linux-kernel - [PATCH v4 8/9] perf annotate: Check total period before calculating percent

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Date:   Fri, 28 Jul 2017 01:16:36 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH v4 8/9] perf annotate: Check total period before calculating percent

Before calculating percent, checking total period
is clear and safer than checking just number of samples.
So fix it.

Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Taeung Song <treeze.taeung@...il.com>
---
 tools/perf/util/annotate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 7032bdc..522b67b 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -967,7 +967,7 @@ double disasm__calc_percent(struct annotation *notes, int evidx, s64 offset,
 			period += h->addr[offset++].period;
 		}
 
-		if (h->nr_samples) {
+		if (h->period) {
 			sample->period	   = period;
 			sample->nr_samples = hits;
 			percent = 100.0 * hits / h->nr_samples;
@@ -1718,7 +1718,7 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
 
 			h = annotation__histogram(notes, evidx + k);
 			nr_samples = h->addr[i].nr_samples;
-			if (h->nr_samples)
+			if (h->period)
 				percent = 100.0 * nr_samples / h->nr_samples;
 
 			if (percent > percent_max)
-- 
2.7.4