1 files changed, 57 insertions, 6 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 20de3fa7ae40..5504fb9fa88a 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -560,6 +560,14 @@ struct proto {
         void                    (*unhash)(struct sock *sk);
         int                     (*get_port)(struct sock *sk, unsigned short snum);
 
+#ifdef CONFIG_SMP
+        /* Keeping track of sockets in use */
+        void                    (*inuse_add)(struct proto *prot, int inc);
+        int                     (*inuse_getval)(const struct proto *prot);
+        int                     *inuse_ptr;
+#else
+        int                     inuse;
+#endif
         /* Memory pressure */
         void                    (*enter_memory_pressure)(void);
         atomic_t                *memory_allocated;      /* Current allocated memory. */
@@ -592,12 +600,38 @@ struct proto {
 #ifdef SOCK_REFCNT_DEBUG
         atomic_t                socks;
 #endif
-        struct {
-                int inuse;
-                u8  __pad[SMP_CACHE_BYTES - sizeof(int)];
-        } stats[NR_CPUS];
 };
 
+/*
+ * Special macros to let protos use a fast version of inuse{get|add}
+ * using a static percpu variable per proto instead of an allocated one,
+ * saving one dereference.
+ * This might be changed if/when dynamic percpu vars become fast.
+ */
+#ifdef CONFIG_SMP
+# define DEFINE_PROTO_INUSE(NAME)                       \
+static DEFINE_PER_CPU(int, NAME##_inuse);               \
+static void NAME##_inuse_add(struct proto *prot, int inc)       \
+{                                                       \
+        __get_cpu_var(NAME##_inuse) += inc;             \
+}                                                       \
+                                                        \
+static int NAME##_inuse_getval(const struct proto *prot)\
+{                                                       \
+        int res = 0, cpu;                               \
+                                                        \
+        for_each_possible_cpu(cpu)                      \
+                res += per_cpu(NAME##_inuse, cpu);      \
+        return res;                                     \
+}
+# define REF_PROTO_INUSE(NAME)                          \
+        .inuse_add = NAME##_inuse_add,                  \
+        .inuse_getval = NAME##_inuse_getval,
+#else
+# define DEFINE_PROTO_INUSE(NAME)
+# define REF_PROTO_INUSE(NAME)
+#endif
+
 extern int proto_register(struct proto *prot, int alloc_slab);
 extern void proto_unregister(struct proto *prot);
 
@@ -629,12 +663,29 @@ static inline void sk_refcnt_debug_release(const struct sock *sk)
 /* Called with local bh disabled */
 static __inline__ void sock_prot_inc_use(struct proto *prot)
 {
-        prot->stats[smp_processor_id()].inuse++;
+#ifdef CONFIG_SMP
+        prot->inuse_add(prot, 1);
+#else
+        prot->inuse++;
+#endif
 }
 
 static __inline__ void sock_prot_dec_use(struct proto *prot)
 {
-        prot->stats[smp_processor_id()].inuse--;
+#ifdef CONFIG_SMP
+        prot->inuse_add(prot, -1);
+#else
+        prot->inuse--;
+#endif
+}
+
+static __inline__ int sock_prot_inuse(struct proto *proto)
+{
+#ifdef CONFIG_SMP
+        return proto->inuse_getval(proto);
+#else
+        return proto->inuse;
+#endif
 }
 
 /* With per-bucket locks this operation is not-atomic, so that