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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-05-19 22:07:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-31 00:24:01 -0700 |
| commit | 27f39c73e63833b4c081a0d681d88b4184a0491d (patch) | |
| tree | 49cca2881bcd9212cd99a1e30c83f40a20eefc55 | |
| parent | 604c1b1868f16e7b2fc13401d8c9147f167bec0a (diff) | |
| download | linux-3.10-27f39c73e63833b4c081a0d681d88b4184a0491d.tar.gz linux-3.10-27f39c73e63833b4c081a0d681d88b4184a0491d.tar.bz2 linux-3.10-27f39c73e63833b4c081a0d681d88b4184a0491d.zip | |
net: Use __this_cpu_inc() in fast path
This patch saves 224 bytes of text on my machine.
__this_cpu_inc() generates a single instruction, using no scratch
registers :
65 ff 04 25 a8 30 01 00 incl %gs:0x130a8
instead of :
48 c7 c2 80 30 01 00 mov $0x13080,%rdx
65 48 8b 04 25 88 ea 00 00 mov %gs:0xea88,%rax
83 44 10 28 01 addl $0x1,0x28(%rax,%rdx,1)
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/core/dev.c | 3 | ||||
| -rw-r--r-- | net/ipv4/route.c | 3 |
2 files changed, 2 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 1845b08c624..7d76b056aa3 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2822,8 +2822,7 @@ static int __netif_receive_skb(struct sk_buff *skb) skb->dev = master; } - __get_cpu_var(softnet_data).processed++; - + __this_cpu_inc(softnet_data.processed); skb_reset_network_header(skb); skb_reset_transport_header(skb); skb->mac_len = skb->network_header - skb->mac_header; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 560acc677ce..8495bceec76 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -253,8 +253,7 @@ static unsigned rt_hash_mask __read_mostly; static unsigned int rt_hash_log __read_mostly; static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); -#define RT_CACHE_STAT_INC(field) \ - (__raw_get_cpu_var(rt_cache_stat).field++) +#define RT_CACHE_STAT_INC(field) __this_cpu_inc(rt_cache_stat.field) static inline unsigned int rt_hash(__be32 daddr, __be32 saddr, int idx, int genid) |