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Date: Mon, 8 Aug 2016 18:22:21 +0800
From: Jia He <hejianet@...il.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Jia He <hejianet@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>
Subject: [RFC PATCH 2/3] net: Replace for_each_possible_cpu with for_each_online_cpu
In PowerPC server with large number cpus, the loop index in smt=1 could be
reduced to 1/8 compared with smt=8.
Thus cache misses can be reduced.
Signed-off-by: Jia He <hejianet@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: James Morris <jmorris@...ei.org>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: Patrick McHardy <kaber@...sh.net>
---
net/ipv6/addrconf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 43fa8d0..1fce613 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4969,7 +4969,7 @@ static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
buff[0] = IPSTATS_MIB_MAX;
- for_each_possible_cpu(c) {
+ for_each_online_cpu(c) {
for (i = 1; i < IPSTATS_MIB_MAX; i++)
buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
}
--
2.5.0
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