]> git.karo-electronics.de Git - linux-beck.git/commit
net: Convert TCP & DCCP hash tables to use RCU / hlist_nulls
authorEric Dumazet <dada1@cosmosbay.com>
Mon, 17 Nov 2008 03:40:17 +0000 (19:40 -0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 17 Nov 2008 03:40:17 +0000 (19:40 -0800)
commit3ab5aee7fe840b5b1b35a8d1ac11c3de5281e611
tree468296b7be813643248d4ca67497d6ddb6934fc6
parent88ab1932eac721c6e7336708558fa5ed02c85c80
net: Convert TCP & DCCP hash tables to use RCU / hlist_nulls

RCU was added to UDP lookups, using a fast infrastructure :
- sockets kmem_cache use SLAB_DESTROY_BY_RCU and dont pay the
  price of call_rcu() at freeing time.
- hlist_nulls permits to use few memory barriers.

This patch uses same infrastructure for TCP/DCCP established
and timewait sockets.

Thanks to SLAB_DESTROY_BY_RCU, no slowdown for applications
using short lived TCP connections. A followup patch, converting
rwlocks to spinlocks will even speedup this case.

__inet_lookup_established() is pretty fast now we dont have to
dirty a contended cache line (read_lock/read_unlock)

Only established and timewait hashtable are converted to RCU
(bind table and listen table are still using traditional locking)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
13 files changed:
include/net/inet_hashtables.h
include/net/inet_timewait_sock.h
net/core/sock.c
net/dccp/ipv4.c
net/dccp/ipv6.c
net/dccp/proto.c
net/ipv4/inet_diag.c
net/ipv4/inet_hashtables.c
net/ipv4/inet_timewait_sock.c
net/ipv4/tcp.c
net/ipv4/tcp_ipv4.c
net/ipv6/inet6_hashtables.c
net/ipv6/tcp_ipv6.c