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replay: checkpoints

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This patch introduces checkpoints that synchronize cpu thread and iothread.
When checkpoint is met in the code all asynchronous events from the queue
are executed.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162444.8676.52916.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2015-09-17 19:24:44 +03:00 • committed by Paolo Bonzini
parent efab87cf79
commit 8bd7f71d79
7 changed files with 134 additions and 12 deletions
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41
qemu-timer.c
View file

@ -25,6 +25,7 @@
#include "qemu/main-loop.h"
#include "qemu/timer.h"
#include "sysemu/replay.h"
#include "sysemu/sysemu.h"
#ifdef CONFIG_POSIX
#include <pthread.h>
@ -478,10 +479,31 @@ bool timerlist_run_timers(QEMUTimerList *timer_list)
void *opaque;
qemu_event_reset(&timer_list->timers_done_ev);
if (!timer_list->clock->enabled) {
if (!timer_list->clock->enabled || !timer_list->active_timers) {
goto out;
}
switch (timer_list->clock->type) {
case QEMU_CLOCK_REALTIME:
break;
default:
case QEMU_CLOCK_VIRTUAL:
if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL)) {
goto out;
}
break;
case QEMU_CLOCK_HOST:
if (!replay_checkpoint(CHECKPOINT_CLOCK_HOST)) {
goto out;
}
break;
case QEMU_CLOCK_VIRTUAL_RT:
if (!replay_checkpoint(CHECKPOINT_CLOCK_VIRTUAL_RT)) {
goto out;
}
break;
}
current_time = qemu_clock_get_ns(timer_list->clock->type);
for(;;) {
qemu_mutex_lock(&timer_list->active_timers_lock);
@ -545,11 +567,17 @@ int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg)
{
int64_t deadline = -1;
QEMUClockType type;
bool play = replay_mode == REPLAY_MODE_PLAY;
for (type = 0; type < QEMU_CLOCK_MAX; type++) {
if (qemu_clock_use_for_deadline(tlg->tl[type]->clock->type)) {
deadline = qemu_soonest_timeout(deadline,
timerlist_deadline_ns(
tlg->tl[type]));
if (qemu_clock_use_for_deadline(type)) {
if (!play || type == QEMU_CLOCK_REALTIME) {
deadline = qemu_soonest_timeout(deadline,
timerlist_deadline_ns(tlg->tl[type]));
} else {
/* Read clock from the replay file and
do not calculate the deadline, based on virtual clock. */
qemu_clock_get_ns(type);
}
}
}
return deadline;
@ -574,8 +602,7 @@ int64_t qemu_clock_get_ns(QEMUClockType type)
now = REPLAY_CLOCK(REPLAY_CLOCK_HOST, get_clock_realtime());
last = clock->last;
clock->last = now;
if ((now < last || now > (last + get_max_clock_jump()))
&& replay_mode == REPLAY_MODE_NONE) {
if (now < last || now > (last + get_max_clock_jump())) {
notifier_list_notify(&clock->reset_notifiers, &now);
}
return now;