getdelays: show average CPU/IO/SWAP/RECLAIM delays

I find it very handy to show the average delays in milliseconds.

Example output (on 100 concurrent dd reading sparse files):

CPU count real total virtual total delay total delay average
986 3223509952 3207643301 38863410579 39.415ms
IO count delay total delay average
0 0 0ms
SWAP count delay total delay average
0 0 0ms
RECLAIM count delay total delay average
1059 5131834899 4ms
dd: read=0, write=0, cancelled_write=0

Signed-off-by: Wu Fengguang <[e-mail]>
Cc: Mel Gorman <[e-mail]>
Cc: Balbir Singh <[e-mail]>
Reviewed-by: Satoru Moriya <[e-mail]>
Reviewed-by: KOSAKI Motohiro <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

Documentation/accounting/getdelays.c

···
 	return id;
 }
 
+#define average_ms(t, c) (t / 1000000ULL / (c ? c : 1))
+
 static void print_delayacct(struct taskstats *t)
 {
-	printf("\n\nCPU   %15s%15s%15s%15s\n"
-	       "      %15llu%15llu%15llu%15llu\n"
-	       "IO    %15s%15s\n"
-	       "      %15llu%15llu\n"
-	       "SWAP  %15s%15s\n"
-	       "      %15llu%15llu\n"
-	       "RECLAIM  %12s%15s\n"
-	       "      %15llu%15llu\n",
-	       "count", "real total", "virtual total", "delay total",
+	printf("\n\nCPU   %15s%15s%15s%15s%15s\n"
+	       "      %15llu%15llu%15llu%15llu%15.3fms\n"
+	       "IO    %15s%15s%15s\n"
+	       "      %15llu%15llu%15llums\n"
+	       "SWAP  %15s%15s%15s\n"
+	       "      %15llu%15llu%15llums\n"
+	       "RECLAIM  %12s%15s%15s\n"
+	       "      %15llu%15llu%15llums\n",
+	       "count", "real total", "virtual total",
+	       "delay total", "delay average",
 	       (unsigned long long)t->cpu_count,
 	       (unsigned long long)t->cpu_run_real_total,
 	       (unsigned long long)t->cpu_run_virtual_total,
 	       (unsigned long long)t->cpu_delay_total,
-	       "count", "delay total",
+	       average_ms((double)t->cpu_delay_total, t->cpu_count),
+	       "count", "delay total", "delay average",
 	       (unsigned long long)t->blkio_count,
 	       (unsigned long long)t->blkio_delay_total,
-	       "count", "delay total",
+	       average_ms(t->blkio_delay_total, t->blkio_count),
+	       "count", "delay total", "delay average",
 	       (unsigned long long)t->swapin_count,
 	       (unsigned long long)t->swapin_delay_total,
-	       "count", "delay total",
+	       average_ms(t->swapin_delay_total, t->swapin_count),
+	       "count", "delay total", "delay average",
 	       (unsigned long long)t->freepages_count,
-	       (unsigned long long)t->freepages_delay_total);
+	       (unsigned long long)t->freepages_delay_total,
+	       average_ms(t->freepages_delay_total, t->freepages_count));
 }
 
 static void task_context_switch_counts(struct taskstats *t)