From 6c383b3a565dbf07cf6665e5da535f8668479453 Mon Sep 17 00:00:00 2001 From: Marcelo Ricardo Leitner Date: Thu, 14 Aug 2014 16:44:52 -0300 Subject: [PATCH] ipv4: move route garbage collector to work queue Currently the route garbage collector gets called by dst_alloc() if it have more entries than the threshold. But it's an expensive call, that don't really need to be done by then. Another issue with current way is that it allows running the garbage collector with the same start parameters on multiple CPUs at once, which is not optimal. A system may even soft lockup if the cache is big enough as the garbage collectors will be fighting over the hash lock entries. This patch thus moves the garbage collector to run asynchronously on a work queue, much similar to how rt_expire_check runs. There is one condition left that allows multiple executions, which is handled by the next patch. Signed-off-by: Marcelo Ricardo Leitner Acked-by: Hannes Frederic Sowa Signed-off-by: Ben Hutchings --- net/ipv4/route.c | 43 +++++++++++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 14 deletions(-) diff --git a/net/ipv4/route.c b/net/ipv4/route.c index d361dc0037c0..5706bc1b4f89 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -151,6 +151,9 @@ static void ipv4_link_failure(struct sk_buff *skb); static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu); static int rt_garbage_collect(struct dst_ops *ops); +static void __rt_garbage_collect(struct work_struct *w); +static DECLARE_WORK(rt_gc_worker, __rt_garbage_collect); + static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev, int how) { @@ -979,7 +982,7 @@ static void rt_emergency_hash_rebuild(struct net *net) and when load increases it reduces to limit cache size. */ -static int rt_garbage_collect(struct dst_ops *ops) +static void __do_rt_garbage_collect(int elasticity, int min_interval) { static unsigned long expire = RT_GC_TIMEOUT; static unsigned long last_gc; @@ -998,7 +1001,7 @@ static int rt_garbage_collect(struct dst_ops *ops) RT_CACHE_STAT_INC(gc_total); - if (now - last_gc < ip_rt_gc_min_interval && + if (now - last_gc < min_interval && entries < ip_rt_max_size) { RT_CACHE_STAT_INC(gc_ignored); goto out; @@ -1006,7 +1009,7 @@ static int rt_garbage_collect(struct dst_ops *ops) entries = dst_entries_get_slow(&ipv4_dst_ops); /* Calculate number of entries, which we want to expire now. */ - goal = entries - (ip_rt_gc_elasticity << rt_hash_log); + goal = entries - (elasticity << rt_hash_log); if (goal <= 0) { if (equilibrium < ipv4_dst_ops.gc_thresh) equilibrium = ipv4_dst_ops.gc_thresh; @@ -1023,7 +1026,7 @@ static int rt_garbage_collect(struct dst_ops *ops) equilibrium = entries - goal; } - if (now - last_gc >= ip_rt_gc_min_interval) + if (now - last_gc >= min_interval) last_gc = now; if (goal <= 0) { @@ -1088,15 +1091,33 @@ static int rt_garbage_collect(struct dst_ops *ops) if (net_ratelimit()) printk(KERN_WARNING "dst cache overflow\n"); RT_CACHE_STAT_INC(gc_dst_overflow); - return 1; + return; work_done: - expire += ip_rt_gc_min_interval; + expire += min_interval; if (expire > ip_rt_gc_timeout || dst_entries_get_fast(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh || dst_entries_get_slow(&ipv4_dst_ops) < ipv4_dst_ops.gc_thresh) expire = ip_rt_gc_timeout; -out: return 0; +out: return; +} + +static void __rt_garbage_collect(struct work_struct *w) +{ + __do_rt_garbage_collect(ip_rt_gc_elasticity, ip_rt_gc_min_interval); +} + +static int rt_garbage_collect(struct dst_ops *ops) +{ + if (!work_pending(&rt_gc_worker)) + schedule_work(&rt_gc_worker); + + if (dst_entries_get_fast(&ipv4_dst_ops) >= ip_rt_max_size || + dst_entries_get_slow(&ipv4_dst_ops) >= ip_rt_max_size) { + RT_CACHE_STAT_INC(gc_dst_overflow); + return 1; + } + return 0; } /* @@ -1291,13 +1312,7 @@ restart: it is most likely it holds some neighbour records. */ if (attempts-- > 0) { - int saved_elasticity = ip_rt_gc_elasticity; - int saved_int = ip_rt_gc_min_interval; - ip_rt_gc_elasticity = 1; - ip_rt_gc_min_interval = 0; - rt_garbage_collect(&ipv4_dst_ops); - ip_rt_gc_min_interval = saved_int; - ip_rt_gc_elasticity = saved_elasticity; + __do_rt_garbage_collect(1, 0); goto restart; } -- 2.39.2