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Subject[PATCH 5/6] perf script: Prepend lines with time-of-day string
Date
Handle realtime-clock events and setting reference times that are then used
to correlate perf_clock times with time-of-day. Output lines are then
prepended with a time-of-day string if the --tod option was used with
perf-record.

Was:

swapper-0 [000] 5329.151669: context-switches: ...
perf-5701 [001] 5329.151797: context-switches: ...
sleep-5702 [000] 5329.155550: context-switches: ...
swapper-0 [001] 5329.158074: context-switches: ...

Now:

20:07:14.903936 swapper-0 [000] 5329.151669: context-switches: ...
20:07:14.904065 perf-5701 [001] 5329.151797: context-switches: ...
20:07:14.907817 sleep-5702 [000] 5329.155550: context-switches: ...
20:07:14.910342 swapper-0 [001] 5329.158074: context-switches: ...

Similarly for tracepoints:

20:11:11.659801 perf-5714 [001] 5565.907534: sched_switch: ...
20:11:11.659812 swapper-0 [001] 5565.907544: sched_switch: ...
20:11:11.659828 ksoftirqd/1-9 [001] 5565.907560: sched_switch: ...
20:11:12.857334 swapper-0 [001] 5567.105067: sched_switch: ...

Signed-off-by: David Ahern <daahern@cisco.com>
---
tools/perf/builtin-script.c | 26 +++++++++++-
tools/perf/util/event.c | 95 +++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/event.h | 10 +++++
tools/perf/util/session.c | 12 ++++--
tools/perf/util/session.h | 2 +-
5 files changed, 139 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 4f4c63b..427c257 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -21,6 +21,8 @@ static u64 nr_unordered;
extern const struct option record_options[];
static bool hide_unresolved;
static bool no_callchain;
+static struct timeval tv_ref;
+static u64 timestamp_ref;

static int default_start_script(const char *script __unused,
int argc __unused,
@@ -73,6 +75,7 @@ static int process_sample_event(union perf_event *event,
struct addr_location al;
struct thread *thread = perf_session__findnew(session, event->ip.pid);
const char *evname = NULL;
+ const char *tstr = NULL;
static bool check_raw = true;

if (thread == NULL) {
@@ -88,6 +91,16 @@ static int process_sample_event(union perf_event *event,
return -1;
}

+ if ((attr->type == PERF_TYPE_SOFTWARE) &&
+ (attr->config == PERF_COUNT_SW_REALTIME_CLOCK) &&
+ (perf_event__process_rclk(sample, session,
+ &tv_ref, &timestamp_ref) == 0))
+ return 0;
+
+
+ if (session->sample_type & PERF_SAMPLE_TIME)
+ tstr = perf_event__timestr(sample, session, timestamp_ref, &tv_ref);
+
switch (attr->type) {
case PERF_TYPE_SOFTWARE:
if (perf_event__preprocess_sample(event, session, &al, sample,
@@ -96,7 +109,7 @@ static int process_sample_event(union perf_event *event,
event->header.type);
return -1;
}
- perf_session__print_sample(session, &al, sample, hide_unresolved);
+ perf_session__print_sample(session, &al, sample, hide_unresolved, tstr);
break;

case PERF_TYPE_TRACEPOINT:
@@ -116,6 +129,9 @@ static int process_sample_event(union perf_event *event,
last_timestamp = sample->time;
return 0;
}
+ if (tstr)
+ printf("%15s ", tstr);
+
/*
* FIXME: better resolve from pid from the struct trace_entry
* field, although it should be the same than this perf
@@ -137,6 +153,13 @@ static int process_sample_event(union perf_event *event,
return 0;
}

