[PATCH 26/47] perf tools: Introduce stat feature

Jiri Olsa
2015-07-21T12:39:31Z

Introducing stat feature to mark perf.data as created by
perf stat record command. It contains no data.

It's needed for report tools (report/script) to differentiate
sampling data from stat data, because they need to be treated
in a different way.

Link: http://lkml.kernel.org/n/tip-56xpt7m6au4d8u39nffoqgx1@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-record.c | 2 ++
tools/perf/util/header.c | 14 ++++++++++++++
tools/perf/util/header.h | 1 +
3 files changed, 17 insertions(+)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 283fe96bdfc1..68dda0cffc4e 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -449,6 +449,8 @@ static void record__init_features(struct record *rec)

if (!rec->opts.full_auxtrace)
perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
+
+ perf_header__clear_feat(&session->header, HEADER_STAT);
}

static volatile int workload_exec_errno;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 179b2bdd157d..1eb17453d78b 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -883,6 +883,13 @@ static int write_auxtrace(int fd, struct perf_header *h,
return err;
}

+static int write_stat(int fd __maybe_unused,
+ struct perf_header *h __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
+{
+ return 0;
+}
+
static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
@@ -1166,6 +1173,12 @@ static void print_auxtrace(struct perf_header *ph __maybe_unused,
fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
}

+static void print_stat(struct perf_header *ph __maybe_unused,
+ int fd __maybe_unused, FILE *fp)
+{
+ fprintf(fp, "# contains stat data\n");
+}
+
static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
@@ -1899,6 +1912,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPP(HEADER_PMU_MAPPINGS, pmu_mappings),
FEAT_OPP(HEADER_GROUP_DESC, group_desc),
FEAT_OPP(HEADER_AUXTRACE, auxtrace),
+ FEAT_OPA(HEADER_STAT, stat),
};

struct header_print_data {
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 9b53b6525ce8..5ef500777428 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -31,6 +31,7 @@ enum {
HEADER_PMU_MAPPINGS,
HEADER_GROUP_DESC,
HEADER_AUXTRACE,
+ HEADER_STAT,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
--
2.4.3