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authorEric Dumazet <dada1@cosmosbay.com>2008-01-22 06:18:34 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:10:41 -0800
commit69a73829dbb10e7c8554e66a80cb4fde57347fff (patch)
tree032f67850cd73fc71b573f2a155a5037bde53f71 /net/ipv4
parent81566e8322c3f6c6f9a2277fe0e440fee8d917bd (diff)
[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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/icmp.c13
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;
}