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Subject[PATCH 4/5] perf script: add support for time-of-day strings in output
Date
Format of time-of-day strings handled through strftime. Any format
recognized by it can be used. Default format is %H:%M:%S with
microseconds appended.

Signed-off-by: David Ahern <daahern@cisco.com>
---
tools/perf/Documentation/perf-script.txt | 8 +++-
tools/perf/builtin-script.c | 84 +++++++++++++++++++++++++++++-
2 files changed, 90 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 66f040b..9f04caa 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -115,7 +115,7 @@ OPTIONS
-f::
--fields
Comma separated list of fields to print. Options are:
- comm, tid, pid, time, cpu, event, trace, sym. Field
+ tod, comm, tid, pid, time, cpu, event, trace, sym. Field
list must be prepended with the type, trace, sw or hw,
to indicate to which event type the field list applies.
e.g., -f sw:comm,tid,time,sym and -f trace:time,cpu,trace
@@ -134,6 +134,12 @@ OPTIONS
--hide-call-graph::
When printing symbols do not display call chain.

+--tod::
+ Format for time-of-day strings. Format string is passed to
+ strftime, so any format recognized by it can be used (see
+ man strftime). Default format is "%H:%M:%S". Microseocnds
+ are appended to the time string.
+
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-script-perl[1],
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 9f5fc54..72c9a34 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -22,6 +22,8 @@ static u64 last_timestamp;
static u64 nr_unordered;
extern const struct option record_options[];
static bool no_callchain;
+static char default_tod_fmt[] = "%H:%M:%S";
+static char *tod_fmt = default_tod_fmt;

enum perf_output_field {
PERF_OUTPUT_COMM = 1U << 0,
@@ -32,6 +34,7 @@ enum perf_output_field {
PERF_OUTPUT_EVNAME = 1U << 5,
PERF_OUTPUT_TRACE = 1U << 6,
PERF_OUTPUT_SYM = 1U << 7,
+ PERF_OUTPUT_TIMEOFDAY = 1U << 8,
};

struct output_option {
@@ -46,6 +49,7 @@ struct output_option {
{.str = "event", .field = PERF_OUTPUT_EVNAME},
{.str = "trace", .field = PERF_OUTPUT_TRACE},
{.str = "sym", .field = PERF_OUTPUT_SYM},
+ {.str = "tod", .field = PERF_OUTPUT_TIMEOFDAY},
};

/* default set to maintain compatibility with current format */
@@ -102,9 +106,35 @@ static int perf_session__check_attr(struct perf_session *session,
return -EINVAL;
}

+ if (PRINT_FIELD(TIMEOFDAY) &&
+ !(session->sample_type & PERF_SAMPLE_REALTIME)) {
+ pr_err("Samples do not contain realtime attribute.\n");
+ pr_err("Was --tod used with perf-record?\n");
+ return -EINVAL;
+ }
+
return 0;
}

+static const char *timeofday_str(u64 realtime)
+{
+ static char buf[64];
+ struct tm ltime;
+ struct timeval tv;
+
+ buf[0] = '\0';
+
+ tv.tv_sec = realtime / NSEC_PER_SEC;
+ tv.tv_usec = (realtime - tv.tv_sec * NSEC_PER_SEC) / 1000;
+ if (localtime_r(&tv.tv_sec, &ltime) != NULL) {
+ char date[128];
+ strftime(date, sizeof(date), tod_fmt, &ltime);
+ snprintf(buf, sizeof(buf), "%s.%06ld", date, tv.tv_usec);
+ }
+
+ return buf;
+}
+
static void print_sample_start(struct perf_sample *sample,
struct thread *thread,
struct perf_event_attr *attr)
@@ -116,6 +146,9 @@ static void print_sample_start(struct perf_sample *sample,
unsigned long usecs;
unsigned long long nsecs;

+ if (PRINT_FIELD(TIMEOFDAY))
+ printf("%s ", timeofday_str(sample->realtime));
+
if (PRINT_FIELD(COMM)) {
if (latency_format)
printf("%8.8s ", thread->comm);
@@ -515,6 +548,49 @@ static int parse_output_fields(const struct option *opt __used,
return rc;
}

+static int parse_tod_format(const struct option *opt __used,
+ const char *arg, int unset __used)
+{
+ int i;
+ char date[128];
+ size_t rc;
+ struct tm ltime;
+
+ if (strlen(arg) == 0) {
+ pr_debug("Time-of-day strings will be suppressed\n");
+ goto out;
+ }
+
+ /* test input string for validity and length of output */
+ localtime_r(0, &ltime);
+ rc = strftime(date, sizeof(date), arg, &ltime);
+ if (rc == 0) {
+ fprintf(stderr, "Invalid format string for time-of-day\n");
+ return -EINVAL;
+ }
+
+out:
+ for (i = 0; i < PERF_TYPE_MAX; ++i) {
+ if (output_fields[i] == 0)
+ continue;
+ if (strlen(arg))
+ output_fields[i] |= PERF_OUTPUT_TIMEOFDAY;
+ else
+ output_fields[i] &= ~PERF_OUTPUT_TIMEOFDAY;
+ }
+
+ if (tod_fmt != default_tod_fmt)
+ free(tod_fmt);
+
+ tod_fmt = strdup(arg);
+ if (!tod_fmt) {
+ fprintf(stderr, "Failed to copy time-of-day format string\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
static int is_directory(const char *base_path, const struct dirent *dent)
{
@@ -836,8 +912,11 @@ static const struct option options[] = {
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_CALLBACK('f', "fields", NULL, "str",
- "comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace. Fields: comm,tid,pid,time,cpu,event,trace,sym",
+ "comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace. Fields: tod,comm,tid,pid,time,cpu,event,trace,sym",
parse_output_fields),
+ OPT_CALLBACK(0, "tod", NULL, "str",
+ "Format for time-of-day strings. Option is passed to strftime; microseconds are appended. Default is %H:%M:%S.",
+ parse_tod_format),

OPT_END()
};
@@ -1071,6 +1150,9 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)

perf_session__delete(session);
cleanup_scripting();
+
+ if (tod_fmt != default_tod_fmt)
+ free(tod_fmt);
out:
return err;
}
--
1.7.4


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