Re: [PATCH v7 10/12] multifd: Support for zero pages transmission

[Juan Quintela]

Leonardo Brás <leobras@redhat.com> wrote:

...

>> @@ -712,6 +726,7 @@ static void *multifd_send_thread(void *opaque)
>>              qemu_mutex_lock(&p->mutex);
>>              p->num_packets++;
>>              p->total_normal_pages += p->normal_num;
>> +            p->total_zero_pages += p->zero_num;
>
> I can see it getting declared, incremented and used. But where is it 
> initialized
> in zero? I mean, should it not have 'p->total_normal_pages = 0;' somewhere in
> setup?

int multifd_save_setup(Error **errp)
{
    ....

    thread_count = migrate_multifd_channels();
    multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
    multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);

You can see here, that we setup everything to zero.  We only need to
initialize explicitely whatever is not zero.


> (I understand multifd_save_setup() allocates a multifd_send_state->params with
> g_new0(),but other variables are zeroed there, like p->pending_job and 
> p->write_flags, so why not?)   

Humm, I think that it is better to do it the other way around.  Remove
the initilazations that are not zero.  That way we only put whatever is
not zero.


Thanks, Juan.