perf annotate: Add symbol__calc_percent function

Add symbol__calc_percent function, that calculates annotation data for
symbol and put the data in the struct annotation_line::samples array.

Committer notes:

Made symbol__calc_percent non static to be used in the next two patches,
which will get some fixups from jolsa, doing it this way to keep this
bisectable.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20171011150158.11895-18-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 61 insertions, 1 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 313fb2e90dba..ff1036096347 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1628,6 +1628,62 @@ out_close_stdout:
         goto out_remove_tmp;
 }
 
+static void calc_percent(struct sym_hist *hist,
+                         struct annotation_data *sample,
+                         s64 offset, s64 end)
+{
+        unsigned int hits = 0;
+        u64 period = 0;
+
+        while (offset < end) {
+                hits   += hist->addr[offset].nr_samples;
+                period += hist->addr[offset].period;
+                ++offset;
+        }
+
+        if (hist->nr_samples) {
+                sample->he.period     = period;
+                sample->he.nr_samples = hits;
+                sample->percent = 100.0 * hits / hist->nr_samples;
+        }
+}
+
+static int annotation__calc_percent(struct annotation *notes,
+                                    struct perf_evsel *evsel, s64 len)
+{
+        struct annotation_line *al, *next;
+
+        list_for_each_entry(al, &notes->src->source, node) {
+                s64 end;
+                int i;
+
+                if (al->offset == -1)
+                        continue;
+
+                next = annotation_line__next(al, &notes->src->source);
+                end  = next ? next->offset : len;
+
+                for (i = 0; i < al->samples_nr; i++) {
+                        struct annotation_data *sample;
+                        struct sym_hist *hist;
+
+                        hist   = annotation__histogram(notes, evsel->idx + i);
+                        sample = &al->samples[i];
+
+                        calc_percent(hist, sample, al->offset, end);
+                }
+        }
+
+        return 0;
+}
+
+int symbol__calc_percent(struct symbol *sym, struct perf_evsel *evsel)
+{
+        struct annotation *notes = symbol__annotation(sym);
+
+        return annotation__calc_percent(notes, evsel, symbol__size(sym));
+}
+
 int symbol__annotate(struct symbol *sym, struct map *map,
                      struct perf_evsel *evsel, size_t privsize,
                      struct arch **parch, char *cpuid)
@@ -1663,7 +1719,11 @@ int symbol__annotate(struct symbol *sym, struct map *map,
                 }
         }
 
-        return symbol__disassemble(sym, &args);
+        err = symbol__disassemble(sym, &args);
+        if (err)
+                return err;
+
+        return symbol__calc_percent(sym, evsel);
 }
 
 static void insert_source_line(struct rb_root *root, struct source_line *src_line)