linux-kernel - [PATCH] perf/tool: remove newline char when reading event scale and unit

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Date:	Sun, 31 May 2015 11:36:23 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH] perf/tool: remove newline char when reading event scale and unit

commit <fd979c013207> intruduced perf_event_sysfs_show function to display
event_str value of an attr in kernel/event/core.c. But the function returns
the value with a newline char. So, if a event also carries a event.unit file,
when printing the counter data perf tool formatting goes for a spin.
That is, because of the event unit, event name is printed in the newline
because of perf_event_sysfs_show returns with a newline char.

Now fixing perf core will break API, hencing proposing a fix in the perf tool.

Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 tools/perf/util/pmu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 4841167..cf2cb34 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -112,7 +112,11 @@ static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *
 	if (sret < 0)
 		goto error;
 
-	scale[sret] = '\0';
+	if (scale[sret-1] == '\n')
+		scale[sret-1] = '\0';
+	else
+		scale[sret] = '\0';
+
 	/*
 	 * save current locale
 	 */
@@ -154,7 +158,10 @@ static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *n
 
 	close(fd);
 
-	alias->unit[sret] = '\0';
+	if (alias->unit[sret-1] == '\n')
+		alias->unit[sret-1] = '\0';
+	else
+		alias->unit[sret] = '\0';
 
 	return 0;
 error:
-- 
1.9.1

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