linux-kernel - [PATCH 4/5] perf record: Don't exit in live mode when no tracepoints are enabled

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Date:	Sun,  2 May 2010 19:59:01 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Tom Zanussi <tzanussi@...il.com>
Subject: [PATCH 4/5] perf record: Don't exit in live mode when no tracepoints are enabled

From: Arnaldo Carvalho de Melo <acme@...hat.com>

With this I was able to actually test Tom Zanussi's two previous patches
in my usual perf testing ways, i.e. without any tracepoints activated.

Cc: Frédéric Weisbecker <fweisbec@...il.com>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Tom Zanussi <tzanussi@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index e382d93..ac989e9 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -666,12 +666,15 @@ static int __cmd_record(int argc, const char **argv)
 						     nr_counters,
 						     process_synthesized_event,
 						     session);
-		if (err <= 0) {
-			pr_err("Couldn't record tracing data.\n");
-			return err;
-		}
-
-		advance_output(err);
+		/*
+		 * FIXME err <= 0 here actually means that there were no tracepoints
+		 * so its not really an error, just that we don't need to synthesize
+		 * anything.
+		 * We really have to return this more properly and also propagate
+		 * errors that now are calling die()
+		 */
+		if (err > 0)
+			advance_output(err);
 	}
 
 	machine = perf_session__find_host_machine(session);
-- 
1.6.2.5

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