[PATCH 05/19] perf sched: Remove sched_process_fork tracepoint

David Ahern
2013-08-08T02:55:34Z

The PERF_RECORD_FORK event is already collected as part of the use of
cmd_record and those events are analyzed as part of the libperf machinery.
Using the fork tracepoint as well just duplicates the event load.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
---
tools/perf/builtin-sched.c | 60 +++++++++++++++++++++++---------------------
1 file changed, 31 insertions(+), 29 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 42f4587..f809cc7 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -109,8 +109,9 @@ struct trace_sched_handler {
int (*wakeup_event)(struct perf_sched *sched, struct perf_evsel *evsel,
struct perf_sample *sample, struct machine *machine);

- int (*fork_event)(struct perf_sched *sched, struct perf_evsel *evsel,
- struct perf_sample *sample);
+ /* PERF_RECORD_FORK event, not sched_process_fork tracepoint */
+ int (*fork_event)(struct perf_sched *sched, union perf_event *event,
+ struct machine *machine);

int (*migrate_task_event)(struct perf_sched *sched,
struct perf_evsel *evsel,
@@ -717,22 +718,29 @@ static int replay_switch_event(struct perf_sched *sched,
return 0;
}

-static int replay_fork_event(struct perf_sched *sched, struct perf_evsel *evsel,
- struct perf_sample *sample)
+static int replay_fork_event(struct perf_sched *sched,
+ union perf_event *event,
+ struct machine *machine)
{
- const char *parent_comm = perf_evsel__strval(evsel, sample, "parent_comm"),
- *child_comm = perf_evsel__strval(evsel, sample, "child_comm");
- const u32 parent_pid = perf_evsel__intval(evsel, sample, "parent_pid"),
- child_pid = perf_evsel__intval(evsel, sample, "child_pid");
+ struct thread *child, *parent;
+
+ child = machine__findnew_thread(machine, event->fork.tid);
+ parent = machine__findnew_thread(machine, event->fork.ptid);
+
+ if (child == NULL || parent == NULL) {
+ pr_debug("thread does not exist on fork event: child %p, parent %p\n",
+ child, parent);
+ return 0;
+ }

if (verbose) {
- printf("sched_fork event %p\n", evsel);
- printf("... parent: %s/%d\n", parent_comm, parent_pid);
- printf("... child: %s/%d\n", child_comm, child_pid);
+ printf("fork event\n");
+ printf("... parent: %s/%d\n", parent->comm, parent->tid);
+ printf("... child: %s/%d\n", child->comm, child->tid);
}

- register_pid(sched, parent_pid, parent_comm);
- register_pid(sched, child_pid, child_comm);
+ register_pid(sched, parent->tid, parent->comm);
+ register_pid(sched, child->tid, child->comm);
return 0;
}

@@ -824,14 +832,6 @@ static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
return 0;
}

-static int latency_fork_event(struct perf_sched *sched __maybe_unused,
- struct perf_evsel *evsel __maybe_unused,
- struct perf_sample *sample __maybe_unused)
-{
- /* should insert the newcomer */
- return 0;
-}
-
static char sched_out_state(u64 prev_state)
{
const char *str = TASK_STATE_TO_CHAR_STR;
@@ -1379,15 +1379,19 @@ static int process_sched_runtime_event(struct perf_tool *tool,
return 0;
}

-static int process_sched_fork_event(struct perf_tool *tool,
- struct perf_evsel *evsel,
- struct perf_sample *sample,
- struct machine *machine __maybe_unused)
+static int perf_sched__process_fork_event(struct perf_tool *tool,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);

+ /* run the fork event through the perf machineruy */
+ perf_event__process_fork(tool, event, sample, machine);
+
+ /* and then run additional processing needed for this command */
if (sched->tp_handler->fork_event)
- return sched->tp_handler->fork_event(sched, evsel, sample);
+ return sched->tp_handler->fork_event(sched, event, machine);

return 0;
}
@@ -1437,7 +1441,6 @@ static int perf_sched__read_events(struct perf_sched *sched,
{ "sched:sched_stat_runtime", process_sched_runtime_event, },
{ "sched:sched_wakeup", process_sched_wakeup_event, },
{ "sched:sched_wakeup_new", process_sched_wakeup_event, },
- { "sched:sched_process_fork", process_sched_fork_event, },
{ "sched:sched_migrate_task", process_sched_migrate_task_event, },
};
struct perf_session *session;
@@ -1652,7 +1655,7 @@ static struct perf_sched sched = {
.sample = perf_sched__process_tracepoint_sample,
.comm = perf_event__process_comm,
.lost = perf_event__process_lost,
- .fork = perf_event__process_fork,
+ .fork = perf_sched__process_fork_event,
.ordered_samples = true,
},
.cmp_pid = LIST_HEAD_INIT(sched.cmp_pid),
@@ -1714,7 +1717,6 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
.wakeup_event = latency_wakeup_event,
.switch_event = latency_switch_event,
.runtime_event = latency_runtime_event,
- .fork_event = latency_fork_event,
.migrate_task_event = latency_migrate_task_event,
};
struct trace_sched_handler map_ops = {
--
1.7.10.1