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, 0 insertions, 10 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index d3d653a5f9b9..3dcb26cd33f6 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -106,16 +106,6 @@ inet_peer_maxttl - INTEGER
         when the number of entries in the pool is very small).
         Measured in seconds.
 
-inet_peer_gc_mintime - INTEGER
-        Minimum interval between garbage collection passes.  This interval is
-        in effect under high memory pressure on the pool.
-        Measured in seconds.
-
-inet_peer_gc_maxtime - INTEGER
-        Minimum interval between garbage collection passes.  This interval is
-        in effect under low (or absent) memory pressure on the pool.
-        Measured in seconds.
-
 TCP variables:
 
 somaxconn - INTEGER