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-rw-r--r--tools/perf/Documentation/perf.data-file-format.txt13
-rw-r--r--tools/perf/builtin-record.c41
-rw-r--r--tools/perf/util/env.h12
-rw-r--r--tools/perf/util/header.c113
-rw-r--r--tools/perf/util/header.h1
5 files changed, 180 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index b6472e463284..9ee96640744e 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -389,6 +389,19 @@ struct {
Example:
cpu pmu capabilities: branches=32, max_precise=3, pmu_name=icelake
+ HEADER_CLOCK_DATA = 29,
+
+ Contains clock id and its reference time together with wall clock
+ time taken at the 'same time', both values are in nanoseconds.
+ The format of data is as below.
+
+struct {
+ u32 version; /* version = 1 */
+ u32 clockid;
+ u64 wall_clock_ns;
+ u64 clockid_time_ns;
+};
+
other bits are reserved and should ignored for now
HEADER_FEAT_BITS = 256,
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index c9a07a1a75af..b21a8769db21 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -71,6 +71,7 @@
#include <linux/time64.h>
#include <linux/zalloc.h>
#include <linux/bitmap.h>
+#include <sys/time.h>
struct switch_output {
bool enabled;
@@ -1204,6 +1205,9 @@ static void record__init_features(struct record *rec)
if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
perf_header__clear_feat(&session->header, HEADER_CLOCKID);
+ if (!rec->opts.use_clockid)
+ perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
+
perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
if (!record__comp_enabled(rec))
perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
@@ -1552,6 +1556,40 @@ static int record__setup_sb_evlist(struct record *rec)
return 0;
}
+static int record__init_clock(struct record *rec)
+{
+ struct perf_session *session = rec->session;
+ struct timespec ref_clockid;
+ struct timeval ref_tod;
+ u64 ref;
+
+ if (!rec->opts.use_clockid)
+ return 0;
+
+ session->header.env.clock.clockid = rec->opts.clockid;
+
+ if (gettimeofday(&ref_tod, NULL) != 0) {
+ pr_err("gettimeofday failed, cannot set reference time.\n");
+ return -1;
+ }
+
+ if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
+ pr_err("clock_gettime failed, cannot set reference time.\n");
+ return -1;
+ }
+
+ ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
+ (u64) ref_tod.tv_usec * NSEC_PER_USEC;
+
+ session->header.env.clock.tod_ns = ref;
+
+ ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
+ (u64) ref_clockid.tv_nsec;
+
+ session->header.env.clock.clockid_ns = ref;
+ return 0;
+}
+
static int __cmd_record(struct record *rec, int argc, const char **argv)
{
int err;
@@ -1632,6 +1670,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
return -1;
}
+ if (record__init_clock(rec))
+ return -1;
+
record__init_features(rec);
if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index 1ab2682d5d2b..7218f7db57af 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -100,6 +100,18 @@ struct perf_env {
/* For fast cpu to numa node lookup via perf_env__numa_node */
int *numa_map;
int nr_numa_map;
+
+ /* For real clock time reference. */
+ struct {
+ u64 tod_ns;
+ u64 clockid_ns;
+ int clockid;
+ /*
+ * enabled is valid for report mode, and is true if above
+ * values are set, it's set in process_clock_data
+ */
+ bool enabled;
+ } clock;
};
enum perf_compress_type {
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7a67d017d72c..eece94cf6f86 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -46,6 +46,7 @@
#include "util/util.h" // perf_exe()
#include "cputopo.h"
#include "bpf-event.h"
+#include "clockid.h"
