diff options
author | Jiri Olsa <jolsa@kernel.org> | 2017-07-26 15:02:05 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-07-26 20:21:59 +0300 |
commit | f7794d525447f1e4e4b2228dd29dba084005e6bf (patch) | |
tree | 30ebccbdc677b6f20c29e94fe169fe6ef72dff4c /tools/perf/util/evsel.c | |
parent | de63403bfd14ae8d613f30c9a0d415581b4cb37e (diff) | |
download | linux-f7794d525447f1e4e4b2228dd29dba084005e6bf.tar.xz |
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>
Diffstat (limited to 'tools/perf/util/evsel.c')
-rw-r--r-- | tools/perf/util/evsel.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 4dd0fcc06db9..89aecf3a35c7 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1302,6 +1302,106 @@ int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread, return 0; } +static int +perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread) +{ + struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread); + + return perf_evsel__read(evsel, cpu, thread, count); +} + +static void +perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread, + u64 val, u64 ena, u64 run) +{ + struct perf_counts_values *count; + + count = perf_counts(counter->counts, cpu, thread); + + count->val = val; + count->ena = ena; + count->run = run; +} + +static int +perf_evsel__process_group_data(struct perf_evsel *leader, + int cpu, int thread, u64 *data) +{ + u64 read_format = leader->attr.read_format; + struct sample_read_value *v; + u64 nr, ena = 0, run = 0, i; + + nr = *data++; + + if (nr != (u64) leader->nr_members) + return -EINVAL; + + if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) + ena = *data++; + + if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) + run = *data++; + + v = (struct sample_read_value *) data; + + perf_evsel__set_count(leader, cpu, thread, + v[0].value, ena, run); + + for (i = 1; i < nr; i++) { + struct perf_evsel *counter; + + counter = perf_evlist__id2evsel(leader->evlist, v[i].id); + if (!counter) + return -EINVAL; + + perf_evsel__set_count(counter, cpu, thread, + v[i].value, ena, run); + } + + return 0; +} + +static int +perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread) +{ + struct perf_stat_evsel *ps = leader->priv; + u64 read_format = leader->attr.read_format; + int size = perf_evsel__read_size(leader); + u64 *data = ps->group_data; + + if (!(read_format & PERF_FORMAT_ID)) + return -EINVAL; + + if (!perf_evsel__is_group_leader(leader)) + return -EINVAL; + + if (!data) { + data = zalloc(size); + if (!data) + return -ENOMEM; + + ps->group_data = data; + } + + if (FD(leader, cpu, thread) < 0) + return -EINVAL; + + if (readn(FD(leader, cpu, thread), data, size) <= 0) + return -errno; + + return perf_evsel__process_group_data(leader, cpu, thread, data); +} + +int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread) +{ + u64 read_format = evsel->attr.read_format; + + if (read_format & PERF_FORMAT_GROUP) + return perf_evsel__read_group(evsel, cpu, thread); + else + return perf_evsel__read_one(evsel, cpu, thread); +} + int __perf_evsel__read_on_cpu(struct perf_evsel *evsel, int cpu, int thread, bool scale) { |