+static int process_reftime_event(union perf_event *event,
+ struct perf_session *session)
+{
+ return perf_event__process_reftime(event, session,
+ &tv_ref, &timestamp_ref);
+}
+
static struct perf_event_ops event_ops = {
.sample = process_sample_event,
.comm = perf_event__process_comm,
@@ -144,6 +167,7 @@ static struct perf_event_ops event_ops = {
.event_type = perf_event__process_event_type,
.tracing_data = perf_event__process_tracing_data,
.build_id = perf_event__process_build_id,
+ .reftime = process_reftime_event,
.ordered_samples = true,
.ordering_requires_timestamps = true,
};
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 6bbd551..ca1f56d 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -1,4 +1,6 @@
#include <linux/types.h>
+#include <sys/time.h>
+#include <time.h>
#include "event.h"
#include "debug.h"
#include "session.h"
@@ -847,3 +849,96 @@ out_filtered:
al->filtered = true;
return 0;
}
+
+int perf_event__process_rclk(struct perf_sample *sample,
+ struct perf_session *session, struct timeval *tv,
+ u64 *ts)
+{
+ u64 s;
+
+ if (!(session->sample_type & PERF_SAMPLE_READ)) {
+ static bool show_msg = true;
+ if (show_msg) {
+ printf("rclk sample does not have event data.\n"
+ "Was record done with --timehist option?\n");
+ show_msg = false;
+ }
+ return -1;
+ }
+
+ if (!(session->sample_type & PERF_SAMPLE_TIME)) {
+ printf("rclk sample does not have kernel sample time\n");
+ return -1;
+ }
+
+ /* convert raw sample to wall-clock reference time */
+ s = sample->values.value;
+ tv->tv_sec = s / NSEC_PER_SEC;
+ tv->tv_usec = (s - tv->tv_sec * NSEC_PER_SEC) / 1000;
+
+ /* match event sample with kernel timestamp */
+ *ts= sample->time;
+
+ return 0;
+}
+
+/*
+ * process synthesized reference time event
+ */
+int perf_event__process_reftime(union perf_event *event,
+ struct perf_session *session __used,
+ struct timeval *tv, u64 *ts)
+{
+ *tv = event->reftime.tv;
+ *ts = event->reftime.nsec;
+
+ return 0;
+}
+
+const char *perf_event__timestr(struct perf_sample *sample,
+ struct perf_session *session,
+ u64 tsref, struct timeval *tvref)
+{
+ static char buf[64];
+ u64 dt;
+ struct tm ltime;
+ struct timeval tv_dt, tv_res;
+ const char *fmt = "%H:%M:%S";
+
+ buf[0] = '\0';
+
+ /* no sample time in sample data */
+ if (!(session->sample_type & PERF_SAMPLE_TIME))
+ return NULL;
+
+ if (tsref == 0) {
+ static bool show_msg = true;
+ if (show_msg) {
+ if (verbose)
+ warning("Reference clock event not seen yet; "
+ "Cannot generate wall-clock time strings until then.\n");
+ show_msg = false;
+ }
+ return NULL;
+ }
+
+ if (sample->time > tsref) {
+ dt = sample->time - tsref;
+ tv_dt.tv_sec = (time_t) (dt / NSEC_PER_SEC);
+ tv_dt.tv_usec = (dt - tv_dt.tv_sec * NSEC_PER_SEC) / 1000;
+ timeradd(tvref, &tv_dt, &tv_res);
+ } else {
+ dt = tsref - sample->time;
+ tv_dt.tv_sec = (time_t) (dt / NSEC_PER_SEC);
+ tv_dt.tv_usec = (dt - tv_dt.tv_sec * NSEC_PER_SEC) / 1000;
+ timersub(tvref, &tv_dt, &tv_res);
+ }
+
+ if (localtime_r(&tv_res.tv_sec, &ltime) != NULL) {
+ char date[64];
+ strftime(date, sizeof(date), fmt, &ltime);
+ snprintf(buf, sizeof(buf), "%s.%06ld", date, tv_res.tv_usec);
+ }
+
+ return buf;
+}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index d4810e0..22e2af8 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -196,4 +196,14 @@ const char *perf_event__name(unsigned int id);
int perf_event__parse_sample(const union perf_event *event, u64 type,
u64 read_format, bool sample_id_all, struct perf_sample *sample);

+int perf_event__process_rclk(struct perf_sample *sample,
+ struct perf_session *session, struct timeval *tv, u64 *ts);
+
+int perf_event__process_reftime(union perf_event *event,
+ struct perf_session *session, struct timeval *tv, u64 *ts);
+
+const char *perf_event__timestr(struct perf_sample *sample,
+ struct perf_session *session,
+ u64 tsref, struct timeval *tvref);
+
#endif /* __PERF_RECORD_H */
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 7d46351..b68fd4f 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1157,8 +1157,12 @@ size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,

static inline void print_sample(const char *comm, pid_t pid,
u32 cpu, u64 secs, u64 usecs, const char *evname,
- u64 addr, const char *symname, const char *dsoname)
+ u64 addr, const char *symname, const char *dsoname,
+ const char *timestr)
{
+ if (timestr)
+ printf("%15s ", timestr);
+
printf("%16s-%-5d ", comm, pid);

if (cpu != (u32) -1)
@@ -1175,7 +1179,7 @@ static inline void print_sample(const char *comm, pid_t pid,
void perf_session__print_sample(struct perf_session *session,
struct addr_location *al,
struct perf_sample *sample,
- bool hide_unresolved)
+ bool hide_unresolved, const char *timestr)
{
struct callchain_cursor_node *node, *prev;
struct perf_event_attr *attr;
@@ -1228,7 +1232,7 @@ void perf_session__print_sample(struct perf_session *session,
continue;

print_sample(comm, al->thread->pid, cpu, secs, usecs,
- evname, node->ip, symname, dsoname);
+ evname, node->ip, symname, dsoname, timestr);

prev = node;
node = node->next;
@@ -1244,6 +1248,6 @@ void perf_session__print_sample(struct perf_session *session,
dsoname = al->map->dso->name;

print_sample(comm, al->thread->pid, cpu, secs, usecs,
- evname, al->addr, symname, dsoname);
+ evname, al->addr, symname, dsoname, timestr);
}
}
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index ff8791d..a4f1c4f 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -172,5 +172,5 @@ static inline int perf_session__parse_sample(struct perf_session *session,

void perf_session__print_sample(struct perf_session *session,
struct addr_location *al, struct perf_sample *sample,
- bool hide_unresolved);
+ bool hide_unresolved, const char *timestr);
#endif /* __PERF_SESSION_H */
--
1.7.4


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