( last(mysql.innodb_buffer_pool_pages_total) - 
last(mysql.innodb_buffer_pool_pages_free) ) / 
( last(mysql.innodb_buffer_pool_pages_total) + 
( last(mysql.innodb_buffer_pool_pages_total) = 0 ) ) * 100 *
( last(mysql.innodb_buffer_pool_pages_total) > 0 )