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cpus: make icount warp behave well with respect to stop/cont

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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>
This commit is contained in:
Pavel Dovgalyuk 2014-11-26 13:40:55 +03:00 committed by Paolo Bonzini
parent 4e7fa73ec2
commit bf2a7ddb0a
2 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
cpus.c
View File

@ -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,

3
include/qemu/timer.h
View File

@ -41,7 +41,8 @@
*
* Outside icount mode, this clock is the same as @QEMU_CLOCK_VIRTUAL.
* In icount mode, this clock counts nanoseconds while the virtual
* machine is running.
* machine is running. It is used to increase @QEMU_CLOCK_VIRTUAL
* while the CPUs are sleeping and thus not executing instructions.
*/
typedef enum {