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| author | Eric Dumazet <dada1@cosmosbay.com> | 2007-11-16 03:32:10 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:54:08 -0800 |
| commit | 8dbde28d9711475adfe0e9c88505e38743cdc2a7 (patch) | |
| tree | 0f41aade985a5626ece9c2007fde14c1ced2a065 | |
| parent | 68f8353b480e5f2e136c38a511abdbb88eaa8ce2 (diff) | |
| download | op-kernel-dev-8dbde28d9711475adfe0e9c88505e38743cdc2a7.zip op-kernel-dev-8dbde28d9711475adfe0e9c88505e38743cdc2a7.tar.gz | |
[NET]: NET_CLS_ROUTE : convert ip_rt_acct to per_cpu variables
ip_rt_acct needs 4096 bytes per cpu to perform some accounting.
It is actually allocated as a single huge array [4096*NR_CPUS]
(rounded up to a power of two)
Converting it to a per cpu variable is wanted to :
- Save space on machines were num_possible_cpus() < NR_CPUS
- Better NUMA placement (each cpu gets memory on its node)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/ip_input.c | 2 | ||||
| -rw-r--r-- | net/ipv4/route.c | 15 |
2 files changed, 4 insertions, 13 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c index 5b8a760..4068e17 100644 --- a/net/ipv4/ip_input.c +++ b/net/ipv4/ip_input.c @@ -347,7 +347,7 @@ static int ip_rcv_finish(struct sk_buff *skb) #ifdef CONFIG_NET_CLS_ROUTE if (unlikely(skb->dst->tclassid)) { - struct ip_rt_acct *st = ip_rt_acct + 256*smp_processor_id(); + struct ip_rt_acct *st = per_cpu_ptr(ip_rt_acct, smp_processor_id()); u32 idx = skb->dst->tclassid; st[idx&0xFF].o_packets++; st[idx&0xFF].o_bytes+=skb->len; diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 94ef788..a21021b 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2858,12 +2858,10 @@ ctl_table ipv4_route_table[] = { #endif #ifdef CONFIG_NET_CLS_ROUTE -struct ip_rt_acct *ip_rt_acct; - -/* This code sucks. But you should have seen it before! --RR */ +struct ip_rt_acct *ip_rt_acct __read_mostly; /* IP route accounting ptr for this logical cpu number. */ -#define IP_RT_ACCT_CPU(i) (ip_rt_acct + i * 256) +#define IP_RT_ACCT_CPU(cpu) (per_cpu_ptr(ip_rt_acct, cpu)) #ifdef CONFIG_PROC_FS static int ip_rt_acct_read(char *buffer, char **start, off_t offset, @@ -2923,16 +2921,9 @@ int __init ip_rt_init(void) (jiffies ^ (jiffies >> 7))); #ifdef CONFIG_NET_CLS_ROUTE - { - int order; - for (order = 0; - (PAGE_SIZE << order) < 256 * sizeof(struct ip_rt_acct) * NR_CPUS; order++) - /* NOTHING */; - ip_rt_acct = (struct ip_rt_acct *)__get_free_pages(GFP_KERNEL, order); + ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct)); if (!ip_rt_acct) panic("IP: failed to allocate ip_rt_acct\n"); - memset(ip_rt_acct, 0, PAGE_SIZE << order); - } #endif ipv4_dst_ops.kmem_cachep = |
