perf stat: Introduce read_counters function

Moving read counters logic into single read_counters function, which
will be called for both interval and overall processing legs.

The reason is to split reading and processing (following patches)
counters code, so we could read counters from other sources (like
perf.data) and process them in the same way as 'perf stat' command does.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1435310967-14570-15-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 3e385f9f12ee8706f5051e05e430ad8f324f2d52..158859e622d374812c88b820363e7a60c2c9a147 100644 (file)
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -323,27 +323,35 @@ static int read_counter(struct perf_evsel *counter)
        return 0;
 }
 
-static void print_interval(void)
+static void read_counters(bool close)
 {
-       static int num_print_interval;
        struct perf_evsel *counter;
        struct perf_stat *ps;
-       struct timespec ts, rs;
-       char prefix[64];
 
-       if (aggr_mode == AGGR_GLOBAL) {
-               evlist__for_each(evsel_list, counter) {
-                       ps = counter->priv;
-                       memset(ps->res_stats, 0, sizeof(ps->res_stats));
+       evlist__for_each(evsel_list, counter) {
+               ps = counter->priv;
+               memset(ps->res_stats, 0, sizeof(ps->res_stats));
+
+               if (aggr_mode == AGGR_GLOBAL)
                        read_counter_aggr(counter);
-               }
-       } else  {
-               evlist__for_each(evsel_list, counter) {
-                       ps = counter->priv;
-                       memset(ps->res_stats, 0, sizeof(ps->res_stats));
+               else
                        read_counter(counter);
+
+               if (close) {
+                       perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
+                                            thread_map__nr(evsel_list->threads));
                }
        }
+}
+
+static void print_interval(void)
+{
+       static int num_print_interval;
+       struct perf_evsel *counter;
+       struct timespec ts, rs;
+       char prefix[64];
+
+       read_counters(false);
 
        clock_gettime(CLOCK_MONOTONIC, &ts);
        diff_timespec(&rs, &ts, &ref_time);
@@ -525,18 +533,7 @@ static int __run_perf_stat(int argc, const char **argv)
 
        update_stats(&walltime_nsecs_stats, t1 - t0);
 
-       if (aggr_mode == AGGR_GLOBAL) {
-               evlist__for_each(evsel_list, counter) {
-                       read_counter_aggr(counter);
-                       perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
-                                            thread_map__nr(evsel_list->threads));
-               }
-       } else {
-               evlist__for_each(evsel_list, counter) {
-                       read_counter(counter);
-                       perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter), 1);
-               }
-       }
+       read_counters(true);
 
        return WEXITSTATUS(status);
 }