af_unix: speedup /proc/net/unix

/proc/net/unix has quadratic behavior, and can hold unix_table_lock for
a while if high number of unix sockets are alive. (90 ms for 200k
sockets...)

We already have a hash table, so its quite easy to use it.

Problem is unbound sockets are still hashed in a single hash slot
(unix_socket_table[UNIX_HASH_TABLE])

This patch also spreads unbound sockets to 256 hash slots, to speedup
both /proc/net/unix and unix_diag.

Time to read /proc/net/unix with 200k unix sockets :
(time dd if=/proc/net/unix of=/dev/null bs=4k)

before : 520 secs
after : 2 secs

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 68 insertions, 48 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 641f2e47f165..cf83f6b5ac91 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -115,15 +115,24 @@
 #include <net/checksum.h>
 #include <linux/security.h>
 
-struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
+struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
 EXPORT_SYMBOL_GPL(unix_socket_table);
 DEFINE_SPINLOCK(unix_table_lock);
 EXPORT_SYMBOL_GPL(unix_table_lock);
 static atomic_long_t unix_nr_socks;
 
-#define unix_sockets_unbound    (&unix_socket_table[UNIX_HASH_SIZE])
 
-#define UNIX_ABSTRACT(sk)       (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE)
+static struct hlist_head *unix_sockets_unbound(void *addr)
+{
+        unsigned long hash = (unsigned long)addr;
+
+        hash ^= hash >> 16;
+        hash ^= hash >> 8;
+        hash %= UNIX_HASH_SIZE;
+        return &unix_socket_table[UNIX_HASH_SIZE + hash];
+}
+
+#define UNIX_ABSTRACT(sk)       (unix_sk(sk)->addr->hash < UNIX_HASH_SIZE)
 
 #ifdef CONFIG_SECURITY_NETWORK
 static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
@@ -645,7 +654,7 @@ static struct sock *unix_create1(struct net *net, struct socket *sock)
         INIT_LIST_HEAD(&u->link);
         mutex_init(&u->readlock); /* single task reading lock */
         init_waitqueue_head(&u->peer_wait);
-        unix_insert_socket(unix_sockets_unbound, sk);
+        unix_insert_socket(unix_sockets_unbound(sk), sk);
 out:
         if (sk == NULL)
                 atomic_long_dec(&unix_nr_socks);
@@ -2239,47 +2248,58 @@ static unsigned int unix_dgram_poll(struct file *file, struct socket *sock,
 }
 
 #ifdef CONFIG_PROC_FS
-static struct sock *first_unix_socket(int *i)
-{
-        for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
-                if (!hlist_empty(&unix_socket_table[*i]))
-                        return __sk_head(&unix_socket_table[*i]);
-        }
-        return NULL;
-}
 
-static struct sock *next_unix_socket(int *i, struct sock *s)
-{
-        struct sock *next = sk_next(s);
-        /* More in this chain? */
-        if (next)
-                return next;
-        /* Look for next non-empty chain. */
-        for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
-                if (!hlist_empty(&unix_socket_table[*i]))
-                        return __sk_head(&unix_socket_table[*i]);
-        }
-        return NULL;
-}
+#define BUCKET_SPACE (BITS_PER_LONG - (UNIX_HASH_BITS + 1) - 1)
+
+#define get_bucket(x) ((x) >> BUCKET_SPACE)
+#define get_offset(x) ((x) & ((1L << BUCKET_SPACE) - 1))
+#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
 
 struct unix_iter_state {
         struct seq_net_private p;
-        int i;
 };
 
-static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos)
+static struct sock *unix_from_bucket(struct seq_file *seq, loff_t *pos)
 {
-        struct unix_iter_state *iter = seq->private;
-        loff_t off = 0;
-        struct sock *s;
+        unsigned long offset = get_offset(*pos);
+        unsigned long bucket = get_bucket(*pos);
+        struct sock *sk;
+        unsigned long count = 0;
 
-        for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) {
-                if (sock_net(s) != seq_file_net(seq))
+        for (sk = sk_head(&unix_socket_table[bucket]); sk; sk = sk_next(sk)) {
+                if (sock_net(sk) != seq_file_net(seq))
                         continue;
-                if (off == pos)
-                        return s;
-                ++off;
+                if (++count == offset)
+                        break;
         }
+
+        return sk;
+}
+
+static struct sock *unix_next_socket(struct seq_file *seq,
+                                     struct sock *sk,
+                                     loff_t *pos)
+{
+        unsigned long bucket;
+
+        while (sk > (struct sock *)SEQ_START_TOKEN) {
+                sk = sk_next(sk);
+                if (!sk)
+                        goto next_bucket;
+                if (sock_net(sk) == seq_file_net(seq))
+                        return sk;
+        }
+
+        do {
+                sk = unix_from_bucket(seq, pos);
+                if (sk)
+                        return sk;
+
+next_bucket:
+                bucket = get_bucket(*pos) + 1;
+                *pos = set_bucket_offset(bucket, 1);
+        } while (bucket < ARRAY_SIZE(unix_socket_table));
+
         return NULL;
 }
 
@@ -2287,22 +2307,20 @@ static void *unix_seq_start(struct seq_file *seq, loff_t *pos)
         __acquires(unix_table_lock)
 {
         spin_lock(&unix_table_lock);
-        return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+
+        if (!*pos)
+                return SEQ_START_TOKEN;
+
+        if (get_bucket(*pos) >= ARRAY_SIZE(unix_socket_table))
+                return NULL;
+
+        return unix_next_socket(seq, NULL, pos);
 }
 
 static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 {
-        struct unix_iter_state *iter = seq->private;
-        struct sock *sk = v;
         ++*pos;
-
-        if (v == SEQ_START_TOKEN)
-                sk = first_unix_socket(&iter->i);
-        else
-                sk = next_unix_socket(&iter->i, sk);
-        while (sk && (sock_net(sk) != seq_file_net(seq)))
-                sk = next_unix_socket(&iter->i, sk);
-        return sk;
+        return unix_next_socket(seq, v, pos);
 }
 
 static void unix_seq_stop(struct seq_file *seq, void *v)
diff --git a/net/unix/diag.c b/net/unix/diag.c
index 47d3002737f5..7e8a24bff34a 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -195,7 +195,9 @@ static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
         num = s_num = cb->args[1];
 
         spin_lock(&unix_table_lock);
-        for (slot = s_slot; slot <= UNIX_HASH_SIZE; s_num = 0, slot++) {
+        for (slot = s_slot;
+             slot < ARRAY_SIZE(unix_socket_table);
+             s_num = 0, slot++) {
                 struct sock *sk;
                 struct hlist_node *node;
 
@@ -228,7 +230,7 @@ static struct sock *unix_lookup_by_ino(int ino)
         struct sock *sk;
 
         spin_lock(&unix_table_lock);
-        for (i = 0; i <= UNIX_HASH_SIZE; i++) {
+        for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
                 struct hlist_node *node;
 
                 sk_for_each(sk, node, &unix_socket_table[i])