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perf stat: Copy counts from prev_raw_counts to evsel->counts 

It would be useful to support the overall statistics for perf-stat
interval mode. For example, report the summary at the end of "perf-stat
-I" output.

But since perf-stat can support many aggregation modes, such as
--per-thread, --per-socket, -M and etc, we need a solution which doesn't
bring much complexity.

The idea is to use 'evsel->prev_raw_counts' which is updated in each
interval and it's saved with the latest counts. Before reporting the
summary, we copy the counts from evsel->prev_raw_counts to
evsel->counts, and next we just follow non-interval processing.

 v5:
 ---
 Don't save the previous aggr value to the member of [cpu0,thread0]
 in perf_counts. Originally that was a trick because the
 perf_stat_process_counter would create aggr values from per cpu
 values. But we don't need to do that all the time. We will
 handle it in next patch.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200520042737.24160-4-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2020-05-20 12:27:35 +08:00 committed by Arnaldo Carvalho de Melo
parent cf4d9bd67c
commit 297767ac0c
2 changed files with 25 additions and 0 deletions
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24
tools/perf/util/stat.c
View File

@ -225,6 +225,30 @@ void perf_evlist__reset_prev_raw_counts(struct evlist *evlist)
evsel__reset_prev_raw_counts(evsel);
}
static void perf_evsel__copy_prev_raw_counts(struct evsel *evsel)
{
int ncpus = evsel__nr_cpus(evsel);
int nthreads = perf_thread_map__nr(evsel->core.threads);
for (int thread = 0; thread < nthreads; thread++) {
for (int cpu = 0; cpu < ncpus; cpu++) {
*perf_counts(evsel->counts, cpu, thread) =
*perf_counts(evsel->prev_raw_counts, cpu,
thread);
}
}
evsel->counts->aggr = evsel->prev_raw_counts->aggr;
}
void perf_evlist__copy_prev_raw_counts(struct evlist *evlist)
{
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel)
perf_evsel__copy_prev_raw_counts(evsel);
}
static void zero_per_pkg(struct evsel *counter)
{
if (counter->per_pkg_mask)

1
tools/perf/util/stat.h
View File

@ -198,6 +198,7 @@ int perf_evlist__alloc_stats(struct evlist *evlist, bool alloc_raw);
void perf_evlist__free_stats(struct evlist *evlist);
void perf_evlist__reset_stats(struct evlist *evlist);
void perf_evlist__reset_prev_raw_counts(struct evlist *evlist);
void perf_evlist__copy_prev_raw_counts(struct evlist *evlist);
int perf_stat_process_counter(struct perf_stat_config *config,
struct evsel *counter);