, task_event->event);
+
 	perf_output_end(&handle);
 }
 
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 2495529cae7d..28a579f8fa8e 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -39,6 +39,7 @@ struct fork_event {
 	struct perf_event_header header;
 	u32 pid, ppid;
 	u32 tid, ptid;
+	u64 time;
 };
 
 struct lost_event {