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4b9d9be839
linux/net
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Eric Dumazet 4b9d9be839 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>
2011-06-08 17:05:30 -07:00
..
9p Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2011-05-26 12:13:57 -07:00
802 snap: remove one synchronize_net() 2011-05-23 16:29:24 -04:00
8021q Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-06-04 13:38:31 -07:00
appletalk appletalk: Fix OOPS in atalk_release(). 2011-03-31 18:59:10 -07:00
atm net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
ax25 ax25: Fix set-but-unused variable. 2011-04-17 00:48:31 -07:00
batman-adv net: Remove unnecessary semicolons 2011-06-05 14:33:39 -07:00
bluetooth net: Remove unnecessary semicolons 2011-06-05 14:33:39 -07:00
bridge Merge branch 'pablo/nf-2.6-updates' of git://1984.lsi.us.es/net-2.6 2011-05-27 13:04:40 -04:00
caif net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
can net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
ceph libceph: subscribe to osdmap when cluster is full 2011-05-24 11:52:11 -07:00
core v2 ethtool: remove support for ETHTOOL_GRXNTUPLE 2011-06-08 16:45:31 -07:00
dcb net: dcbnl: Update copyright dates 2011-03-14 17:02:42 -07:00
dccp ipv4: Make caller provide flowi4 key to inet_csk_route_req(). 2011-05-18 18:32:03 -04:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2011-05-20 13:43:21 -07:00
dns_resolver KEYS: Improve /proc/keys 2011-03-17 11:59:32 +11:00
dsa Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-05-05 14:59:02 -07:00
econet econet: Fix set-but-unused variable. 2011-04-17 00:15:22 -07:00
ethernet
ieee802154 ieee802154: Remove hacked CFLAGS in net/ieee802154/Makefile 2011-04-12 15:33:23 -07:00
ipv4 inetpeer: remove unused list 2011-06-08 17:05:30 -07:00
ipv6 tcp: RFC2988bis + taking RTT sample from 3WHS for the passive open side 2011-06-08 17:05:30 -07:00
ipx ipx: fix ipx_release() 2011-03-21 18:16:39 -07:00
irda irda: Fix error propagation in ircomm_lmp_connect_response() 2011-05-19 18:58:39 -04:00
iucv [S390] irq: merge irq.c and s390_ext.c 2011-05-26 09:48:24 +02:00
key net: convert %p usage to %pK 2011-05-24 01:13:12 -04:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2011-05-20 13:43:21 -07:00
lapb
llc llc: Fix length check in llc_fixup_skb(). 2011-04-11 18:59:05 -07:00
mac80211 mac80211: Stop BA session event from device 2011-06-07 14:41:36 -04:00
netfilter IPVS: bug in ip_vs_ftp, same list heaad used in all netns. 2011-05-27 13:37:46 +02:00
netlabel Remove prefetch() from <linux/skbuff.h> and "netlabel_addrlist.h" 2011-05-22 21:43:41 -07:00
netlink net: convert %p usage to %pK 2011-05-24 01:13:12 -04:00
netrom NET: AX.25, NETROM, ROSE: Remove SOCK_DEBUG calls 2011-04-14 00:20:07 -07:00
packet af-packet: Use existing netdev reference for bound sockets. 2011-06-05 14:16:28 -07:00
phonet net: convert %p usage to %pK 2011-05-24 01:13:12 -04:00
rds net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
rfkill net: rfkill: add generic gpio rfkill driver 2011-05-19 13:53:54 -04:00
rose NET: AX.25, NETROM, ROSE: Remove SOCK_DEBUG calls 2011-04-14 00:20:07 -07:00
rxrpc rxrpc: Fix set but unused variable 'usage' in rxrpc_get_transport() 2011-05-19 18:51:50 -04:00
sched net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
sctp sctp: Guard IPV6 specific code properly. 2011-06-06 13:05:55 -07:00
sunrpc net: remove interrupt.h inclusion from netdevice.h 2011-06-06 22:55:11 -07:00
tipc tipc: Revise timings used when sending link request messages 2011-05-10 16:04:02 -04:00
unix net: convert %p usage to %pK 2011-05-24 01:13:12 -04:00
wanrouter Fix common misspellings 2011-03-31 11:26:23 -03:00
wimax
wireless Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 2011-06-07 14:07:11 -04:00
x25 Fix common misspellings 2011-03-31 11:26:23 -03:00
xfrm Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-3.6 2011-05-11 14:26:58 -04:00
compat.c net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
Kconfig bpf: depends on MODULES 2011-04-29 10:20:53 -07:00
Makefile net: Enter net/ipv6/ even if CONFIG_IPV6=n 2011-03-07 12:50:52 -08:00
nonet.c
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2011-05-20 13:43:21 -07:00
sysctl_net.c
TUNABLE