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authorPavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>2014-11-26 13:40:55 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2014-12-15 12:21:02 +0100
commitbf2a7ddb0a066c27ed1432b918baa046b6b7dfc5 (patch)
tree23d6d457af0f598306de563a06f88b9c2c5e85d5 /cpus.c
parent4e7fa73ec2516334b58e82f9a5649b1468b1eb7a (diff)
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cpus: make icount warp behave well with respect to stop/cont
This patch makes icount warp use the new QEMU_CLOCK_VIRTUAL_RT clock. This way, icount's QEMU_CLOCK_VIRTUAL will never count time during which the virtual machine is stopped. Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'cpus.c')
-rw-r--r--cpus.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/cpus.c b/cpus.c
index 5f8acba..1b5168a 100644
--- a/cpus.c
+++ b/cpus.c
@@ -352,7 +352,7 @@ static void icount_warp_rt(void *opaque)
seqlock_write_lock(&timers_state.vm_clock_seqlock);
if (runstate_is_running()) {
- int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+ int64_t clock = cpu_get_clock_locked();
int64_t warp_delta;
warp_delta = clock - vm_clock_warp_start;
@@ -361,9 +361,8 @@ static void icount_warp_rt(void *opaque)
* In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too
* far ahead of real time.
*/
- int64_t cur_time = cpu_get_clock_locked();
int64_t cur_icount = cpu_get_icount_locked();
- int64_t delta = cur_time - cur_icount;
+ int64_t delta = clock - cur_icount;
warp_delta = MIN(warp_delta, delta);
}
timers_state.qemu_icount_bias += warp_delta;
@@ -426,7 +425,7 @@ void qemu_clock_warp(QEMUClockType type)
}
/* We want to use the earliest deadline from ALL vm_clocks */
- clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+ clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT);
deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
if (deadline < 0) {
return;
@@ -444,8 +443,8 @@ void qemu_clock_warp(QEMUClockType type)
* sleep in icount mode if there is a pending QEMU_CLOCK_VIRTUAL
* timer; rather time could just advance to the next QEMU_CLOCK_VIRTUAL
* event. Instead, we do stop VCPUs and only advance QEMU_CLOCK_VIRTUAL
- * after some e"real" time, (related to the time left until the next
- * event) has passed. The QEMU_CLOCK_REALTIME timer will do this.
+ * after some "real" time, (related to the time left until the next
+ * event) has passed. The QEMU_CLOCK_VIRTUAL_RT clock will do this.
* This avoids that the warps are visible externally; for example,
* you will not be sending network packets continuously instead of
* every 100ms.
@@ -519,8 +518,8 @@ void configure_icount(QemuOpts *opts, Error **errp)
return;
}
icount_align_option = qemu_opt_get_bool(opts, "align", false);
- icount_warp_timer = timer_new_ns(QEMU_CLOCK_REALTIME,
- icount_warp_rt, NULL);
+ icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
+ icount_warp_rt, NULL);
if (strcmp(option, "auto") != 0) {
errno = 0;
icount_time_shift = strtol(option, &rem_str, 0);
@@ -544,10 +543,10 @@ void configure_icount(QemuOpts *opts, Error **errp)
the virtual time trigger catches emulated time passing too fast.
Realtime triggers occur even when idle, so use them less frequently
than VM triggers. */
- icount_rt_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
- icount_adjust_rt, NULL);
+ icount_rt_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL_RT,
+ icount_adjust_rt, NULL);
timer_mod(icount_rt_timer,
- qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
+ qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000);
icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
icount_adjust_vm, NULL);
timer_mod(icount_vm_timer,