Re: [PATCH] replay: notify the main loop when there are no instructions

[Paolo Bonzini]

On 01/06/20 12:35, Pavel Dovgalyuk wrote:
> ping
> 
> On 22.05.2020 09:47, Pavel Dovgalyuk wrote:
>> 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>

It's a long weekend here today but I should get a QEMU pull request
submitted on Wednesday.

Paolo

>>   0 files changed
>>
>> diff --git a/cpus.c b/cpus.c
>> index 7ce0d569b3..b4d0d9f21b 100644
>> --- a/cpus.c
>> +++ b/cpus.c
>> @@ -1362,6 +1362,13 @@ 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());
>> @@ -1370,9 +1377,7 @@ 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();
>>           }
>>       }
>>   }
>> @@ -1395,6 +1400,10 @@ 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();
>> +        }
>>       }
>>   }
>>  
>