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Subject[PATCH 064/161] perf trace: Add option to show full timestamp
Date
From: David Ahern <dsahern@gmail.com>

Current timestamp shown for output is time relative to firt sample. This
patch adds an option to show the absolute perf_clock timestamp which is
useful when comparing output across commands (e.g., perf-trace to
perf-script).

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1378319865-55695-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/Documentation/perf-trace.txt | 4 ++++
tools/perf/builtin-trace.c | 7 +++++--
2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index daccd2c0a48f..a93e91aad583 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -78,6 +78,10 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
--input
Process events from a given perf data file.

+-T
+--time
+ Print full timestamp rather time relative to first sample.
+
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-script[1]
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 7ce036ee863b..bc21140ac782 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -624,6 +624,7 @@ struct trace {
struct perf_record_opts opts;
struct machine host;
u64 base_time;
+ bool full_time;
FILE *output;
unsigned long nr_events;
struct strlist *ev_qualifier;
@@ -1066,7 +1067,7 @@ static int trace__process_sample(struct perf_tool *tool,
if (skip_sample(trace, sample))
return 0;

- if (trace->base_time == 0)
+ if (!trace->full_time && trace->base_time == 0)
trace->base_time = sample->time;

if (handler)
@@ -1195,7 +1196,7 @@ again:
continue;
}

- if (trace->base_time == 0)
+ if (!trace->full_time && trace->base_time == 0)
trace->base_time = sample.time;

if (type != PERF_RECORD_SAMPLE) {
@@ -1433,6 +1434,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
trace__set_duration),
OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
+ OPT_BOOLEAN('T', "time", &trace.full_time,
+ "Show full timestamp, not time relative to first start"),
OPT_END()
};
int err;
--
1.8.1.4


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