Re: [PATCH v1] perf record: encode -k clockid frequency into Perf trace

Jiri Olsa
2018-09-27T16:02:31Z

On Thu, Sep 27, 2018 at 03:54:03PM +0300, Alexey Budankov wrote:
>
> 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: Alexey Budankov <alexey.budankov@linux.intel.com>

looks good, few nits below

thanks,
jirka

> ---
> tools/perf/builtin-record.c | 26 ++++++++++++++++++++++++--
> tools/perf/perf.h | 1 +
> tools/perf/util/env.h | 1 +
> tools/perf/util/header.c | 32 ++++++++++++++++++++++++++++++++
> tools/perf/util/header.h | 1 +
> 5 files changed, 59 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 0980dfe3396b..f215daf28508 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -592,6 +592,11 @@ 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_freq)
> + session->header.env.clockid_freq = rec->opts.clockid_freq;
> + else
> + perf_header__clear_feat(&session->header, HEADER_CLOCKID);
> +
> perf_header__clear_feat(&session->header, HEADER_STAT);
> }
>
> @@ -1337,6 +1342,22 @@ static const struct clockid_map clockids[] = {
> CLOCKID_END,
> };
>
> +#define NSEC_IN_SEC (1000 * 1000 * 1000)

we have that one already:

../include/linux/time64.h:#define NSEC_PER_SEC 1000000000L

> +
> +static int get_clockid_freq(clockid_t clk_id, size_t *freq)
> +{
> + size_t period_ns;
> + struct timespec res;
> +
> + *freq = 0;
> + if (!clock_getres(clk_id, &res)) {
> + period_ns = res.tv_nsec + res.tv_sec * NSEC_IN_SEC;
> + *freq = period_ns * 1000; /* MHz */

let's multiply it when we display it no?
the field is called clockid_freq anyway...

> + }
> +
> + 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 +1381,7 @@ 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_freq(opts->clockid, &opts->clockid_freq);
>
> /* allow a "CLOCK_" prefix to the name */
> if (!strncasecmp(str, "CLOCK_", 6))
> @@ -1369,7 +1390,8 @@ 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_freq(opts->clockid,
> + &opts->clockid_freq);
> }
> }
>
> diff --git a/tools/perf/perf.h b/tools/perf/perf.h
> index 21bf7f5a3cf5..7f612f296b64 100644
> --- a/tools/perf/perf.h
> +++ b/tools/perf/perf.h
> @@ -81,6 +81,7 @@ struct record_opts {
> unsigned initial_delay;
> bool use_clockid;
> clockid_t clockid;
> + size_t clockid_freq;
> unsigned int proc_map_timeout;
> };
>
> diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
> index 1f3ccc368530..ffb358f1ff1e 100644
> --- a/tools/perf/util/env.h
> +++ b/tools/perf/util/env.h
> @@ -63,6 +63,7 @@ struct perf_env {
> struct numa_node *numa_nodes;
> struct memory_node *memory_nodes;
> unsigned long long memory_bsize;
> + size_t clockid_freq;
> };
>
> extern struct perf_env perf_env;
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index 1ec1d9bc2d63..a37c40478b64 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -1034,6 +1034,19 @@ static int write_auxtrace(struct feat_fd *ff,
> return err;
> }
>
> +static int write_clockid(struct feat_fd *ff,
> + struct perf_evlist *evlist __maybe_unused)
> +{
> + int ret;
> +
> + ret = do_write(ff, &ff->ph->env.clockid_freq,
> + sizeof(ff->ph->env.clockid_freq));
> + if (ret < 0)
> + return ret;
> +
> + return 0;

can't you just do: "return do_write(..." in here?

> +}
> +
> 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 +1521,11 @@ 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: %ld MHz\n", ff->ph->env.clockid_freq);
> +}
> +
> static void free_event_desc(struct perf_evsel *events)
> {
> struct perf_evsel *evsel;
> @@ -2531,6 +2549,19 @@ static int process_mem_topology(struct feat_fd *ff,
> return ret;
> }
>
> +static int process_clockid(struct feat_fd *ff,
> + void *data __maybe_unused)
> +{
> + size_t clockid_freq;
> +
> + if (do_read_u64(ff, &clockid_freq))
> + return -1;
> +
> + ff->ph->env.clockid_freq = clockid_freq;
> +
> + 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 +2621,7 @@ 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 {
> diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
> index e17903caa71d..0d553ddca0a3 100644
> --- a/tools/perf/util/header.h
> +++ b/tools/perf/util/header.h
> @@ -38,6 +38,7 @@ enum {
> HEADER_CACHE,
> HEADER_SAMPLE_TIME,
> HEADER_MEM_TOPOLOGY,
> + HEADER_CLOCKID,
> HEADER_LAST_FEATURE,
> HEADER_FEAT_BITS = 256,
> };