1 files changed, 27 insertions, 6 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 9bcdec3ad772..37755ccc0e96 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1876,6 +1876,20 @@ void tcp_shutdown(struct sock *sk, int how)
 }
 EXPORT_SYMBOL(tcp_shutdown);
 
+bool tcp_check_oom(struct sock *sk, int shift)
+{
+        bool too_many_orphans, out_of_socket_memory;
+
+        too_many_orphans = tcp_too_many_orphans(sk, shift);
+        out_of_socket_memory = tcp_out_of_memory(sk);
+
+        if (too_many_orphans && net_ratelimit())
+                pr_info("TCP: too many orphaned sockets\n");
+        if (out_of_socket_memory && net_ratelimit())
+                pr_info("TCP: out of memory -- consider tuning tcp_mem\n");
+        return too_many_orphans || out_of_socket_memory;
+}
+
 void tcp_close(struct sock *sk, long timeout)
 {
         struct sk_buff *skb;
@@ -2015,10 +2029,7 @@ adjudge_to_death:
         }
         if (sk->sk_state != TCP_CLOSE) {
                 sk_mem_reclaim(sk);
-                if (tcp_too_many_orphans(sk, 0)) {
-                        if (net_ratelimit())
-                                printk(KERN_INFO "TCP: too many of orphaned "
-                                       "sockets\n");
+                if (tcp_check_oom(sk, 0)) {
                         tcp_set_state(sk, TCP_CLOSE);
                         tcp_send_active_reset(sk, GFP_ATOMIC);
                         NET_INC_STATS_BH(sock_net(sk),
@@ -3216,6 +3227,15 @@ static int __init set_thash_entries(char *str)
 }
 __setup("thash_entries=", set_thash_entries);
 
+void tcp_init_mem(struct net *net)
+{
+        unsigned long limit = nr_free_buffer_pages() / 8;
+        limit = max(limit, 128UL);
+        net->ipv4.sysctl_tcp_mem[0] = limit / 4 * 3;
+        net->ipv4.sysctl_tcp_mem[1] = limit;
+        net->ipv4.sysctl_tcp_mem[2] = net->ipv4.sysctl_tcp_mem[0] * 2;
+}
+
 void __init tcp_init(void)
 {
         struct sk_buff *skb = NULL;
@@ -3276,9 +3296,10 @@ void __init tcp_init(void)
         sysctl_tcp_max_orphans = cnt / 2;
         sysctl_max_syn_backlog = max(128, cnt / 256);
 
+        tcp_init_mem(&init_net);
         /* Set per-socket limits to no more than 1/128 the pressure threshold */
-        limit = ((unsigned long)init_net.ipv4.sysctl_tcp_mem[1])
-                << (PAGE_SHIFT - 7);
+        limit = nr_free_buffer_pages() << (PAGE_SHIFT - 10);
+        limit = max(limit, 128UL);
         max_share = min(4UL*1024*1024, limit);
 
         sysctl_tcp_wmem[0] = SK_MEM_QUANTUM;