inetpeer: reduce stack usage

BugLink: http://bugs.launchpad.net/bugs/793702

[ Upstream commit 66944e1c5797562cebe2d1857d46dff60bf9a69e ]

On 64bit arches, we use 752 bytes of stack when cleanup_once() is called
from inet_getpeer().

Lets share the avl stack to save ~376 bytes.

Before patch :

# objdump -d net/ipv4/inetpeer.o | scripts/checkstack.pl

0x000006c3 unlink_from_pool [inetpeer.o]:		376
0x00000721 unlink_from_pool [inetpeer.o]:		376
0x00000cb1 inet_getpeer [inetpeer.o]:			376
0x00000e6d inet_getpeer [inetpeer.o]:			376
0x0004 inet_initpeers [inetpeer.o]:			112
# size net/ipv4/inetpeer.o
   text	   data	    bss	    dec	    hex	filename
   5320	    432	     21	   5773	   168d	net/ipv4/inetpeer.o

After patch :

objdump -d net/ipv4/inetpeer.o | scripts/checkstack.pl
0x00000c11 inet_getpeer [inetpeer.o]:			376
0x00000dcd inet_getpeer [inetpeer.o]:			376
0x00000ab9 peer_check_expire [inetpeer.o]:		328
0x00000b7f peer_check_expire [inetpeer.o]:		328
0x0004 inet_initpeers [inetpeer.o]:			112
# size net/ipv4/inetpeer.o
   text	   data	    bss	    dec	    hex	filename
   5163	    432	     21	   5616	   15f0	net/ipv4/inetpeer.o

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Scot Doyle <lkml@scotdoyle.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
Reviewed-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index a96e656..14af1b4 100644 (file)
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -366,7 +366,8 @@ static void inetpeer_free_rcu(struct rcu_head *head)
 }
 
 /* May be called with local BH enabled. */
-static void unlink_from_pool(struct inet_peer *p, struct inet_peer_base *base)
+static void unlink_from_pool(struct inet_peer *p, struct inet_peer_base *base,
+                            struct inet_peer __rcu **stack[PEER_MAXDEPTH])
 {
        int do_free;
 
@@ -380,7 +381,6 @@ static void unlink_from_pool(struct inet_peer *p, struct inet_peer_base *base)
         * We use refcnt=-1 to alert lockless readers this entry is deleted.
         */
        if (atomic_cmpxchg(&p->refcnt, 1, -1) == 1) {
-               struct inet_peer __rcu **stack[PEER_MAXDEPTH];
                struct inet_peer __rcu ***stackptr, ***delp;
                if (lookup(&p->daddr, stack, base) != p)
                        BUG();
@@ -435,7 +435,7 @@ static struct inet_peer_base *peer_to_base(struct inet_peer *p)
 }
 
 /* May be called with local BH enabled. */
-static int cleanup_once(unsigned long ttl)
+static int cleanup_once(unsigned long ttl, struct inet_peer __rcu **stack[PEER_MAXDEPTH])
 {
        struct inet_peer *p = NULL;
 
@@ -467,7 +467,7 @@ static int cleanup_once(unsigned long ttl)
                 * happen because of entry limits in route cache. */
                return -1;
 
-       unlink_from_pool(p, peer_to_base(p));
+       unlink_from_pool(p, peer_to_base(p), stack);
        return 0;
 }
 
@@ -523,7 +523,7 @@ struct inet_peer *inet_getpeer(struct inetpeer_addr *daddr, int create)
 
        if (base->total >= inet_peer_threshold)
                /* Remove one less-recently-used entry. */
-               cleanup_once(0);
+               cleanup_once(0, stack);
 
        return p;
 }
@@ -539,6 +539,7 @@ static void peer_check_expire(unsigned long dummy)
 {
        unsigned long now = jiffies;
        int ttl, total;
+       struct inet_peer __rcu **stack[PEER_MAXDEPTH];
 
        total = compute_total();
        if (total >= inet_peer_threshold)
@@ -547,7 +548,7 @@ static void peer_check_expire(unsigned long dummy)
                ttl = inet_peer_maxttl
                                - (inet_peer_maxttl - inet_peer_minttl) / HZ *
                                        total / inet_peer_threshold * HZ;
-       while (!cleanup_once(ttl)) {
+       while (!cleanup_once(ttl, stack)) {
                if (jiffies != now)
                        break;
        }