[DST]: shrinks sizeof(struct rtable) by 64 bytes on x86_64

On x86_64, sizeof(struct rtable) is 0x148, which is rounded up to
0x180 bytes by SLAB allocator.

We can reduce this to exactly 0x140 bytes, without alignment overhead,
and store 12 struct rtable per PAGE instead of 10.

rate_tokens is currently defined as an "unsigned long", while its
content should not exceed 6*HZ. It can safely be converted to an
unsigned int.

Moving tclassid right after rate_tokens to fill the 4 bytes hole
permits to save 8 bytes on 'struct dst_entry', which finally permits
to save 8 bytes on 'struct rtable'

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 6 deletions

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index e57f1673bf6b..37cdea0c26b4 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -275,18 +275,19 @@ static inline void icmp_xmit_unlock(void)
 #define XRLIM_BURST_FACTOR 6
 int xrlim_allow(struct dst_entry *dst, int timeout)
 {
-        unsigned long now;
+        unsigned long now, token = dst->rate_tokens;
         int rc = 0;
 
         now = jiffies;
-        dst->rate_tokens += now - dst->rate_last;
+        token += now - dst->rate_last;
         dst->rate_last = now;
-        if (dst->rate_tokens > XRLIM_BURST_FACTOR * timeout)
-                dst->rate_tokens = XRLIM_BURST_FACTOR * timeout;
-        if (dst->rate_tokens >= timeout) {
-                dst->rate_tokens -= timeout;
+        if (token > XRLIM_BURST_FACTOR * timeout)
+                token = XRLIM_BURST_FACTOR * timeout;
+        if (token >= timeout) {
+                token -= timeout;
                 rc = 1;
         }
+        dst->rate_tokens = token;
         return rc;
 }