tracing: Show raw time stamp on stats per cpu using counter or tsc mode for trace_clock

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.
Link: http://lkml.kernel.org/r/1352837903-32191-3-git-send-email-dhsharp@google.com
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@hitachi.com>
Signed-off-by: David Sharp <dhsharp@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d943e69569cdf7623adf5489f8d865145f14734c..b69cc380322dbfe17983e582a9537d6e53e1ce7b 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4388,13 +4388,24 @@ 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));
+       }
 
        cnt = ring_buffer_dropped_events_cpu(tr->buffer, cpu);
        trace_seq_printf(s, "dropped events: %ld\n", cnt);