ipvs: convert services to rcu
authorJulian Anastasov <ja@ssi.bg>
Fri, 22 Mar 2013 09:46:53 +0000 (11:46 +0200)
committerPablo Neira Ayuso <pablo@netfilter.org>
Mon, 1 Apr 2013 22:23:58 +0000 (00:23 +0200)
commitceec4c3816818459d90c92152e61371ff5b1d5a1
tree04cfae26902321af225d53b161c9652e5d2bb306
parent413c2d04e9494ca38629d8a7ffeff1e4398a9fe3
ipvs: convert services to rcu

This is the final step in RCU conversion.

Things that are removed:

- svc->usecnt: now svc is accessed under RCU read lock
- svc->inc: and some unused code
- ip_vs_bind_pe and ip_vs_unbind_pe: no ability to replace PE
- __ip_vs_svc_lock: replaced with RCU
- IP_VS_WAIT_WHILE: now readers lookup svcs and dests under
RCU and work in parallel with configuration

Other changes:

- before now, a RCU read-side critical section included the
calling of the schedule method, now it is extended to include
service lookup
- ip_vs_svc_table and ip_vs_svc_fwm_table are now using hlist
- svc->pe and svc->scheduler remain to the end (of grace period),
the schedulers are prepared for such RCU readers
even after done_service is called but they need
to use synchronize_rcu because last ip_vs_scheduler_put
can happen while RCU read-side critical sections
use an outdated svc->scheduler pointer
- as planned, update_service is removed
- empty services can be freed immediately after grace period.
If dests were present, the services are freed from
the dest trash code

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
18 files changed:
include/net/ip_vs.h
net/netfilter/ipvs/ip_vs_core.c
net/netfilter/ipvs/ip_vs_ctl.c
net/netfilter/ipvs/ip_vs_dh.c
net/netfilter/ipvs/ip_vs_lblc.c
net/netfilter/ipvs/ip_vs_lblcr.c
net/netfilter/ipvs/ip_vs_lc.c
net/netfilter/ipvs/ip_vs_nq.c
net/netfilter/ipvs/ip_vs_pe.c
net/netfilter/ipvs/ip_vs_proto_sctp.c
net/netfilter/ipvs/ip_vs_proto_tcp.c
net/netfilter/ipvs/ip_vs_proto_udp.c
net/netfilter/ipvs/ip_vs_rr.c
net/netfilter/ipvs/ip_vs_sched.c
net/netfilter/ipvs/ip_vs_sed.c
net/netfilter/ipvs/ip_vs_sh.c
net/netfilter/ipvs/ip_vs_wlc.c
net/netfilter/ipvs/ip_vs_wrr.c