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authorMartin KaFai Lau <kafai@fb.com>2015-05-22 20:56:06 -0700
committerDavid S. Miller <davem@davemloft.net>2015-05-25 13:25:35 -0400
commitd52d3997f843ffefaa8d8462790ffcaca6c74192 (patch)
treee7ad34bdd077c3af7d75acb6b6de7199c9672091 /net/ipv6/ip6_fib.c
parent83a09abd1a8badbbb715f928d07c65ac47709c47 (diff)
downloadlinux-d52d3997f843ffefaa8d8462790ffcaca6c74192.tar.bz2
ipv6: Create percpu rt6_info
After the patch 'ipv6: Only create RTF_CACHE routes after encountering pmtu exception', we need to compensate the performance hit (bouncing dst->__refcnt). Signed-off-by: Martin KaFai Lau <kafai@fb.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_fib.c')
-rw-r--r--net/ipv6/ip6_fib.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 83341b3a248d..55d19861ab20 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -154,10 +154,32 @@ static void node_free(struct fib6_node *fn)
kmem_cache_free(fib6_node_kmem, fn);
}
+static void rt6_free_pcpu(struct rt6_info *non_pcpu_rt)
+{
+ int cpu;
+
+ if (!non_pcpu_rt->rt6i_pcpu)
+ return;
+
+ for_each_possible_cpu(cpu) {
+ struct rt6_info **ppcpu_rt;
+ struct rt6_info *pcpu_rt;
+
+ ppcpu_rt = per_cpu_ptr(non_pcpu_rt->rt6i_pcpu, cpu);
+ pcpu_rt = *ppcpu_rt;
+ if (pcpu_rt) {
+ dst_free(&pcpu_rt->dst);
+ *ppcpu_rt = NULL;
+ }
+ }
+}
+
static void rt6_release(struct rt6_info *rt)
{
- if (atomic_dec_and_test(&rt->rt6i_ref))
+ if (atomic_dec_and_test(&rt->rt6i_ref)) {
+ rt6_free_pcpu(rt);
dst_free(&rt->dst);
+ }
}
static void fib6_link_table(struct net *net, struct fib6_table *tb)