Re: [PATCH 2/3] migration: Drop unnecessary check in ram's pending_exact()

[Fabiano Rosas <farosas@suse.de>]

peterx@redhat.com writes:

> From: Peter Xu <peterx@redhat.com>
>
> When the migration frameworks fetches the exact pending sizes, it means
> this check:
>
>   remaining_size < s->threshold_size
>
> Must have been done already, actually at migration_iteration_run():
>
>     if (must_precopy <= s->threshold_size) {
>         qemu_savevm_state_pending_exact(&must_precopy, &can_postcopy);
>
> That should be after one round of ram_state_pending_estimate().  It makes
> the 2nd check meaningless and can be dropped.
>
> To say it in another way, when reaching ->state_pending_exact(), we
> unconditionally sync dirty bits for precopy.
>
> Then we can drop migrate_get_current() there too.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Fabiano Rosas <farosas@suse.de>