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d35c99ff77
linux/net
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Eric Dumazet d35c99ff77 netlink: do not enter direct reclaim from netlink_dump() 
Since linux-3.15, netlink_dump() can use up to 16384 bytes skb
allocations.

Due to struct skb_shared_info ~320 bytes overhead, we end up using
order-3 (on x86) page allocations, that might trigger direct reclaim and
add stress.

The intent was really to attempt a large allocation but immediately
fallback to a smaller one (order-1 on x86) in case of memory stress.

On recent kernels (linux-4.4), we can remove __GFP_DIRECT_RECLAIM to
meet the goal. Old kernels would need to remove __GFP_WAIT

While we are at it, since we do an order-3 allocation, allow to use
all the allocated bytes instead of 16384 to reduce syscalls during
large dumps.

iproute2 already uses 32KB recvmsg() buffer sizes.

Alexei provided an initial patch downsizing to SKB_WITH_OVERHEAD(16384)

Fixes: 9063e21fb0 ("netlink: autosize skb lengthes")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Alexei Starovoitov <ast@kernel.org>
Cc: Greg Thelen <gthelen@google.com>
Reviewed-by: Greg Rose <grose@lightfleet.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-06 20:53:13 -04:00
..
6lowpan 6lowpan: ndisc: no overreact if no short address is available 2016-09-19 20:19:34 +02:00
9p 9p/trans_virtio: use kvfree() for iov_iter_get_pages_alloc() 2016-08-09 13:42:36 +03:00
802
8021q net: remove type_check from dev_get_nest_level() 2016-08-13 15:15:54 -07:00
appletalk appletalk: use IS_ENABLED() instead of checking for built-in or module 2016-09-10 21:19:10 -07:00
atm lec: use IS_ENABLED() instead of checking for built-in or module 2016-09-10 21:19:10 -07:00
ax25
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-09-23 06:46:57 -04:00
bluetooth Bluetooth: Fix not updating scan rsp when adv off 2016-09-22 17:48:23 +02:00
bridge netfilter: bridge: clarify bridge/netfilter message 2016-10-02 22:44:03 -04:00
caif
can
ceph libceph: using kfree_rcu() to simplify the code 2016-08-08 21:41:42 +02:00
core Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-10-06 09:52:23 -07:00
dcb
dccp Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2016-07-29 17:38:46 -07:00
decnet net: fix decnet rtnexthop parsing 2016-07-05 14:08:47 -07:00
dns_resolver
dsa net: dsa: add port fast ageing 2016-09-23 08:38:50 -04:00
ethernet
hsr
ieee802154 ieee802154: 6lowpan: fix intra pan id check 2016-07-08 13:23:12 +02:00
ipv4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-02 22:20:41 -04:00
ipv6 ipv6 addrconf: remove addrconf_sysctl_hop_limit() 2016-10-02 23:48:13 -04:00
ipx
irda Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-09-23 06:46:57 -04:00
iucv Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2016-07-29 17:38:46 -07:00
kcm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-09-12 15:52:44 -07:00
key
l2tp l2tp: constify net_device_ops structures 2016-09-17 10:07:23 -04:00
l3mdev net: ipv6: Remove l3mdev_get_saddr6 2016-09-10 23:12:53 -07:00
lapb
llc llc: switch type to bool as the timeout is only tested versus 0 2016-09-17 10:05:05 -04:00
mac80211 Merge remote-tracking branch 'net-next/master' into mac80211-next 2016-10-04 09:46:44 +02:00
mac802154 mac802154: use rate limited warnings for malformed frames 2016-09-19 20:19:34 +02:00
mpls mpls: move mpls_hdr to a common location 2016-10-03 02:00:21 -04:00
ncsi net/ncsi: Introduce ncsi_stop_dev() 2016-10-04 02:11:51 -04:00
netfilter netfilter: nft_limit: fix divided by zero panic 2016-10-04 08:59:03 +02:00
netlabel
netlink netlink: do not enter direct reclaim from netlink_dump() 2016-10-06 20:53:13 -04:00
netrom
nfc NFC: digital: Fix RTOX supervisor PDU handling 2016-07-11 02:02:03 +02:00
openvswitch openvswitch: use mpls_hdr 2016-10-03 02:00:22 -04:00
packet packet: call fanout_release, while UNREGISTERING a netdev 2016-10-06 20:50:18 -04:00
phonet
qrtr
rds RDS: add __printf format attribute to error reporting functions 2016-08-08 16:16:21 -07:00
rfkill
rose rose: limit sk_filter trim to payload 2016-07-13 11:53:40 -07:00
rxrpc rxrpc: Fix the call timer handling 2016-09-30 14:40:11 +01:00
sched net/sched: act_vlan: Push skb->data to mac_header prior calling skb_vlan_*() functions 2016-10-03 21:40:50 -04:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-10-02 22:20:41 -04:00
strparser kcm: Remove TCP specific references from kcm and strparser 2016-08-28 23:32:41 -04:00
sunrpc Fix a memory corruption bug that I introduced in 4.7. 2016-09-16 17:00:26 -07:00
switchdev switchdev: remove FIB offload infrastructure 2016-09-28 04:48:00 -04:00
tipc tipc: fix possible memory leak in tipc_udp_enable() 2016-09-13 11:28:32 -04:00
unix af_unix: split 'u->readlock' into two: 'iolock' and 'bindlock' 2016-09-04 13:29:29 -07:00
vmw_vsock VSOCK: Don't dec ack backlog twice for rejected connections 2016-09-27 07:59:25 -04:00
wimax
wireless Merge remote-tracking branch 'net-next/master' into mac80211-next 2016-10-04 09:46:44 +02:00
x25 net: x25: remove null checks on arrays calling_ae and called_ae 2016-09-09 18:13:30 -07:00
xfrm proc: Reduce cache miss in xfrm_statistics_seq_show 2016-09-30 01:50:45 -04:00
compat.c
Kconfig strparser: Stream parser for messages 2016-08-17 19:36:23 -04:00
Makefile strparser: Stream parser for messages 2016-08-17 19:36:23 -04:00
socket.c
sysctl_net.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2016-10-06 09:52:23 -07:00