From acb32ba3dee66d58704caeeb8c6ff95f60efdc66 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 8 Nov 2011 13:04:43 +0000 Subject: [PATCH] ipv4: reduce percpu needs for icmpmsg mibs Reading /proc/net/snmp on a machine with a lot of cpus is very expensive (can be ~88000 us). This is because ICMPMSG MIB uses 4096 bytes per cpu, and folding values for all possible cpus can read 16 Mbytes of memory. ICMP messages are not considered as fast path on a typical server, and eventually few cpus handle them anyway. We can afford an atomic operation instead of using percpu data. This saves 4096 bytes per cpu and per network namespace. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- include/net/icmp.h | 4 ++-- include/net/netns/mib.h | 2 +- include/net/snmp.h | 2 +- net/ipv4/af_inet.c | 8 ++++---- net/ipv4/proc.c | 9 ++++----- 5 files changed, 12 insertions(+), 13 deletions(-) diff --git a/include/net/icmp.h b/include/net/icmp.h index f0698b955b73..75d615649071 100644 --- a/include/net/icmp.h +++ b/include/net/icmp.h @@ -31,8 +31,8 @@ struct icmp_err { extern const struct icmp_err icmp_err_convert[]; #define ICMP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.icmp_statistics, field) #define ICMP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.icmp_statistics, field) -#define ICMPMSGOUT_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.icmpmsg_statistics, field+256) -#define ICMPMSGIN_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.icmpmsg_statistics, field) +#define ICMPMSGOUT_INC_STATS(net, field) SNMP_INC_STATS_ATOMIC_LONG((net)->mib.icmpmsg_statistics, field+256) +#define ICMPMSGIN_INC_STATS_BH(net, field) SNMP_INC_STATS_ATOMIC_LONG((net)->mib.icmpmsg_statistics, field) struct dst_entry; struct net_proto_family; diff --git a/include/net/netns/mib.h b/include/net/netns/mib.h index 0b44112e2366..f360135cb69f 100644 --- a/include/net/netns/mib.h +++ b/include/net/netns/mib.h @@ -10,7 +10,7 @@ struct netns_mib { DEFINE_SNMP_STAT(struct udp_mib, udp_statistics); DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics); DEFINE_SNMP_STAT(struct icmp_mib, icmp_statistics); - DEFINE_SNMP_STAT(struct icmpmsg_mib, icmpmsg_statistics); + DEFINE_SNMP_STAT_ATOMIC(struct icmpmsg_mib, icmpmsg_statistics); #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) struct proc_dir_entry *proc_net_devsnmp6; diff --git a/include/net/snmp.h b/include/net/snmp.h index 8f0f9ac0307f..0feafa68da01 100644 --- a/include/net/snmp.h +++ b/include/net/snmp.h @@ -67,7 +67,7 @@ struct icmp_mib { #define ICMPMSG_MIB_MAX __ICMPMSG_MIB_MAX struct icmpmsg_mib { - unsigned long mibs[ICMPMSG_MIB_MAX]; + atomic_long_t mibs[ICMPMSG_MIB_MAX]; }; /* ICMP6 (IPv6-ICMP) */ diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 1b5096a9875a..b2bbcd0ebd19 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1572,9 +1572,9 @@ static __net_init int ipv4_mib_init_net(struct net *net) sizeof(struct icmp_mib), __alignof__(struct icmp_mib)) < 0) goto err_icmp_mib; - if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, - sizeof(struct icmpmsg_mib), - __alignof__(struct icmpmsg_mib)) < 0) + net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib), + GFP_KERNEL); + if (!net->mib.icmpmsg_statistics) goto err_icmpmsg_mib; tcp_mib_init(net); @@ -1598,7 +1598,7 @@ err_tcp_mib: static __net_exit void ipv4_mib_exit_net(struct net *net) { - snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); + kfree(net->mib.icmpmsg_statistics); snmp_mib_free((void __percpu **)net->mib.icmp_statistics); snmp_mib_free((void __percpu **)net->mib.udplite_statistics); snmp_mib_free((void __percpu **)net->mib.udp_statistics); diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index 466ea8bb7a4d..961eed4f510a 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -288,7 +288,7 @@ static void icmpmsg_put(struct seq_file *seq) count = 0; for (i = 0; i < ICMPMSG_MIB_MAX; i++) { - val = snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics, i); + val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]); if (val) { type[count] = i; vals[count++] = val; @@ -307,6 +307,7 @@ static void icmp_put(struct seq_file *seq) { int i; struct net *net = seq->private; + atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs; seq_puts(seq, "\nIcmp: InMsgs InErrors"); for (i=0; icmpmibmap[i].name != NULL; i++) @@ -319,15 +320,13 @@ static void icmp_put(struct seq_file *seq) snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_INERRORS)); for (i=0; icmpmibmap[i].name != NULL; i++) seq_printf(seq, " %lu", - snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics, - icmpmibmap[i].index)); + atomic_long_read(ptr + icmpmibmap[i].index)); seq_printf(seq, " %lu %lu", snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTMSGS), snmp_fold_field((void __percpu **) net->mib.icmp_statistics, ICMP_MIB_OUTERRORS)); for (i=0; icmpmibmap[i].name != NULL; i++) seq_printf(seq, " %lu", - snmp_fold_field((void __percpu **) net->mib.icmpmsg_statistics, - icmpmibmap[i].index | 0x100)); + atomic_long_read(ptr + (icmpmibmap[i].index | 0x100))); } /* -- 2.34.1