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net: snmp: inline snmp_get_cpu_field()

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This trivial function is called ~90,000 times on 256 cpus hosts,
when reading /proc/net/netstat. And this number keeps inflating.

Inlining it saves many cycles.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2021-09-29 18:03:32 -07:00 committed by David S. Miller
parent dee3b2d0fa
commit 59f09ae8fa
2 changed files with 5 additions and 7 deletions
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6
include/net/ip.h
View File

@ -291,7 +291,11 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
#define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
static inline u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
{
return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
}
unsigned long snmp_fold_field(void __percpu *mib, int offt);
#if BITS_PER_LONG==32
u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,

6
net/ipv4/af_inet.c
View File

@ -1662,12 +1662,6 @@ int inet_ctl_sock_create(struct sock **sk, unsigned short family,
}
EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
{
return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
}
EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
unsigned long snmp_fold_field(void __percpu *mib, int offt)
{
unsigned long res = 0;