Adding php-fpm pools without having to fully stop/start php-fpm?

["Rose, John B" <jbrose@xxxxxxx>]

We would like to add a php-fpm pool when needed without having to fully stop/start php-fpm

Thus far, we are not seeing that is possible

Is it possible to gracefully restart php-fpm? 

What do others do when adding pools and not have to take down php-fpm services to existing sites?

Thanks