inetpeer: remove unused list

Andi Kleen and Tim Chen reported huge contention on inetpeer
unused_peers.lock, on memcached workload on a 40 core machine, with
disabled route cache.

It appears we constantly flip peers refcnt between 0 and 1 values, and
we must insert/remove peers from unused_peers.list, holding a contended
spinlock.

Remove this list completely and perform a garbage collection on-the-fly,
at lookup time, using the expired nodes we met during the tree
traversal.

This removes a lot of code, makes locking more standard, and obsoletes
two sysctls (inet_peer_gc_mintime and inet_peer_gc_maxtime). This also
removes two pointers in inet_peer structure.

There is still a false sharing effect because refcnt is in first cache
line of object [were the links and keys used by lookups are located], we
might move it at the end of inet_peer structure to let this first cache
line mostly read by cpus.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Andi Kleen <andi@firstfloor.org>
CC: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 8a159cc3d68b..1f0966f91760 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -32,7 +32,6 @@ struct inet_peer {
 	struct inet_peer __rcu	*avl_left, *avl_right;
 	struct inetpeer_addr	daddr;
 	__u32			avl_height;
-	struct list_head	unused;
 	__u32			dtime;		/* the time of last use of not
 						 * referenced entries */
 	atomic_t		refcnt;
@@ -56,6 +55,7 @@ struct inet_peer {
 			struct inetpeer_addr_base	redirect_learned;
 		};
 		struct rcu_head         rcu;
+		struct inet_peer	*gc_next;
 	};
 };