linux-kernel - [PATCH v4 9/9] perf annotate: Calculate the percentage with period or number of samples

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Date:   Fri, 28 Jul 2017 01:16:43 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH v4 9/9] perf annotate: Calculate the percentage with period or number of samples

To correspond with perf-report using the sample period
for the percentage calculation, calculate the percentage with period.
But if --show-nr-samples was used,
figure out the percentage by number of samples.

Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Signed-off-by: Taeung Song <treeze.taeung@...il.com>
---
 tools/perf/util/annotate.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 522b67b..cb0080b 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -968,9 +968,13 @@ double disasm__calc_percent(struct annotation *notes, int evidx, s64 offset,
 		}
 
 		if (h->period) {
-			sample->period	   = period;
 			sample->nr_samples = hits;
-			percent = 100.0 * hits / h->nr_samples;
+			sample->period = period;
+
+			if (symbol_conf.show_nr_samples)
+				percent = 100.0 * hits / h->nr_samples;
+			else
+				percent = 100.0 * period / h->period;
 		}
 	}
 
@@ -1710,6 +1714,7 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
 	for (i = 0; i < len; i++) {
 		u64 offset;
 		double percent_max = 0.0;
+		struct sym_hist_entry sample;
 
 		src_line->nr_pcnt = nr_pcnt;
 
@@ -1717,14 +1722,18 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
 			double percent = 0.0;
 
 			h = annotation__histogram(notes, evidx + k);
-			nr_samples = h->addr[i].nr_samples;
-			if (h->period)
-				percent = 100.0 * nr_samples / h->nr_samples;
+			sample = h->addr[i];
+			if (h->period) {
+				if (symbol_conf.show_nr_samples)
+					percent = 100.0 * sample.nr_samples / h->nr_samples;
+				else
+					percent = 100.0 * sample.period / h->period;
+			}
 
 			if (percent > percent_max)
 				percent_max = percent;
 			src_line->samples[k].percent = percent;
-			src_line->samples[k].nr = nr_samples;
+			src_line->samples[k].nr = sample.nr_samples;
 		}
 
 		if (percent_max <= 0.5)
-- 
2.7.4