linux-kernel - [tip:perf/core] perf evlist: Set the correct idx when adding dummy events

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Message-ID: <tip-nrdfchshqxf7diszhxcecqb9@git.kernel.org>
Date:   Sat, 18 Nov 2017 00:10:09 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, tglx@...utronix.de, b.stolk@...il.com,
        linux-kernel@...r.kernel.org, hpa@...or.com, wangnan0@...wei.com,
        mingo@...nel.org, dsahern@...il.com, adrian.hunter@...el.com,
        acme@...hat.com, jolsa@...nel.org
Subject: [tip:perf/core] perf evlist: Set the correct idx when adding dummy
 events

Commit-ID:  640d5175a671cd0df0b9e3b5935dc80fc5248973
Gitweb:     https://git.kernel.org/tip/640d5175a671cd0df0b9e3b5935dc80fc5248973
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Fri, 3 Nov 2017 15:13:29 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 13 Nov 2017 09:39:57 -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
events.

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 <adrian.hunter@...el.com>
Cc: Bram Stolk <b.stolk@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-nrdfchshqxf7diszhxcecqb9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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;