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fa0f5aa743
linux/net
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Eric Dumazet fa0f5aa743 net_sched: qdisc_alloc_handle() can be too slow 
When trying to allocate ~32768 qdiscs using autohandle mechanism, we can
fill the space managed by kernel (handles in [8000-FFFF]:0000 range)

But O(N^2) qdisc_alloc_handle() loops 0x10000 times instead of 0x8000

time tc add qdisc add dev eth0 parent 10:7fff pfifo limit 10
RTNETLINK answers: Cannot allocate memory
real    1m54.826s
user    0m0.000s
sys     0m0.004s

INFO: rcu_sched_state detected stall on CPU 0 (t=60000 jiffies)

Half number of loops, and add a cond_resched() call.
We hold rtnl at this point.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Dave Taht <dave.taht@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-01-03 13:03:20 -05:00
..
9p net/9p: Convert net/9p protocol dumps to tracepoints 2011-10-24 11:13:12 -05:00
802 net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
8021q vlan: static functions 2011-12-14 02:39:30 -05:00
appletalk net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
atm net: Rename dst_get_neighbour{, _raw} to dst_get_neighbour_noref{, _raw}. 2011-12-05 15:20:19 -05:00
ax25 ax25: avoid overflows in ax25_setsockopt() 2011-12-28 14:08:08 -05:00
batman-adv batman-adv: Fix merge error. 2011-12-16 15:07:28 -05:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-23 17:13:56 -05:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-23 17:13:56 -05:00
caif net: fix assignment of 0/1 to bool variables. 2011-12-19 22:27:29 -05:00
can can: remove references to berlios mailinglist 2011-10-17 19:22:46 -04:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2011-12-13 14:59:42 -08:00
core sock_diag: Introduce the meminfo nla core (v2) 2011-12-30 16:42:19 -05:00
dcb net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
dccp module_param: make bool parameters really bool (net & drivers/net) 2011-12-19 22:27:29 -05:00
decnet ipv6: Use universal hash for NDISC. 2011-12-28 15:06:58 -05:00
dns_resolver KEYS: Improve /proc/keys 2011-03-17 11:59:32 +11:00
dsa dsa: Move switch drivers to new directory drivers/net/dsa 2011-11-29 00:21:36 -05:00
econet net: Remove all uses of LL_ALLOCATED_SPACE 2011-11-18 14:37:09 -05:00
ethernet net: don't clear IFF_XMIT_DST_RELEASE in ether_setup 2011-09-15 14:49:44 -04:00
ieee802154 net: Remove all uses of LL_ALLOCATED_SPACE 2011-11-18 14:37:09 -05:00
ipv4 inet_diag: Add the SKMEMINFO extension 2011-12-30 16:42:19 -05:00
ipv6 IPv6: Avoid taking write lock for /proc/net/ipv6_route 2011-12-30 17:07:33 -05:00
ipx net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
irda irda: use msecs_to_jiffies() rather than manual calculation 2011-12-21 15:46:22 -05:00
iucv af_iucv: get rid of state IUCV_SEVERED 2011-12-20 14:05:03 -05:00
key net: use IS_ENABLED(CONFIG_IPV6) 2011-12-11 18:25:16 -05:00
l2tp l2tp: ensure sk->dst is still valid 2011-11-26 15:57:36 -05:00
lapb wan: make LAPB callbacks const 2011-09-16 19:20:20 -04:00
llc llc: llc_cmsg_rcv was getting called after sk_eat_skb. 2011-12-19 15:58:52 -05:00
mac80211 net: fix assignment of 0/1 to bool variables. 2011-12-19 22:27:29 -05:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-01-02 18:56:49 -05:00
netlabel net: use IS_ENABLED(CONFIG_IPV6) 2011-12-11 18:25:16 -05:00
netlink genetlink: add auto module loading 2011-12-28 13:48:55 -05:00
netrom netrom: avoid overflows in nr_setsockopt() 2011-12-28 14:08:08 -05:00
nfc Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2011-12-15 13:47:58 -05:00
openvswitch openvswitch: small potential memory leak in ovs_vport_alloc() 2011-12-06 12:58:57 -05:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-30 13:04:14 -05:00
phonet Phonet: set the pipe handle using setsockopt 2011-11-18 14:37:40 -05:00
rds rds: drop "select LLIST" 2011-11-14 00:10:50 -05:00
rfkill net: fix assignment of 0/1 to bool variables. 2011-12-19 22:27:29 -05:00
rose net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
rxrpc net: fix assignment of 0/1 to bool variables. 2011-12-19 22:27:29 -05:00
sched net_sched: qdisc_alloc_handle() can be too slow 2012-01-03 13:03:20 -05:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-23 17:13:56 -05:00
sunrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-23 17:13:56 -05:00
tipc tipc: rename struct bearer_name to struct tipc_bearer_names 2011-12-29 21:53:30 -05:00
unix unix_diag: Fixup RQLEN extension report 2011-12-30 16:46:02 -05:00
wanrouter wanrouter: Remove kernel_lock annotations 2011-11-07 13:27:30 -05:00
wimax net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
wireless cfg80211: Restore orig channel values upon disconnect 2011-12-16 09:30:43 -05:00
x25 net:x25: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-12-23 17:13:56 -05:00
compat.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
Kconfig net: Add Open vSwitch kernel components. 2011-12-03 09:35:17 -08:00
Makefile net: Add Open vSwitch kernel components. 2011-12-03 09:35:17 -08:00
nonet.c
socket.c net: add network priority cgroup infrastructure (v4) 2011-11-22 15:22:23 -05:00
sysctl_net.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00