[Qemu-devel] [PATCH 1/4] do not use qemu_icount_delta in the !use_icount case

[Paolo Bonzini <pbonzini@redhat.com>]

The !use_icount code is the same for iothread and non-iothread,
except that the timeout is different.  Since the timeout might as
well be infinite and is only masking bugs, use the higher value.
With this change the !use_icount code is handled equivalently
in qemu_icount_delta and qemu_calculate_timeout, and we rip it
out of the former.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 qemu-timer.c |   59 ++++++++++++++++++++++++---------------------------------
 1 files changed, 25 insertions(+), 34 deletions(-)

diff --git a/qemu-timer.c b/qemu-timer.c
index b0db780..88c7b28 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -112,9 +112,7 @@ static int64_t cpu_get_clock(void)
 
 static int64_t qemu_icount_delta(void)
 {
-    if (!use_icount) {
-        return 5000 * (int64_t) 1000000;
-    } else if (use_icount == 1) {
+    if (use_icount == 1) {
         /* When not using an adaptive execution frequency
            we tend to get badly out of sync with real time,
            so just delay for a reasonable amount of time.  */
@@ -1077,43 +1075,36 @@ void quit_timers(void)
 int qemu_calculate_timeout(void)
 {
     int timeout;
+    int64_t add;
+    int64_t delta;
 
-#ifdef CONFIG_IOTHREAD
     /* When using icount, making forward progress with qemu_icount when the
        guest CPU is idle is critical. We only use the static io-thread timeout
        for non icount runs.  */
-    if (!use_icount) {
-        return 1000;
+    if (!use_icount || !vm_running) {
+        return 5000;
     }
-#endif
 
-    if (!vm_running)
-        timeout = 5000;
-    else {
-     /* XXX: use timeout computed from timers */
-        int64_t add;
-        int64_t delta;
-        /* Advance virtual time to the next event.  */
-	delta = qemu_icount_delta();
-        if (delta > 0) {
-            /* If virtual time is ahead of real time then just
-               wait for IO.  */
-            timeout = (delta + 999999) / 1000000;
-        } else {
-            /* Wait for either IO to occur or the next
-               timer event.  */
-            add = qemu_next_deadline();
-            /* We advance the timer before checking for IO.
-               Limit the amount we advance so that early IO
-               activity won't get the guest too far ahead.  */
-            if (add > 10000000)
-                add = 10000000;
-            delta += add;
-            qemu_icount += qemu_icount_round (add);
-            timeout = delta / 1000000;
-            if (timeout < 0)
-                timeout = 0;
-        }
+    /* Advance virtual time to the next event.  */
+    delta = qemu_icount_delta();
+    if (delta > 0) {
+        /* If virtual time is ahead of real time then just
+           wait for IO.  */
+        timeout = (delta + 999999) / 1000000;
+    } else {
+        /* Wait for either IO to occur or the next
+           timer event.  */
+        add = qemu_next_deadline();
+        /* We advance the timer before checking for IO.
+           Limit the amount we advance so that early IO
+           activity won't get the guest too far ahead.  */
+        if (add > 10000000)
+            add = 10000000;
+        delta += add;
+        qemu_icount += qemu_icount_round (add);
+        timeout = delta / 1000000;
+        if (timeout < 0)
+            timeout = 0;
     }
 
     return timeout;
-- 
1.7.3.5