perf stat: Separate counters reading and processing

Separating counters reading and processing so we could use the
processing part in following patches.

Using simple reading via perf_evsel__read function to read counters now,
because part of the processing was in the read_cb callback.

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/1435310967-14570-16-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 39 insertions, 17 deletions

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 158859e622d3..74ac92baa2bd 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -217,8 +217,9 @@ static int check_per_pkg(struct perf_evsel *counter, int cpu, bool *skip)
         return 0;
 }
 
-static int read_cb(struct perf_evsel *evsel, int cpu, int thread,
-                   struct perf_counts_values *count)
+static int
+process_counter_values(struct perf_evsel *evsel, int cpu, int thread,
+                       struct perf_counts_values *count)
 {
         struct perf_counts_values *aggr = &evsel->counts->aggr;
         static struct perf_counts_values zero;
@@ -239,7 +240,6 @@ static int read_cb(struct perf_evsel *evsel, int cpu, int thread,
                 if (!evsel->snapshot)
                         perf_evsel__compute_deltas(evsel, cpu, thread, count);
                 perf_counts_values__scale(count, scale, NULL);
-                *perf_counts(evsel->counts, cpu, thread) = *count;
                 if (aggr_mode == AGGR_NONE)
                         perf_stat__update_shadow_stats(evsel, count->values, cpu);
                 break;
@@ -256,23 +256,41 @@ static int read_cb(struct perf_evsel *evsel, int cpu, int thread,
         return 0;
 }
 
-static int read_counter(struct perf_evsel *counter);
+static int process_counter_maps(struct perf_evsel *counter)
+{
+        int nthreads = thread_map__nr(counter->threads);
+        int ncpus = perf_evsel__nr_cpus(counter);
+        int cpu, thread;
 
-/*
- * Read out the results of a single counter:
- * aggregate counts across CPUs in system-wide mode
- */
-static int read_counter_aggr(struct perf_evsel *counter)
+        if (counter->system_wide)
+                nthreads = 1;
+
+        for (thread = 0; thread < nthreads; thread++) {
+                for (cpu = 0; cpu < ncpus; cpu++) {
+                        if (process_counter_values(counter, cpu, thread,
+                                                   perf_counts(counter->counts, cpu, thread)))
+                                return -1;
+                }
+        }
+
+        return 0;
+}
+
+static int process_counter(struct perf_evsel *counter)
 {
         struct perf_counts_values *aggr = &counter->counts->aggr;
         struct perf_stat *ps = counter->priv;
         u64 *count = counter->counts->aggr.values;
-        int i;
+        int i, ret;
 
         aggr->val = aggr->ena = aggr->run = 0;
 
-        if (read_counter(counter))
-                return -1;
+        ret = process_counter_maps(counter);
+        if (ret)
+                return ret;
+
+        if (aggr_mode != AGGR_GLOBAL)
+                return 0;
 
         if (!counter->snapshot)
                 perf_evsel__compute_deltas(counter, -1, -1, aggr);
@@ -315,7 +333,10 @@ static int read_counter(struct perf_evsel *counter)
 
         for (thread = 0; thread < nthreads; thread++) {
                 for (cpu = 0; cpu < ncpus; cpu++) {
-                        if (perf_evsel__read_cb(counter, cpu, thread, read_cb))
+                        struct perf_counts_values *count;
+
+                        count = perf_counts(counter->counts, cpu, thread);
+                        if (perf_evsel__read(counter, cpu, thread, count))
                                 return -1;
                 }
         }
@@ -332,10 +353,11 @@ static void read_counters(bool close)
                 ps = counter->priv;
                 memset(ps->res_stats, 0, sizeof(ps->res_stats));
 
-                if (aggr_mode == AGGR_GLOBAL)
-                        read_counter_aggr(counter);
-                else
-                        read_counter(counter);
+                if (read_counter(counter))
+                        pr_warning("failed to read counter %s\n", counter->name);
+
+                if (process_counter(counter))
+                        pr_warning("failed to process counter %s\n", counter->name);
 
                 if (close) {
                         perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),