#include <linux/ctype.h>
#include <internal/lib.h>
@@ -895,6 +896,40 @@ static int write_clockid(struct feat_fd *ff,
sizeof(ff->ph->env.clockid_res_ns));
}
+static int write_clock_data(struct feat_fd *ff,
+ struct evlist *evlist __maybe_unused)
+{
+ u64 *data64;
+ u32 data32;
+ int ret;
+
+ /* version */
+ data32 = 1;
+
+ ret = do_write(ff, &data32, sizeof(data32));
+ if (ret < 0)
+ return ret;
+
+ /* clockid */
+ data32 = ff->ph->env.clock.clockid;
+
+ ret = do_write(ff, &data32, sizeof(data32));
+ if (ret < 0)
+ return ret;
+
+ /* TOD ref time */
+ data64 = &ff->ph->env.clock.tod_ns;
+
+ ret = do_write(ff, data64, sizeof(*data64));
+ if (ret < 0)
+ return ret;
+
+ /* clockid ref time */
+ data64 = &ff->ph->env.clock.clockid_ns;
+
+ return do_write(ff, data64, sizeof(*data64));
+}
+
static int write_dir_format(struct feat_fd *ff,
struct evlist *evlist __maybe_unused)
{
@@ -1549,6 +1584,49 @@ static void print_clockid(struct feat_fd *ff, FILE *fp)
ff->ph->env.clockid_res_ns * 1000);
}
+static void print_clock_data(struct feat_fd *ff, FILE *fp)
+{
+ struct timespec clockid_ns;
+ char tstr[64], date[64];
+ struct timeval tod_ns;
+ clockid_t clockid;
+ struct tm ltime;
+ u64 ref;
+
+ if (!ff->ph->env.clock.enabled) {
+ fprintf(fp, "# reference time disabled\n");
+ return;
+ }
+
+ /* Compute TOD time. */
+ ref = ff->ph->env.clock.tod_ns;
+ tod_ns.tv_sec = ref / NSEC_PER_SEC;
+ ref -= tod_ns.tv_sec * NSEC_PER_SEC;
+ tod_ns.tv_usec = ref / NSEC_PER_USEC;
+
+ /* Compute clockid time. */
+ ref = ff->ph->env.clock.clockid_ns;
+ clockid_ns.tv_sec = ref / NSEC_PER_SEC;
+ ref -= clockid_ns.tv_sec * NSEC_PER_SEC;
+ clockid_ns.tv_nsec = ref;
+
+ clockid = ff->ph->env.clock.clockid;
+
+ if (localtime_r(&tod_ns.tv_sec, &ltime) == NULL)
+ snprintf(tstr, sizeof(tstr), "<error>");
+ else {
+ strftime(date, sizeof(date), "%F %T", &ltime);
+ scnprintf(tstr, sizeof(tstr), "%s.%06d",
+ date, (int) tod_ns.tv_usec);
+ }
+
+ fprintf(fp, "# clockid: %s (%u)\n", clockid_name(clockid), clockid);
+ fprintf(fp, "# reference time: %s = %ld.%06d (TOD) = %ld.%09ld (%s)\n",
+ tstr, tod_ns.tv_sec, (int) tod_ns.tv_usec,
+ clockid_ns.tv_sec, clockid_ns.tv_nsec,
+ clockid_name(clockid));
+}
+
static void print_dir_format(struct feat_fd *ff, FILE *fp)
{
struct perf_session *session;
@@ -2738,6 +2816,40 @@ static int process_clockid(struct feat_fd *ff,
return 0;
}
+static int process_clock_data(struct feat_fd *ff,
+ void *_data __maybe_unused)
+{
+ u32 data32;
+ u64 data64;
+
+ /* version */
+ if (do_read_u32(ff, &data32))
+ return -1;
+
+ if (data32 != 1)
+ return -1;
+
+ /* clockid */
+ if (do_read_u32(ff, &data32))
+ return -1;
+
+ ff->ph->env.clock.clockid = data32;
+
+ /* TOD ref time */
+ if (do_read_u64(ff, &data64))
+ return -1;
+
+ ff->ph->env.clock.tod_ns = data64;
+
+ /* clockid ref time */
+ if (do_read_u64(ff, &data64))
+ return -1;
+
+ ff->ph->env.clock.clockid_ns = data64;
+ ff->ph->env.clock.enabled = true;
+ return 0;
+}
+
static int process_dir_format(struct feat_fd *ff,
void *_data __maybe_unused)
{
@@ -3008,6 +3120,7 @@ const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPR(BPF_BTF, bpf_btf, false),
FEAT_OPR(COMPRESSED, compressed, false),
FEAT_OPR(CPU_PMU_CAPS, cpu_pmu_caps, false),
+ FEAT_OPR(CLOCK_DATA, clock_data, false),
};
struct header_print_data {
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 650bd1c7a99b..2aca71763ecf 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -44,6 +44,7 @@ enum {
HEADER_BPF_BTF,
HEADER_COMPRESSED,
HEADER_CPU_PMU_CAPS,
+ HEADER_CLOCK_DATA,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 18:30:10 +0000