linux-kernel - [PATCH 3.16 120/136] perf tools: Fix time sorting

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Date:   Tue, 17 Dec 2019 00:47:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Jiri Olsa" <jolsa@...nel.org>,
        "Michael Petlan" <mpetlan@...hat.com>,
        "Alexander Shishkin" <alexander.shishkin@...ux.intel.com>,
        "Namhyung Kim" <namhyung@...nel.org>,
        "Arnaldo Carvalho de Melo" <acme@...hat.com>,
        "Andi Kleen" <ak@...ux.intel.com>,
        "Peter Zijlstra" <peterz@...radead.org>
Subject: [PATCH 3.16 120/136] perf tools: Fix time sorting

3.16.80-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jiri Olsa <jolsa@...nel.org>

commit 722ddfde366fd46205456a9c5ff9b3359dc9a75e upstream.

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

Check the following report for longer workloads:

  $ perf report -s time -F time,overhead --stdio

Fix hist_entry__sort() to properly return int64_t and not possible cut
int.

Fixes: 043ca389a318 ("perf tools: Use hpp formats to sort final output")
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lore.kernel.org/lkml/20191104232711.16055-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 tools/perf/util/hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1032,7 +1032,7 @@ void hists__collapse_resort(struct hists
 	}
 }
 
-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 perf_hpp_fmt *fmt;
 	int64_t cmp = 0;