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[Qemu-devel] Patch: cpu-all.h for better cycle counter
From: |
Todd T. Fries |
Subject: |
[Qemu-devel] Patch: cpu-all.h for better cycle counter |
Date: |
Tue, 20 Mar 2007 21:37:28 -0500 |
User-agent: |
Mutt/1.5.12-2006-07-14 |
This is relative to the 20070319 snapshot.
--- cpu-all.h.orig Fri Mar 16 18:58:11 2007
+++ cpu-all.h Tue Mar 20 21:14:10 2007
@@ -1012,13 +1012,22 @@ static inline int64_t cpu_get_real_ticks
#endif
}
#else
-/* The host CPU doesn't have an easily accessible cycle counter.
- Just return a monotonically increasing vlue. This will be totally wrong,
- but hopefully better than nothing. */
+# warning non-optimized CPU
+#include <sys/time.h>
+#include <time.h>
+
static inline int64_t cpu_get_real_ticks (void)
{
- static int64_t ticks = 0;
- return ticks++;
+ struct timeval tv;
+ static int64_t i = 0;
+ int64_t j;
+
+ gettimeofday(&tv, NULL);
+ do {
+ j = (tv.tv_sec * (uint64_t) 1000000) + tv.tv_usec;
+ } while (i == j);
+ i = j;
+ return j;
}
#endif
--
Todd Fries .. address@hidden
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- [Qemu-devel] Patch: cpu-all.h for better cycle counter,
Todd T. Fries <=