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230140cffa
linux/include/net
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Eric Dumazet 230140cffa [INET]: Remove per bucket rwlock in tcp/dccp ehash table. 
As done two years ago on IP route cache table (commit
22c047ccbc) , we can avoid using one
lock per hash bucket for the huge TCP/DCCP hash tables.

On a typical x86_64 platform, this saves about 2MB or 4MB of ram, for
litle performance differences. (we hit a different cache line for the
rwlock, but then the bucket cache line have a better sharing factor
among cpus, since we dirty it less often). For netstat or ss commands
that want a full scan of hash table, we perform fewer memory accesses.

Using a 'small' table of hashed rwlocks should be more than enough to
provide correct SMP concurrency between different buckets, without
using too much memory. Sizing of this table depends on
num_possible_cpus() and various CONFIG settings.

This patch provides some locking abstraction that may ease a future
work using a different model for TCP/DCCP table.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-11-07 04:15:11 -08:00
..
9p Use helpers to obtain task pid in printks 2007-10-19 11:53:43 -07:00
bluetooth [Bluetooth] Add support for handling simple eSCO links 2007-10-22 02:59:47 -07:00
irda [IRDA]: Make ircomm_tty static. 2007-10-26 03:56:43 -07:00
iucv [AF_IUCV]: postpone receival of iucv-packets 2007-10-10 16:54:51 -07:00
netfilter [INET]: Collect common frag sysctl variables together 2007-10-15 12:26:40 -07:00
sctp SCTP endianness annotations regression 2007-10-29 07:41:32 -07:00
tc_act [PKT_SCHED]: Add stateless NAT 2007-10-10 16:53:11 -07:00
tipc [TIPC]: Optimize stream send routine to avoid fragmentation 2007-07-10 22:06:12 -07:00
act_api.h [NET_SCHED]: Kill CONFIG_NET_CLS_POLICE 2007-07-15 00:03:05 -07:00
addrconf.h [IPV6] MIP6: Loadable module support for MIPv6. 2007-07-10 22:15:42 -07:00
af_rxrpc.h [AF_RXRPC]: Add an interface to the AF_RXRPC module for the AFS filesystem to use 2007-04-26 15:50:17 -07:00
af_unix.h [AF_UNIX]: Make code static. 2007-07-31 02:28:27 -07:00
ah.h [IPSEC]: Get rid of ipv6_{auth,esp,comp}_hdr 2007-10-10 16:55:55 -07:00
arp.h [IPV6]: Assorted trivial endianness annotations. 2006-12-02 21:22:50 -08:00
atmclip.h [ATM]: Annotations. 2006-12-02 21:22:55 -08:00
ax25.h [NET]: Move hardware header operations out of netdevice. 2007-10-10 16:52:52 -07:00
ax88796.h ax88796: add 93cx6 eeprom support 2007-10-10 16:53:56 -07:00
cfg80211.h [NL80211]: add netlink interface to cfg80211 2007-10-10 16:52:14 -07:00
checksum.h [NET]: Make mangling a checksum (0 -> 0xffff on the wire) explicit. 2006-12-02 21:23:39 -08:00
cipso_ipv4.h [NetLabel]: consolidate the struct socket/sock handling to just struct sock 2007-06-08 13:33:09 -07:00
compat.h [NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution 2007-04-25 22:24:04 -07:00
datalink.h
dn_dev.h [DECnet]: Endian annotation and fixes for DECnet. 2006-03-20 22:42:39 -08:00
dn_fib.h [DECNet]: Use rtnl registration interface 2007-04-25 22:27:12 -07:00
dn_neigh.h [DECnet]: Endian annotation and fixes for DECnet. 2006-03-20 22:42:39 -08:00
dn_nsp.h [DECnet]: Endian annotation and fixes for DECnet. 2006-03-20 22:42:39 -08:00
dn_route.h [NET]: Wrap netdevice hardware header creation. 2007-10-10 16:52:50 -07:00
