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perf: Add a timestamp to fork events

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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>
This commit is contained in:
Arjan van de Ven 2009-09-12 07:52:47 +02:00 committed by Ingo Molnar
parent 929bf0d015
commit 393b2ad8c7
3 changed files with 12 additions and 2 deletions
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2
include/linux/perf_counter.h
View file

@ -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,

11
kernel/perf_counter.c
View file

@ -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);
}

1
tools/perf/util/event.h
View file

@ -39,6 +39,7 @@ struct fork_event {
struct perf_event_header header;
u32 pid, ppid;
u32 tid, ptid;
u64 time;
};
struct lost_event {