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Commit cf790516 authored by Alexey Budankov's avatar Alexey Budankov Committed by Arnaldo Carvalho de Melo
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perf record: Encode -k clockid frequency into Perf trace 



Store -k clockid frequency into Perf trace to enable timestamps
derived metrics conversion into wall clock time on reporting stage.

Below is the example of perf report output:

  tools/perf/perf record -k raw -- ../../matrix/linux/matrix.gcc
  ...
  [ perf record: Captured and wrote 31.222 MB perf.data (818054 samples) ]

  tools/perf/perf report --header
  # ========
  ...
  # event : name = cycles:ppp, , size = 112, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|PERIOD, disabled = 1, inherit = 1, mmap = 1, comm = 1, freq = 1, enable_on_exec = 1, task = 1, precise_ip = 3, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, use_clockid = 1, clockid = 4
  ...
  # clockid frequency: 1000 MHz
  ...
  # ========

Signed-off-by: default avatarAlexey Budankov <alexey.budankov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/23a4a1dc-b160-85a0-347d-40a2ed6d007b@linux.intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ce6c9da1

tools/perf/builtin-record.c

+22 −2
Original line number Diff line number Diff line
@@ -592,6 +592,9 @@ static void record__init_features(struct record *rec) 
	if (!rec->opts.full_auxtrace)

		perf_header__clear_feat(&session->header, HEADER_AUXTRACE);



	if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))

		perf_header__clear_feat(&session->header, HEADER_CLOCKID);



	perf_header__clear_feat(&session->header, HEADER_STAT);

}
@@ -897,6 +900,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv) 


	record__init_features(rec);



	if (rec->opts.use_clockid && rec->opts.clockid_res_ns)

		session->header.env.clockid_res_ns = rec->opts.clockid_res_ns;



	if (forks) {

		err = perf_evlist__prepare_workload(rec->evlist, &opts->target,

						    argv, data->is_pipe,
@@ -1337,6 +1343,19 @@ static const struct clockid_map clockids[] = { 
	CLOCKID_END,

};



static int get_clockid_res(clockid_t clk_id, u64 *res_ns)

{

	struct timespec res;



	*res_ns = 0;

	if (!clock_getres(clk_id, &res))

		*res_ns = res.tv_nsec + res.tv_sec * NSEC_PER_SEC;

	else

		pr_warning("WARNING: Failed to determine specified clock resolution.\n");



	return 0;

}



static int parse_clockid(const struct option *opt, const char *str, int unset)

{

	struct record_opts *opts = (struct record_opts *)opt->value;
@@ -1360,7 +1379,7 @@ static int parse_clockid(const struct option *opt, const char *str, int unset) 


	/* if its a number, we're done */

	if (sscanf(str, "%d", &opts->clockid) == 1)

		return 0;

		return get_clockid_res(opts->clockid, &opts->clockid_res_ns);



	/* allow a "CLOCK_" prefix to the name */

	if (!strncasecmp(str, "CLOCK_", 6))
@@ -1369,7 +1388,8 @@ static int parse_clockid(const struct option *opt, const char *str, int unset) 
	for (cm = clockids; cm->name; cm++) {

		if (!strcasecmp(str, cm->name)) {

			opts->clockid = cm->clockid;

			return 0;

			return get_clockid_res(opts->clockid,

					       &opts->clockid_res_ns);

		}

	}

tools/perf/perf.h

+1 −0
Original line number Diff line number Diff line
@@ -81,6 +81,7 @@ struct record_opts { 
	unsigned     initial_delay;

	bool         use_clockid;

	clockid_t    clockid;

	u64          clockid_res_ns;

	unsigned int proc_map_timeout;

};

tools/perf/util/env.h

+1 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ struct perf_env { 
	struct numa_node	*numa_nodes;

	struct memory_node	*memory_nodes;

	unsigned long long	 memory_bsize;

	u64                     clockid_res_ns;

};



extern struct perf_env perf_env;

tools/perf/util/header.c

+23 −0
Original line number Diff line number Diff line
@@ -1034,6 +1034,13 @@ static int write_auxtrace(struct feat_fd *ff, 
	return err;

}



static int write_clockid(struct feat_fd *ff,

			 struct perf_evlist *evlist __maybe_unused)

{

	return do_write(ff, &ff->ph->env.clockid_res_ns,

			sizeof(ff->ph->env.clockid_res_ns));

}



static int cpu_cache_level__sort(const void *a, const void *b)

{

	struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
@@ -1508,6 +1515,12 @@ static void print_cpu_topology(struct feat_fd *ff, FILE *fp) 
		fprintf(fp, "# Core ID and Socket ID information is not available\n");

}



static void print_clockid(struct feat_fd *ff, FILE *fp)

{

	fprintf(fp, "# clockid frequency: %"PRIu64" MHz\n",

		ff->ph->env.clockid_res_ns * 1000);

}



static void free_event_desc(struct perf_evsel *events)

{

	struct perf_evsel *evsel;
@@ -2531,6 +2544,15 @@ static int process_mem_topology(struct feat_fd *ff, 
	return ret;

}



static int process_clockid(struct feat_fd *ff,

			   void *data __maybe_unused)

{

	if (do_read_u64(ff, &ff->ph->env.clockid_res_ns))

		return -1;



	return 0;

}



struct feature_ops {

	int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);

	void (*print)(struct feat_fd *ff, FILE *fp);
@@ -2590,6 +2612,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = { 
	FEAT_OPN(CACHE,		cache,		true),

	FEAT_OPR(SAMPLE_TIME,	sample_time,	false),

	FEAT_OPR(MEM_TOPOLOGY,	mem_topology,	true),

	FEAT_OPR(CLOCKID,       clockid,        false)

};



struct header_print_data {

tools/perf/util/header.h

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ enum { 
	HEADER_CACHE,

	HEADER_SAMPLE_TIME,

	HEADER_MEM_TOPOLOGY,

	HEADER_CLOCKID,

	HEADER_LAST_FEATURE,

	HEADER_FEAT_BITS	= 256,

};