[PATCH 2/2] Determine the iteration count based on wallclock instead of user+system time.

[Wei-cheng Wang <cole945@gmail.com>]

Hi Ulrich,

This patch will combine with "Tracepoint for ppc64" into one patch.
Is this ok?

Thanks,
Wei-cheng

---

gdb/testsuite/ChangeLog

2015-08-23  Wei-cheng Wang  <cole945@gmail.com>

	* gdb.trace/tspeed.c (myclock): Return wallclock instead of
	user+system time.
	(trace_speed_test): Determine the iteration count for a time
	between 15..30 seconds.
---
 gdb/testsuite/gdb.trace/tspeed.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/gdb/testsuite/gdb.trace/tspeed.c b/gdb/testsuite/gdb.trace/tspeed.c
index ca4c7bf..c9e212c 100644
--- a/gdb/testsuite/gdb.trace/tspeed.c
+++ b/gdb/testsuite/gdb.trace/tspeed.c
@@ -56,13 +56,9 @@ int nspertp = 0;
 unsigned long long
 myclock ()
 {
-  struct timeval tm, tm2;
-  struct rusage ru;
-  getrusage (RUSAGE_SELF, &ru);
-  tm = ru.ru_utime;
-  tm2 = ru.ru_stime;
-  return (((unsigned long long) tm.tv_sec) * 1000000) + tm.tv_usec
-    + (((unsigned long long) tm2.tv_sec) * 1000000) + tm2.tv_usec;
+  struct timeval tm;
+  gettimeofday (&tm, NULL);
+  return (((unsigned long long) tm.tv_sec) * 1000000) + tm.tv_usec;
 }
 
 int
@@ -162,9 +158,9 @@ trace_speed_test (void)
     return -1;
 
   if (idelta > mindelta
-      /* Total test time should be between 2 and 5 seconds.  */
-      && (total1 + total2) > (2 * 1000000)
-      && (total1 + total2) < (5 * 1000000)) 
+      /* Total test time should be between 15 and 30 seconds.  */
+      && (total1 + total2) > (15 * 1000000)
+      && (total1 + total2) < (30 * 1000000))
     {
       nsdelta = (((unsigned long long) idelta) * 1000) / iters;
       printf ("Second loop took %d ns longer per iter than first\n", nsdelta);
-- 
1.9.1