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perf tools: Introduce stat perf.data header feature 

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

It's needed so that the report tools (report/script) can differentiate
sampling data from counting data, because they need to be treated in a
different way.

In the future it might be used to store the version of the stat storage
system used.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-28-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Jiri Olsa 2015-10-25 15:51:43 +01:00 committed by Arnaldo Carvalho de Melo
parent 2d2aea6ae7
commit ffa517adf6
3 changed files with 17 additions and 0 deletions
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2
tools/perf/builtin-record.c
View File

@ -452,6 +452,8 @@ 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;

14
tools/perf/util/header.c
View File

@ -868,6 +868,13 @@ 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)
{
@ -1159,6 +1166,12 @@ 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)
{
@ -1948,6 +1961,7 @@ 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 {

1
tools/perf/util/header.h
View File

@ -31,6 +31,7 @@ enum {
HEADER_PMU_MAPPINGS,
HEADER_GROUP_DESC,
HEADER_AUXTRACE,
HEADER_STAT,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};