trace-cmd: Add max and min latencies for report with -w

Instead of just showing the average wakeup latency in the -w report,
also show the max and min latencies as well as the time stamp that
they occurred.

Requested-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 21 insertions, 1 deletions

diff --git a/trace-read.c b/trace-read.c
index 4aa8d75..dc79cf1 100644
--- a/trace-read.c
+++ b/trace-read.c
@@ -366,6 +366,11 @@ static void add_wakeup(unsigned int val, unsigned long long start)
         wakeup_hash[key] = info;
 }
 
+static unsigned long long max_lat = 0;
+static unsigned long long max_time;
+static unsigned long long min_lat = -1;
+static unsigned long long min_time;
+
 static void add_sched(unsigned int val, unsigned long long end)
 {
         unsigned int key = calc_wakeup_key(val);
@@ -379,6 +384,15 @@ static void add_sched(unsigned int val, unsigned long long end)
 
         cal = end - info->start;
 
+        if (cal > max_lat) {
+                max_lat = cal;
+                max_time = end;
+        }
+        if (cal < min_lat) {
+                min_lat = cal;
+                min_time = end;
+        }
+
         printf(" Latency: %llu.%03llu usecs", cal / 1000, cal % 1000);
 
         total_wakeup_lat += cal;
@@ -437,9 +451,15 @@ static void finish_wakeup(void)
 
         total_wakeup_lat /= wakeup_lat_count;
 
-        printf("\nAverage wakeup latency: %llu.%03llu usecs\n\n",
+        printf("\nAverage wakeup latency: %llu.%03llu usecs\n",
                total_wakeup_lat / 1000,
                total_wakeup_lat % 1000);
+        printf("Maximum Latency: %llu.%03llu usecs at ", max_lat / 1000, max_lat % 1000);
+        printf("timestamp: %llu.%06llu\n",
+               max_time / 1000000000, ((max_time + 500) % 1000000000) / 1000);
+        printf("Minimum Latency: %llu.%03llu usecs at ", min_lat / 1000, min_lat % 1000);
+        printf("timestamp: %llu.%06llu\n\n", min_time / 1000000000,
+               ((min_time + 500) % 1000000000) / 1000);
 
         for (i = 0; i < WAKEUP_HASH_SIZE; i++) {
                 while (wakeup_hash[i]) {