[tip:perf/core] perf record: Synthesize features before events in pipe mode

[tip-bot for Jiri Olsa]

Commit-ID:  a2015516c5c0be932a69e1d3405c2fb03b4eacf1
Gitweb:     https://git.kernel.org/tip/a2015516c5c0be932a69e1d3405c2fb03b4eacf1
Author:     Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Wed, 14 Mar 2018 10:22:04 +0100
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 16 Mar 2018 13:56:50 -0300

perf record: Synthesize features before events in pipe mode

We need to synthesize events first, because some features works on top
of them (on report side).

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Tested-by: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180314092205.23291-1-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-record.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d33103291b02..22ebeb92ac51 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -754,13 +754,10 @@ static int record__synthesize(struct record *rec, bool tail)
 		return 0;
 
 	if (data->is_pipe) {
-		err = perf_event__synthesize_features(
-			tool, session, rec->evlist, process_synthesized_event);
-		if (err < 0) {
-			pr_err("Couldn't synthesize features.\n");
-			return err;
-		}
-
+		/*
+		 * We need to synthesize events first, because some
+		 * features works on top of them (on report side).
+		 */
 		err = perf_event__synthesize_attrs(tool, session,
 						   process_synthesized_event);
 		if (err < 0) {
@@ -768,6 +765,13 @@ static int record__synthesize(struct record *rec, bool tail)
 			goto out;
 		}
 
+		err = perf_event__synthesize_features(tool, session, rec->evlist,
+						      process_synthesized_event);
+		if (err < 0) {
+			pr_err("Couldn't synthesize features.\n");
+			return err;
+		}
+
 		if (have_tracepoints(&rec->evlist->entries)) {
 			/*
 			 * FIXME err <= 0 here actually means that