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| author | Pavel Emelyanov <xemul@openvz.org> | 2008-03-28 23:38:43 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-03-28 23:38:43 (GMT) |
| commit | 1338d466d9c3f8a65cc6d83c629cd906f2a989f8 (patch) | |
| tree | 2f30913c1c9c6d3c0616ac593e79b0431cc150d3 /include/net | |
| parent | 13ff3d6fa4e6d8b6ee7c64245a0078e6a0e6f977 (diff) | |
| download | linux-1338d466d9c3f8a65cc6d83c629cd906f2a989f8.tar.xz | |
[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 <xemul@openvz.org>
Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/sock.h | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/include/net/sock.h b/include/net/sock.h index abc6341..ebf9552 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -639,18 +639,15 @@ static inline void sk_refcnt_debug_release(const struct sock *sk) # define DEFINE_PROTO_INUSE(NAME) DEFINE_PCOUNTER(NAME) # define REF_PROTO_INUSE(NAME) PCOUNTER_MEMBER_INITIALIZER(NAME, .inuse) /* Called with local bh disabled */ -static inline void sock_prot_inuse_add(struct proto *prot, int inc) -{ - pcounter_add(&prot->inuse, inc); -} +extern void sock_prot_inuse_add(struct proto *prot, int inc); + static inline int sock_prot_inuse_init(struct proto *proto) { return pcounter_alloc(&proto->inuse); } -static inline int sock_prot_inuse_get(struct proto *proto) -{ - return pcounter_getval(&proto->inuse); -} + +extern int sock_prot_inuse_get(struct proto *proto); + static inline void sock_prot_inuse_free(struct proto *proto) { pcounter_free(&proto->inuse); |