linux-kernel - [tip:perf/core] perf trace: Support --events foo: bar --no-syscalls

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Message-ID: <tip-vn0hsixsbhm31b2rpj97r96k@git.kernel.org>
Date:	Wed, 18 Feb 2015 10:43:14 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	bp@...e.de, namhyung@...nel.org, efault@....de,
	peterz@...radead.org, adrian.hunter@...el.com, dzickus@...hat.com,
	jolsa@...hat.com, tglx@...utronix.de, acme@...hat.com,
	fweisbec@...il.com, eranian@...gle.com, hpa@...or.com,
	mingo@...nel.org, linux-kernel@...r.kernel.org, dsahern@...il.com
Subject: [tip:perf/core] perf trace: Support --events foo:
 bar --no-syscalls

Commit-ID:  726f3234dd125633438922a07a80f933f13daf82
Gitweb:     http://git.kernel.org/tip/726f3234dd125633438922a07a80f933f13daf82
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Fri, 6 Feb 2015 10:16:45 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 13 Feb 2015 17:30:29 -0300

perf trace: Support --events foo:bar --no-syscalls

I.e. support tracing just tracepoints, without strace like
raw_syscalls:*.

[acme@...andy linux]$ trace --no-sys --ev sched:*exec,sched:*switch,sched:*exit usleep 1
  0.048 (     ): sched:sched_process_exec:filename=/usr/bin/usleep pid=27298 old_pid=27298)
  0.369 (     ): sched:sched_switch:usleep:27298 [120] S ==> swapper/5:0 [120])
  0.452 (     ): sched:sched_process_exit:comm=usleep pid=27298 prio=120)
[acme@...andy linux]$

TODO: remove that (...) thing when --no-syscalls is specified.

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-vn0hsixsbhm31b2rpj97r96k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-trace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index a44ac93..b1c1df9 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2625,7 +2625,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (trace.summary_only)
 		trace.summary = trace.summary_only;
 
-	if (!trace.trace_syscalls && !trace.trace_pgfaults) {
+	if (!trace.trace_syscalls && !trace.trace_pgfaults &&
+	    trace.evlist->nr_entries == 0 /* Was --events used? */) {
 		pr_err("Please specify something to trace.\n");
 		return -1;
 	}
--
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