ipv6: reduce per device ICMP mib sizes
ipv6 has per device ICMP SNMP counters, taking too much space because
they use percpu storage.
needed size per device is :
(512+4)*sizeof(long)*number_of_possible_cpus*2
On a 32bit kernel, 16 possible cpus, this wastes more than 64kbytes of
memory per ipv6 enabled network device, taken in vmalloc pool.
Since ICMP messages are rare, just use shared counters (atomic_long_t)
Per network space ICMP counters are still using percpu memory, we might
also convert them to shared counters in a future patch.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f2f9b2e..3cfbbf3 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -289,19 +289,19 @@
sizeof(struct ipstats_mib),
__alignof__(struct ipstats_mib)) < 0)
goto err_ip;
- if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
- sizeof(struct icmpv6_mib),
- __alignof__(struct icmpv6_mib)) < 0)
+ idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
+ GFP_KERNEL);
+ if (!idev->stats.icmpv6dev)
goto err_icmp;
- if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
- sizeof(struct icmpv6msg_mib),
- __alignof__(struct icmpv6msg_mib)) < 0)
+ idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
+ GFP_KERNEL);
+ if (!idev->stats.icmpv6msgdev)
goto err_icmpmsg;
return 0;
err_icmpmsg:
- snmp_mib_free((void __percpu **)idev->stats.icmpv6);
+ kfree(idev->stats.icmpv6dev);
err_icmp:
snmp_mib_free((void __percpu **)idev->stats.ipv6);
err_ip:
@@ -310,8 +310,8 @@
static void snmp6_free_dev(struct inet6_dev *idev)
{
- snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
- snmp_mib_free((void __percpu **)idev->stats.icmpv6);
+ kfree(idev->stats.icmpv6msgdev);
+ kfree(idev->stats.icmpv6dev);
snmp_mib_free((void __percpu **)idev->stats.ipv6);
}
@@ -3838,7 +3838,7 @@
+ nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
}
-static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
+static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
int items, int bytes)
{
int i;
@@ -3848,7 +3848,7 @@
/* Use put_unaligned() because stats may not be aligned for u64. */
put_unaligned(items, &stats[0]);
for (i = 1; i < items; i++)
- put_unaligned(snmp_fold_field(mib, i), &stats[i]);
+ put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
memset(&stats[items], 0, pad);
}
@@ -3877,7 +3877,7 @@
IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
break;
case IFLA_INET6_ICMP6STATS:
- __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
+ __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
break;
}
}