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Commit 393b2ad8 authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Ingo Molnar
Browse files

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: default avatarArjan van de Ven <arjan@linux.intel.com>
Acked-by: default avatarPeter 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: default avatarIngo Molnar <mingo@elte.hu>
parent 929bf0d0

include/linux/perf_counter.h

+2 −0
Original line number Diff line number Diff line
@@ -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,

kernel/perf_counter.c

+9 −2
Original line number Diff line number Diff line
@@ -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);

}

tools/perf/util/event.h

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct fork_event { 
	struct perf_event_header header;

	u32 pid, ppid;

	u32 tid, ptid;

	u64 time;

};



struct lost_event {