aboutsummaryrefslogtreecommitdiff
path: root/net/core
diff options
context:
space:
mode:
authorPavel Emelyanov <xemul@openvz.org>2008-03-28 16:38:17 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-28 16:38:17 -0700
commit13ff3d6fa4e6d8b6ee7c64245a0078e6a0e6f977 (patch)
treec52580ac89aff1b4eabbd94e6cb73af15e91051f /net/core
parentbc578a54f0fd489d0722303f9a52508495ccaf9a (diff)
[SOCK]: Enumerate struct proto-s to facilitate percpu inuse accounting (v2).
The inuse counters are going to become a per-cpu array. Introduce an index for this array on the struct proto. To handle the case of proto register-unregister-register loop the bitmap is used. All its bits manipulations are protected with proto_list_lock and a sanity check for the bitmap being exhausted is also added. 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 'net/core')
-rw-r--r--net/core/sock.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 3ee95060dbd..7d2c8add5f5 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1940,6 +1940,38 @@ EXPORT_SYMBOL(sk_common_release);
static DEFINE_RWLOCK(proto_list_lock);
static LIST_HEAD(proto_list);
+#ifdef CONFIG_PROC_FS
+#define PROTO_INUSE_NR 64 /* should be enough for the first time */
+
+static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
+
+static void assign_proto_idx(struct proto *prot)
+{
+ prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
+
+ if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
+ printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
+ return;
+ }
+
+ set_bit(prot->inuse_idx, proto_inuse_idx);
+}
+
+static void release_proto_idx(struct proto *prot)
+{
+ if (prot->inuse_idx != PROTO_INUSE_NR - 1)
+ clear_bit(prot->inuse_idx, proto_inuse_idx);
+}
+#else
+static inline void assign_proto_idx(struct proto *prot)
+{
+}
+
+static inline void release_proto_idx(struct proto *prot)
+{
+}
+#endif
+
int proto_register(struct proto *prot, int alloc_slab)
{
char *request_sock_slab_name = NULL;
@@ -2000,6 +2032,7 @@ int proto_register(struct proto *prot, int alloc_slab)
write_lock(&proto_list_lock);
list_add(&prot->node, &proto_list);
+ assign_proto_idx(prot);
write_unlock(&proto_list_lock);
return 0;
@@ -2026,6 +2059,7 @@ EXPORT_SYMBOL(proto_register);
void proto_unregister(struct proto *prot)
{
write_lock(&proto_list_lock);
+ release_proto_idx(prot);
list_del(&prot->node);
write_unlock(&proto_list_lock);