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Commit ffa517ad authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarJiri Olsa <jolsa@kernel.org>
Tested-by: default avatarKan 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 2d2aea6a

tools/perf/builtin-record.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

tools/perf/util/header.c

+14 −0
Original line number Diff line number Diff line
@@ -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 {

tools/perf/util/header.h

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ enum { 
	HEADER_PMU_MAPPINGS,

	HEADER_GROUP_DESC,

	HEADER_AUXTRACE,

	HEADER_STAT,

	HEADER_LAST_FEATURE,

	HEADER_FEAT_BITS	= 256,

};