Commit 1338d466 authored by Committed by David S. MillerBrowse files
[SOCK]: Introduce a percpu inuse counters array (v2).
And redirect sock_prot_inuse_add and _get to use one. As far as the dereferences are concerned. Before the patch we made 1 dereference to proto->inuse.add call, the call itself and then called the __get_cpu_var() on a static variable. After the patch we make a direct call, then one dereference to proto->inuse_idx and then the same __get_cpu_var() on a still static variable. So this patch doesn't seem to produce performance penalty on SMP. This is not per-net yet, but I will deliberately make NET_NS=y case separated from NET_NS=n one, since it'll cost us one-or-two more dereferences to get the struct net and the inuse counter. Signed-off-by: Pavel Emelyanov <firstname.lastname@example.org> Acked-by: Eric Dumazet <email@example.com> Signed-off-by: David S. Miller <firstname.lastname@example.org>