net: implement per-cpu reserves for memory_allocated
We plan keeping sk->sk_forward_alloc as small as possible in future patches. This means we are going to call sk_memory_allocated_add() and sk_memory_allocated_sub() more often. Implement a per-cpu cache of +1/-1 MB, to reduce number of changes to sk->sk_prot->memory_allocated, which would otherwise be cause of false sharing. Signed-off-by:Eric Dumazet <edumazet@google.com> Acked-by:
Soheil Hassas Yeganeh <soheil@google.com> Reviewed-by:
Shakeel Butt <shakeelb@google.com> Signed-off-by:
Jakub Kicinski <kuba@kernel.org>
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