linux-kernel - [tip:perf/core] perf trace: Only insert blank duration bracket when tracing syscalls

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Date:	Thu, 26 Feb 2015 03:31:15 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, dsahern@...il.com,
	fweisbec@...il.com, dzickus@...hat.com, jolsa@...hat.com,
	eranian@...gle.com, adrian.hunter@...el.com, acme@...hat.com,
	hpa@...or.com, tglx@...utronix.de, bp@...e.de, namhyung@...nel.org,
	peterz@...radead.org, efault@....de
Subject: [tip:perf/core] perf trace:
  Only insert blank duration bracket when tracing syscalls

Commit-ID:  0808921a14ffa170186288508c807f2166b7d8df
Gitweb:     http://git.kernel.org/tip/0808921a14ffa170186288508c807f2166b7d8df
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 19 Feb 2015 21:51:50 -0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Sun, 22 Feb 2015 22:13:54 -0300

perf trace: Only insert blank duration bracket when tracing syscalls

When printing just events, i.e. '--no-sys --ev some:events' it makes no
sense to waste screen space.

Before:

 # trace --no-sys --ev probe:*
 84481.704 (         ): probe:vfs_getname:(ffffffff811ed023) pathname="/etc/services")
 84481.892 (         ): probe:vfs_getname:(ffffffff811ed023) pathname="/etc/services")
 84482.230 (         ): probe:vfs_getname:(ffffffff811ed023) pathname="/etc/resolv.conf")
 84482.481 (         ): probe:vfs_getname:(ffffffff811ed023) pathname="/etc/hosts")
 85097.725 (         ): probe:vfs_getname:(ffffffff811ed023) pathname="/root"
 #

After:

 # trace --no-sys --ev probe:*
 0.000 probe:vfs_getname:(ffffffff811ed023) pathname="/root")
 1.711 probe:vfs_getname:(ffffffff811ed023) pathname="/etc/localtime")
 2.103 probe:vfs_getname:(ffffffff811ed023) pathname="/etc/localtime")
^C#

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-jhryxgnam8zecq0q0wsy6pyb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index b1c1df9..3a696aa 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1840,7 +1840,11 @@ static int trace__event_handler(struct trace *trace, struct perf_evsel *evsel,
 {
 	trace__printf_interrupted_entry(trace, sample);
 	trace__fprintf_tstamp(trace, sample->time, trace->output);
-	fprintf(trace->output, "(%9.9s): %s:", " ", evsel->name);
+
+	if (trace->trace_syscalls)
+		fprintf(trace->output, "(         ): ");
+
+	fprintf(trace->output, "%s:", evsel->name);
 
 	if (evsel->tp_format) {
 		event_format__fprintf(evsel->tp_format, sample->cpu,
--
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