[PATCH v2 09/10] perf stat: Remove --per-thread pid/tid limitation

Jin Yao
2017-11-27T06:12:36Z

Currently, if we execute 'perf stat --per-thread' without specifying
pid/tid, perf will return error.

root@skl:/tmp# perf stat --per-thread
The --per-thread option is only available when monitoring via -p -t options.
-p, --pid <pid> stat events on existing process id
-t, --tid <tid> stat events on existing thread id

This patch removes this limitation. If no pid/tid specified, it returns
all threads (get threads from /proc).

Note that it doesn't support cpu_list yet so if it's a cpu_list case,
then skip.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/builtin-stat.c | 23 +++++++++++++++--------
tools/perf/util/target.h | 7 +++++++
2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 505bb89..d93c8da 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -277,7 +277,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel)
attr->enable_on_exec = 1;
}

- if (target__has_cpu(&target))
+ if (target__has_cpu(&target) && !target__has_per_thread(&target))
return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));

return perf_evsel__open_per_thread(evsel, evsel_list->threads);
@@ -340,7 +340,7 @@ static int read_counter(struct perf_evsel *counter)
int nthreads = thread_map__nr(evsel_list->threads);
int ncpus, cpu, thread;

- if (target__has_cpu(&target))
+ if (target__has_cpu(&target) && !target__has_per_thread(&target))
ncpus = perf_evsel__nr_cpus(counter);
else
ncpus = 1;
@@ -2746,12 +2746,16 @@ int cmd_stat(int argc, const char **argv)
run_count = 1;
}

- if ((stat_config.aggr_mode == AGGR_THREAD) && !target__has_task(&target)) {
- fprintf(stderr, "The --per-thread option is only available "
- "when monitoring via -p -t options.\n");
- parse_options_usage(NULL, stat_options, "p", 1);
- parse_options_usage(NULL, stat_options, "t", 1);
- goto out;
+ if ((stat_config.aggr_mode == AGGR_THREAD) &&
+ !target__has_task(&target)) {
+ if (!target.system_wide || target.cpu_list) {
+ fprintf(stderr, "The --per-thread option is only "
+ "available when monitoring via -p -t -a "
+ "options or only --per-thread.\n");
+ parse_options_usage(NULL, stat_options, "p", 1);
+ parse_options_usage(NULL, stat_options, "t", 1);
+ goto out;
+ }
}

/*
@@ -2775,6 +2779,9 @@ int cmd_stat(int argc, const char **argv)

target__validate(&target);

+ if ((stat_config.aggr_mode == AGGR_THREAD) && (target.system_wide))
+ target.per_thread = true;
+
if (perf_evlist__create_maps(evsel_list, &target) < 0) {
if (target__has_task(&target)) {
pr_err("Problems finding threads of monitor\n");
diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h
index 446aa7a..6ef01a8 100644
--- a/tools/perf/util/target.h
+++ b/tools/perf/util/target.h
@@ -64,6 +64,11 @@ static inline bool target__none(struct target *target)
return !target__has_task(target) && !target__has_cpu(target);
}

+static inline bool target__has_per_thread(struct target *target)
+{
+ return target->system_wide && target->per_thread;
+}
+
static inline bool target__uses_dummy_map(struct target *target)
{
bool use_dummy = false;
@@ -73,6 +78,8 @@ static inline bool target__uses_dummy_map(struct target *target)
else if (target__has_task(target) ||
(!target__has_cpu(target) && !target->uses_mmap))
use_dummy = true;
+ else if (target__has_per_thread(target))
+ use_dummy = true;

return use_dummy;
}
--
2.7.4