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Date:   Tue, 28 Nov 2017 22:27:43 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <>
Subject: [tip:perf/core] perf evlist: Set the correct idx when adding dummy

Commit-ID:  555b4ec4d589eb0fcdf9d7b4b05a71984dbcaeee
Author:     Arnaldo Carvalho de Melo <>
AuthorDate: Fri, 3 Nov 2017 15:13:29 -0300
Committer:  Arnaldo Carvalho de Melo <>
CommitDate: Tue, 28 Nov 2017 14:19:00 -0300

perf evlist: Set the correct idx when adding dummy events

The evsel->idx field is used mainly to access the right bucket in
per-event arrays such as the annotation ones, but also to set
evsel->tracking, that in turn will decide what of the events will ask
for PERF_RECORD_{MMAP,COMM,EXEC} to be generated, i.e. which
perf_event_attr will have its mmap, etc fields set.

When we were adding the "dummy" event using perf_evlist__add_dummy() we
were not setting it correctly, which could result in multiple tracking

Now that I'll try using a dummy event to be the tracking one when using
'perf record --delay', i.e. when we process the --delay
setting we may already have the evlist set up, like with:

  perf record -e cycles,instructions --delay 1000 ./workload

We will need to add a "dummy" event, then reset evsel->tracking for the
first event, "cycles", and set it instead to the dummy one, and also
setting its attr.enable_on_exec, so that we get the PERF_RECORD_MMAP,
etc metadata events while waiting to enable the explicitely requested
events, so lets get this straight and set the right evsel->idx.

Cc: Adrian Hunter <>
Cc: Bram Stolk <>
Cc: David Ahern <>
Cc: Jiri Olsa <>
Cc: Namhyung Kim <>
Cc: Wang Nan <>
Signed-off-by: Arnaldo Carvalho de Melo <>
 tools/perf/util/evlist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index c6c891e..ccb749f 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -257,7 +257,7 @@ int perf_evlist__add_dummy(struct perf_evlist *evlist)
 		.config = PERF_COUNT_SW_DUMMY,
 		.size	= sizeof(attr), /* to capture ABI version */
-	struct perf_evsel *evsel = perf_evsel__new(&attr);
+	struct perf_evsel *evsel = perf_evsel__new_idx(&attr, evlist->nr_entries);
 	if (evsel == NULL)
 		return -ENOMEM;

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