dn.h [DECNET]: Another unnecessary net/tcp.h inclusion in net/dn.h 2007-07-10 23:02:12 -07:00
dsfield.h [NET]: IP header modifier helpers annotations. 2006-12-02 21:23:40 -08:00
dst.h [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
esp.h cleanup asm/scatterlist.h includes 2007-11-02 08:47:06 +01:00
fib_rules.h [IPV4/IPV6/DECNET]: Small cleanup for fib rules. 2007-10-10 16:51:22 -07:00
flow.h [IPV6] MIP6: Kill unnecessary ifdefs. 2007-07-10 22:15:41 -07:00
gen_stats.h
genetlink.h [GENETLINK]: Dynamic multicast groups. 2007-07-18 15:47:52 -07:00
icmp.h [IPV4]: Add ICMPMsgStats MIB (RFC 4293) 2007-10-10 16:51:28 -07:00
ieee80211_crypt.h [PATCH] Update my email address from jkmaline@cc.hut.fi to j@w1.fi 2007-04-28 11:01:01 -04:00
ieee80211_radiotap.h [MAC80211]: Add get_unaligned to ieee80211_get_radiotap_len 2007-10-10 16:47:40 -07:00
ieee80211.h [NET]: Introduce and use print_mac() and DECLARE_MAC_BUF() 2007-10-10 16:51:42 -07:00
ieee80211softmac_wx.h [PATCH] softmac: add SIOCSIWMLME 2006-04-24 16:15:58 -04:00
ieee80211softmac.h [IEEE80211]: Fix softmac lockdep reports. 2007-10-10 16:52:22 -07:00
if_inet6.h [IPV6]: Add ICMPMsgStats MIB (RFC 4293) [rev 2] 2007-10-10 16:51:27 -07:00
inet6_connection_sock.h [TCP]: Restore SKB socket owner setting in tcp_transmit_skb(). 2007-01-26 01:04:55 -08:00
inet6_hashtables.h [INET]: Use jhash + random secret for ehash. 2007-04-25 22:28:06 -07:00
inet_common.h [NET]: move struct proto_ops to const 2006-01-03 13:11:15 -08:00
inet_connection_sock.h [TCP]: Restore SKB socket owner setting in tcp_transmit_skb(). 2007-01-26 01:04:55 -08:00
inet_ecn.h [SK_BUFF]: Convert skb->tail to sk_buff_data_t 2007-04-25 22:26:28 -07:00
inet_frag.h [INET]: Remove no longer needed ->equal callback 2007-10-17 19:47:56 -07:00
inet_hashtables.h [INET]: Remove per bucket rwlock in tcp/dccp ehash table. 2007-11-07 04:15:11 -08:00
inet_sock.h [UDP]: Make use of inet_iif() when doing socket lookups. 2007-10-25 18:54:46 -07:00
inet_timewait_sock.h [NET]: Add a network namespace parameter to struct sock 2007-10-10 16:49:05 -07:00
inetpeer.h [IPV4] inet_peer: Group together avl_left, avl_right, v4daddr to speedup lookups on some CPUS 2006-10-20 00:28:35 -07:00
ip6_checksum.h [IPV6]: Dumb typo in generic csum_ipv6_magic() 2006-12-22 11:12:07 -08:00
ip6_fib.h [IPV6] XFRM: Fix connected socket to use transformation. 2007-10-10 16:48:32 -07:00
ip6_route.h [IPv6]: Use rtnl registration interface 2007-04-25 22:27:13 -07:00
ip6_tunnel.h
ip_fib.h [IPV4]: Compact some ifdefs in the fib code. 2007-11-07 04:11:41 -08:00
ip_vs.h [IPVS]: Synchronize closing of Connections 2007-11-07 04:15:10 -08:00
ip.h [INET]: Consolidate the xxx_evictor 2007-10-15 12:26:42 -07:00
ipcomp.h [IPSEC]: Get rid of ipv6_{auth,esp,comp}_hdr 2007-10-10 16:55:55 -07:00
ipconfig.h [NET]: ipconfig and nfsroot annotations 2006-12-02 21:21:09 -08:00
ipip.h [IPV6] net/ipv6/sit.c: make 2 functions static 2006-12-02 21:26:15 -08:00
ipv6.h [INET]: Remove no longer needed ->equal callback 2007-10-17 19:47:56 -07:00
ipx.h [SK_BUFF]: Introduce skb_transport_header(skb) 2007-04-25 22:25:31 -07:00
iw_handler.h [NL80211]: add netlink interface to cfg80211 2007-10-10 16:52:14 -07:00
lapb.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h [NET]: Make socket creation namespace safe. 2007-10-10 16:49:07 -07:00
