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replay: notify the main loop when there are no instructions

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When QEMU is executed in console mode without any external event sources,
main loop may sleep for a very long time. But in case of replay
there is another event source - event log.
This patch adds main loop notification when the vCPU loop has nothing
to do and main loop should process the inputs from the event log.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <159013007895.28110.2020104406699709721.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2020-05-22 09:47:58 +03:00 committed by Paolo Bonzini
parent 5d971f9e67
commit 255ae6e215
1 changed files with 12 additions and 3 deletions
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15
cpus.c
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@ -1374,6 +1374,13 @@ static int64_t tcg_get_icount_limit(void)
}
}
static void notify_aio_contexts(void)
{
/* Wake up other AioContexts. */
qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
}
static void handle_icount_deadline(void)
{
assert(qemu_in_vcpu_thread());
@ -1382,9 +1389,7 @@ static void handle_icount_deadline(void)
QEMU_TIMER_ATTR_ALL);
if (deadline == 0) {
/* Wake up other AioContexts. */
qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
notify_aio_contexts();
}
}
}
@ -1407,6 +1412,10 @@ static void prepare_icount_for_run(CPUState *cpu)
cpu->icount_extra = cpu->icount_budget - insns_left;
replay_mutex_lock();
if (cpu->icount_budget == 0 && replay_has_checkpoint()) {
notify_aio_contexts();
}
}
}