Re: [PATCH v2 1/4] migration: check for rate_limit_max for RATE_LIMIT_DISABLED

[Juan Quintela <quintela@redhat.com>]

Elena Ufimtseva <elena.ufimtseva@oracle.com> wrote:
> In migration rate limiting atomic operations are used
> to read the rate limit variables and transferred bytes and
> they are expensive. Check first if rate_limit_max is equal
> to RATE_LIMIT_DISABLED and return false immediately if so.
>
> Note that with this patch we will also will stop flushing
> by not calling qemu_fflush() from migration_transferred_bytes()
> if the migration rate is not exceeded.
> This should be fine since migration thread calls in the loop
> migration_update_counters from migration_rate_limit() that
> calls the migration_transferred_bytes() and flushes there.
>
> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
> Reviewed-by: Fabiano Rosas <farosas@suse.de>
> Reviewed-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Juan Quintela <quintela@redhat.com>

queued.