llc_if.h [LLC]: add multicast support for datagrams 2006-06-17 21:26:08 -07:00
llc_pdu.h [SK_BUFF]: Introduce skb_network_header() 2007-04-25 22:24:59 -07:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h [LLC]: llc_mac_hdr_init const arguments 2006-03-20 22:59:36 -08:00
mac80211.h [MAC80211]: Update beacon_update callback documentation 2007-10-10 16:54:21 -07:00
mip6.h [IPV6] MIP6: Loadable module support for MIPv6. 2007-07-10 22:15:42 -07:00
ndisc.h [IPv6]: Export userland ND options through netlink (RDNSS support) 2007-10-10 21:22:05 -07:00
neighbour.h [NEIGH]: Use rtnl registration interface 2007-04-25 22:27:06 -07:00
net_namespace.h [NET]: Relax the reference counting of init_net_ns 2007-11-01 00:43:49 -07:00
netdma.h Remove all inclusions of <linux/config.h> 2006-10-04 03:38:54 -04:00
netevent.h [NET]: Network Event Notifier Mechanism. 2006-08-02 13:38:20 -07:00
netlabel.h SELinux: restore proper NetLabel caching behavior 2007-08-02 11:52:21 -04:00
netlink.h [NET]: make netlink user -> kernel interface synchronious 2007-10-10 21:15:29 -07:00
netrom.h [PATCH] mark struct file_operations const 1 2007-02-12 09:48:44 -08:00
nexthop.h [IPv4]: FIB configuration using struct fib_config 2006-09-22 14:55:04 -07:00
p8022.h
pkt_cls.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
pkt_sched.h [NET]: Move hardware header operations out of netdevice. 2007-10-10 16:52:52 -07:00
protocol.h [IPV6]: Replace sk_buff ** with sk_buff * in input handlers 2007-10-15 12:50:28 -07:00
psnap.h
raw.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
rawv6.h [IPV6] MIP6: Loadable module support for MIPv6. 2007-07-10 22:15:42 -07:00
red.h [NET_SCHED]: turn PSCHED_GET_TIME into inline function 2007-04-25 22:27:55 -07:00
request_sock.h [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
rose.h [ROSE]: Fix rose.ko oops on unload 2007-10-07 23:44:17 -07:00
route.h [IPV4]: Make ip_tos2prio const. 2007-07-10 22:19:04 -07:00
rtnetlink.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
sch_generic.h [NET_CLS_ACT]: Introduce skb_act_clone 2007-10-26 02:47:23 -07:00
scm.h pid namespaces: changes to show virtual ids to user 2007-10-19 11:53:40 -07:00
slhc_vj.h
snmp.h [IPV4]: Add ICMPMsgStats MIB (RFC 4293) 2007-10-10 16:51:28 -07:00
sock.h [NET]: Define infrastructure to keep 'inuse' changes in an efficent SMP/NUMA way. 2007-11-07 04:08:57 -08:00
syncppp.h
tcp_states.h [TCP]: Move the TCPF_ enum to tcp_states.h 2006-01-03 13:10:57 -08:00
tcp.h [TCP]: Remove unneeded implicit type cast when calling tcp_minshall_update() 2007-10-23 21:27:55 -07:00
timewait_sock.h [PATCH] slab: remove kmem_cache_t 2006-12-07 08:39:25 -08:00
transp_v6.h [NET]: Supporting UDP-Lite (RFC 3828) in Linux 2006-12-02 21:22:46 -08:00
udp.h [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
udplite.h [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
veth.h [NET]: Virtual ethernet device driver. 2007-10-10 16:47:46 -07:00
wext.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
wireless.h [WIRELESS] cfg80211: New wireless config infrastructure. 2007-04-25 22:29:41 -07:00
x25.h [X.25]: Adds /proc/sys/net/x25/x25_forward to control forwarding. 2007-02-08 13:34:36 -08:00
x25device.h [SK_BUFF]: Introduce skb_reset_mac_header(skb) 2007-04-25 22:24:32 -07:00
xfrm.h [NET]: Don't declare extern variables in net/core/sysctl_net_core.c 2007-10-23 21:27:56 -07:00