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perf sched: Do not delete session object prematurely

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The session object is released prematurely when processing events for
latency command. The session's thread objects are used within the
output_lat_thread function.

Runnning following commands:

 # perf sched record
 # perf sched latency

the latter displays incorrect data and might cause access violation.

Cc: Ingo Molnar <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jiri Olsa <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Jiri Olsa 2011-08-08 23:03:34 +02:00 • committed by Arnaldo Carvalho de Melo
commit 4c09bafae3
1 changed files with 15 additions and 7 deletions
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22
tools/perf/builtin-sched.c
View file

@ -1637,23 +1637,29 @@ static struct perf_event_ops event_ops = {
.ordered_samples = true,
};
static int read_events(void)
static void read_events(bool destroy, struct perf_session **psession)
{
int err = -EINVAL;
struct perf_session *session = perf_session__new(input_name, O_RDONLY,
0, false, &event_ops);
if (session == NULL)
return -ENOMEM;
die("No Memory");
if (perf_session__has_traces(session, "record -R")) {
err = perf_session__process_events(session, &event_ops);
if (err)
die("Failed to process events, error %d", err);
nr_events = session->hists.stats.nr_events[0];
nr_lost_events = session->hists.stats.total_lost;
nr_lost_chunks = session->hists.stats.nr_events[PERF_RECORD_LOST];
}
perf_session__delete(session);
return err;
if (destroy)
perf_session__delete(session);
if (psession)
*psession = session;
}
static void print_bad_events(void)
@ -1689,9 +1695,10 @@ static void print_bad_events(void)
static void __cmd_lat(void)
{
struct rb_node *next;
struct perf_session *session;
setup_pager();
read_events();
read_events(false, &session);
sort_lat();
printf("\n ---------------------------------------------------------------------------------------------------------------\n");
@ -1717,6 +1724,7 @@ static void __cmd_lat(void)
print_bad_events();
printf("\n");
perf_session__delete(session);
}
static struct trace_sched_handler map_ops = {
@ -1731,7 +1739,7 @@ static void __cmd_map(void)
max_cpu = sysconf(_SC_NPROCESSORS_CONF);
setup_pager();
read_events();
read_events(true, NULL);
print_bad_events();
}
@ -1744,7 +1752,7 @@ static void __cmd_replay(void)
test_calibrations();
read_events();
read_events(true, NULL);
printf("nr_run_events: %ld\n", nr_run_events);
printf("nr_sleep_events: %ld\n", nr_sleep_events);