linux-kernel - [tip:perf/core] perf time-utils: Prevent percentage time range overlap

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Message-ID: <tip-b16bfeb3db1b50273e95f539953c337be759500d@git.kernel.org>
Date:   Mon, 17 Jun 2019 12:47:15 -0700
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     adrian.hunter@...el.com, tglx@...utronix.de,
        yao.jin@...ux.intel.com, jolsa@...hat.com,
        linux-kernel@...r.kernel.org, hpa@...or.com, acme@...hat.com,
        mingo@...nel.org
Subject: [tip:perf/core] perf time-utils: Prevent percentage time range
 overlap

Commit-ID:  b16bfeb3db1b50273e95f539953c337be759500d
Gitweb:     https://git.kernel.org/tip/b16bfeb3db1b50273e95f539953c337be759500d
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Tue, 4 Jun 2019 16:00:12 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 10 Jun 2019 16:20:12 -0300

perf time-utils: Prevent percentage time range overlap

Prevent percentage time range overlap. This is only a 1 nanosecond
change but makes the results more logical e.g. a sample cannot be in
both the first 10% and the second 20%.

Note, there is a later patch that adds a test for time-utils.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190604130017.31207-15-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/time-utils.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/time-utils.c b/tools/perf/util/time-utils.c
index 69441faab3d0..3e87c21c293c 100644
--- a/tools/perf/util/time-utils.c
+++ b/tools/perf/util/time-utils.c
@@ -148,6 +148,9 @@ static int set_percent_time(struct perf_time_interval *ptime, double start_pcnt,
 	ptime->start = start + round(start_pcnt * total);
 	ptime->end = start + round(end_pcnt * total);
 
+	if (ptime->end > ptime->start && ptime->end != end)
+		ptime->end -= 1;
+
 	return 0;
 }