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perf evsel: Add read_counter()
Add perf_evsel__read_counter() to read single or group counter. After calling this function the counter's evsel::counts struct is filled with values for the counter and member of its group if there are any. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20170726120206.9099-3-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -1302,6 +1302,106 @@ int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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return 0;
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}
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static int
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perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
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{
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struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
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return perf_evsel__read(evsel, cpu, thread, count);
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}
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static void
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perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
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u64 val, u64 ena, u64 run)
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{
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struct perf_counts_values *count;
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count = perf_counts(counter->counts, cpu, thread);
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count->val = val;
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count->ena = ena;
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count->run = run;
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}
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static int
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perf_evsel__process_group_data(struct perf_evsel *leader,
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int cpu, int thread, u64 *data)
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{
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u64 read_format = leader->attr.read_format;
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struct sample_read_value *v;
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u64 nr, ena = 0, run = 0, i;
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nr = *data++;
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if (nr != (u64) leader->nr_members)
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return -EINVAL;
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if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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ena = *data++;
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if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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run = *data++;
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v = (struct sample_read_value *) data;
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perf_evsel__set_count(leader, cpu, thread,
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v[0].value, ena, run);
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for (i = 1; i < nr; i++) {
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struct perf_evsel *counter;
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counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
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if (!counter)
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return -EINVAL;
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perf_evsel__set_count(counter, cpu, thread,
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v[i].value, ena, run);
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}
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return 0;
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}
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static int
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perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
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{
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struct perf_stat_evsel *ps = leader->priv;
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u64 read_format = leader->attr.read_format;
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int size = perf_evsel__read_size(leader);
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u64 *data = ps->group_data;
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if (!(read_format & PERF_FORMAT_ID))
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return -EINVAL;
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if (!perf_evsel__is_group_leader(leader))
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return -EINVAL;
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if (!data) {
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data = zalloc(size);
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if (!data)
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return -ENOMEM;
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ps->group_data = data;
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}
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if (FD(leader, cpu, thread) < 0)
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return -EINVAL;
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if (readn(FD(leader, cpu, thread), data, size) <= 0)
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return -errno;
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return perf_evsel__process_group_data(leader, cpu, thread, data);
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}
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int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
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{
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u64 read_format = evsel->attr.read_format;
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if (read_format & PERF_FORMAT_GROUP)
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return perf_evsel__read_group(evsel, cpu, thread);
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else
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return perf_evsel__read_one(evsel, cpu, thread);
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}
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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int cpu, int thread, bool scale)
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{
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@ -299,6 +299,8 @@ static inline bool perf_evsel__match2(struct perf_evsel *e1,
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int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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struct perf_counts_values *count);
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int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread);
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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int cpu, int thread, bool scale);
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@ -128,6 +128,10 @@ static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
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static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
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{
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struct perf_stat_evsel *ps = evsel->priv;
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if (ps)
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free(ps->group_data);
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zfree(&evsel->priv);
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}
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@ -28,8 +28,9 @@ enum perf_stat_evsel_id {
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};
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struct perf_stat_evsel {
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struct stats res_stats[3];
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enum perf_stat_evsel_id id;
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struct stats res_stats[3];
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enum perf_stat_evsel_id id;
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u64 *group_data;
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};
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enum aggr_mode {
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