linux-kernel - [PATCH] perf tools: Fix time sorting

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Date:   Tue,  5 Nov 2019 00:27:11 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: [PATCH] perf tools: Fix time sorting

The final sort might get confused when the comparison
is done over bigger numbers than int like for -s time.

Check following report for longer workloads:
  $ perf report -s time -F time,overhead --stdio

Fixing hist_entry__sort to properly return int64_t and
not possible cut int.

Cc: Andi Kleen <ak@...ux.intel.com>
Link: http://lkml.kernel.org/n/tip-uetl5z1eszpubzqykvdftaq6@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 679a1d75090c..7b6eaf5e0bda 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1625,7 +1625,7 @@ int hists__collapse_resort(struct hists *hists, struct ui_progress *prog)
 	return 0;
 }
 
-static int hist_entry__sort(struct hist_entry *a, struct hist_entry *b)
+static int64_t hist_entry__sort(struct hist_entry *a, struct hist_entry *b)
 {
 	struct hists *hists = a->hists;
 	struct perf_hpp_fmt *fmt;
-- 
2.21.0