From: Yoshihiro YUNOMAE <yoshihiro.yunomae...@hitachi.com>
Show raw time stamp values for stats per cpu if you choose counter or tsc mode
for trace_clock. Although a unit of tracing time stamp is nsec in local or
global mode,
the units in counter and TSC mode are tracing counter and cycles respectively.
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae...@hitachi.com>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@redhat.com>
Signed-off-by: David Sharp <dhsh...@google.com>
---
kernel/trace/trace.c | 23 +++++++++++++++++------
1 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index cff3427..8bfa3b7 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4396,13 +4396,24 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
cnt = ring_buffer_bytes_cpu(tr->buffer, cpu);
trace_seq_printf(s, "bytes: %ld\n", cnt);
- t = ns2usecs(ring_buffer_oldest_event_ts(tr->buffer, cpu));
- usec_rem = do_div(t, USEC_PER_SEC);
- trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", t, usec_rem);
+ if (trace_clocks[trace_clock_id].in_ns) {
+ /* local or global for trace_clock */
+ t = ns2usecs(ring_buffer_oldest_event_ts(tr->buffer, cpu));
+ usec_rem = do_div(t, USEC_PER_SEC);
+ trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n",
+ t, usec_rem);
+
+ t = ns2usecs(ring_buffer_time_stamp(tr->buffer, cpu));
+ usec_rem = do_div(t, USEC_PER_SEC);
+ trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
+ } else {
+ /* counter or tsc mode for trace_clock */
+ trace_seq_printf(s, "oldest event ts: %llu\n",
+ ring_buffer_oldest_event_ts(tr->buffer, cpu));
- t = ns2usecs(ring_buffer_time_stamp(tr->buffer, cpu));
- usec_rem = do_div(t, USEC_PER_SEC);
- trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem);
+ trace_seq_printf(s, "now ts: %llu\n",
+ ring_buffer_time_stamp(tr->buffer, cpu));
+ }
count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
--
1.7.7.3
--
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