page_pool: help compiler remove code in case CONFIG_NUMA=n
When kernel is compiled without NUMA support, then page_pool NUMA config setting (pool->p.nid) doesn't make any practical sense. The compiler cannot see that it can remove the code paths. This patch avoids reading pool->p.nid setting in case of !CONFIG_NUMA, in allocation and numa check code, which helps compiler to see the optimisation potential. It leaves update code intact to keep API the same. $ ./scripts/bloat-o-meter net/core/page_pool.o-numa-enabled \ net/core/page_pool.o-numa-disabled add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-113 (-113) Function old new delta page_pool_create 401 398 -3 __page_pool_alloc_pages_slow 439 426 -13 page_pool_refill_alloc_cache 425 328 -97 Total: Before=3611, After=3498, chg -3.13% Signed-off-by:Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
44768dec
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