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Message-Id: <1470651742-15195-3-git-send-email-hejianet@gmail.com> 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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