linux-kernel - [PATCH V2 10/13] perf tools: add time related functions

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Date:   Fri,  2 Dec 2016 16:19:18 -0500
From:   kan.liang@...el.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     alexander.shishkin@...ux.intel.com, tglx@...utronix.de,
        namhyung@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
        wangnan0@...wei.com, mark.rutland@....com, andi@...stfloor.org,
        Kan Liang <kan.liang@...el.com>
Subject: [PATCH V2 10/13] perf tools: add time related functions

From: Kan Liang <kan.liang@...el.com>

Make get_nsecs visible to collect monotonic wall time.
Introduce get_vnsecs to collect CPU time.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 tools/perf/builtin-record.c | 9 +++++++++
 tools/perf/builtin-sched.c  | 2 +-
 tools/perf/builtin.h        | 2 ++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 73b033b..e69099d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -65,6 +65,15 @@ struct record {
 	unsigned long long	samples;
 };
 
+u64 get_vnsecs(void)
+{
+	struct timespec ts;
+
+	clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
+
+	return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
+}
+
 static int record__write(struct record *rec, void *bf, size_t size)
 {
 	if (perf_data_file__write(rec->session->file, bf, size) < 0) {
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index a49a032..35a301b 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -229,7 +229,7 @@ static struct thread **idle_threads;
 static int idle_max_cpu;
 static char idle_comm[] = "<idle>";
 
-static u64 get_nsecs(void)
+u64 get_nsecs(void)
 {
 	struct timespec ts;
 
diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
index 0bcf68e..2a9a1db 100644
--- a/tools/perf/builtin.h
+++ b/tools/perf/builtin.h
@@ -12,6 +12,8 @@ const char *help_unknown_cmd(const char *cmd);
 void prune_packed_objects(int);
 int read_line_with_nul(char *buf, int size, FILE *file);
 int check_pager_config(const char *cmd);
+u64 get_nsecs(void);
+u64 get_vnsecs(void);
 
 int cmd_annotate(int argc, const char **argv, const char *prefix);
 int cmd_bench(int argc, const char **argv, const char *prefix);
-- 
2.5.5