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Eric Dumazet 3137663dfb net: avoid synchronize_rcu() in dev_deactivate_many 
dev_deactivate_many() issues one synchronize_rcu() call after qdiscs set
to noop_qdisc.

This call is here to make sure they are no outstanding qdisc-less
dev_queue_xmit calls before returning to caller.

But in dismantle phase, we dont have to wait, because we wont activate
again the device, and we are going to wait one rcu grace period later in
rollback_registered_many().

After this patch, device dismantle uses one synchronize_net() and one
rcu_barrier() call only, so we have a ~30% speedup and a smaller RTNL
latency.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>,
CC: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2011-05-22 21:01:20 -04:00
..
Kconfig networking: NET_CLS_ROUTE4 depends on INET 2011-05-19 19:23:28 -04:00
Makefile pkt_sched: QFQ - quick fair queue scheduler 2011-04-04 11:10:24 -07:00
act_api.c net,rcu: convert call_rcu(tcf_common_free_rcu) to kfree_rcu() 2011-05-07 22:50:48 -07:00
act_csum.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
act_gact.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
act_ipt.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
act_mirred.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
act_nat.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
act_pedit.c Fix common misspellings 2011-03-31 11:26:23 -03:00
act_police.c net,act_police,rcu: remove rcu_barrier() 2011-05-07 22:50:54 -07:00
act_simple.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
act_skbedit.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_api.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_basic.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_cgroup.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_flow.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2011-01-20 00:06:15 -08:00
cls_fw.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_route.c ipv4: Remove flowi from struct rtable. 2011-03-04 21:55:31 -08:00
cls_rsvp.c [NET_SCHED]: Remove unnecessary includes 2007-07-10 22:16:41 -07:00
cls_rsvp.h net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_rsvp6.c [NET_SCHED]: Remove unnecessary includes 2007-07-10 22:16:41 -07:00
cls_tcindex.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
cls_u32.c cls_u32: fix sparse warnings 2011-02-22 11:22:33 -08:00
em_cmp.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
em_meta.c Fix common misspellings 2011-03-31 11:26:23 -03:00
em_nbyte.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
em_text.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
em_u32.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
ematch.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
sch_api.c pkt_sched: Kill set but unused variable 'protocol' in tc_classify() 2011-05-19 18:32:55 -04:00
sch_atm.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
sch_blackhole.c pkt_sched: Add qdisc->ops->peek() implementation. 2008-10-31 00:45:55 -07:00
sch_cbq.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_choke.c sch_choke: add choke_skb_cb 2011-02-24 22:11:57 -08:00
sch_drr.c net_sched: accurate bytes/packets stats/rates 2011-01-20 23:31:33 -08:00
sch_dsmark.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_fifo.c net_sched: reduce fifo qdisc size 2011-03-03 11:10:02 -08:00
sch_generic.c net: avoid synchronize_rcu() in dev_deactivate_many 2011-05-22 21:01:20 -04:00
sch_gred.c net_sched: cleanups 2011-01-19 23:31:12 -08:00
sch_hfsc.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_htb.c Fix common misspellings 2011-03-31 11:26:23 -03:00
sch_ingress.c net_sched: factorize qdisc stats handling 2011-01-10 16:07:54 -08:00
sch_mq.c net_sched: TCQ_F_CAN_BYPASS generalization 2011-01-21 16:26:09 -08:00
sch_mqprio.c mqprio: cleanups 2011-02-23 14:11:32 -08:00
sch_multiq.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_netem.c Fix common misspellings 2011-03-31 11:26:23 -03:00
sch_prio.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_qfq.c pkt_sched: QFQ - quick fair queue scheduler 2011-04-04 11:10:24 -07:00
sch_red.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_sfb.c net_sched: SFB flow scheduler 2011-02-23 14:05:11 -08:00
sch_sfq.c inet: constify ip headers and in6_addr 2011-04-22 11:04:14 -07:00
sch_tbf.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00
sch_teql.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-24 14:09:35 -08:00