linux-kernel - [PATCH] perf record: adding dummy event before mapping

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Date:	Fri, 18 Sep 2015 14:42:04 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	a.p.zijlstra@...llo.nl, mingo@...hat.com, acme@...nel.org
Cc:	linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
	mathieu.poirier@...aro.org
Subject: [PATCH] perf record: adding dummy event before mapping

The parameters of function 'perf_evsel__open()' in
'record_open()' have been changed to use the evsel's cpus and
threads rather than the evlist since:

commit d988d5ee6478 ("perf evlist: Open event on evsel cpus and threads")

This works fine for as long as all the events have been added to
the evlist before function 'perf_evlist__create_maps()' is called
since the latter will take care of pushing the cpus and threads of
the evlist to each of the evsel in the list.

As function 'auxtrace_record__options()' adds a "dummy:u" event to
the evlist it is important that it runs before
'perf_evlist__create_maps()'.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 tools/perf/builtin-record.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 142eeb341b29..630a7a8e3970 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1183,14 +1183,14 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 		goto out_symbol_exit;
 	}
 
-	err = -ENOMEM;
-	if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
-		usage_with_options(record_usage, record_options);
-
 	err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
 	if (err)
 		goto out_symbol_exit;
 
+	err = -ENOMEM;
+	if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
+		usage_with_options(record_usage, record_options);
+
 	if (record_opts__config(&rec->opts)) {
 		err = -EINVAL;
 		goto out_symbol_exit;
-- 
1.9.1

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