Eric Dumazet a297569fe0 net/udp: do not touch skb->peeked unless really needed ... In UDP recvmsg() path we currently access 3 cache lines from an skb while holding receive queue lock, plus another one if packet is dequeued, since we need to change skb->next->prev 1st cache line (contains ->next/prev pointers, offsets 0x00 and 0x08) 2nd cache line (skb->len & skb->peeked, offsets 0x80 and 0x8e) 3rd cache line (skb->truesize/users, offsets 0xe0 and 0xe4) skb->peeked is only needed to make sure 0-length packets are properly handled while MSG_PEEK is operated. I had first the intent to remove skb->peeked but the "MSG_PEEK at non-zero offset" support added by Sam Kumar makes this not possible. This patch avoids one cache line miss during the locked section, when skb->len and skb->peeked do not have to be read. It also avoids the skb_set_peeked() cost for non empty UDP datagrams. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-12-06 10:41:49 -05:00
..
datagram.c	net/udp: do not touch skb->peeked unless really needed	2016-12-06 10:41:49 -05:00
dev_addr_lists.c	net: fix spelling for synchronized	2014-11-18 15:26:32 -05:00
dev_ioctl.c	dev_ioctl: use sizeof(x) instead of sizeof x	2014-11-18 15:27:32 -05:00
dev.c	bpf, xdp: allow to pass flags to dev_change_xdp_fd	2016-11-30 10:27:20 -05:00
devlink.c	devlink: Add E-Switch inline mode control	2016-11-24 16:01:14 -05:00
drop_monitor.c	genetlink: mark families as __ro_after_init	2016-10-27 16:16:09 -04:00
dst_cache.c	net: dst_cache_per_cpu_dst_set() can be static	2016-03-18 17:45:08 -04:00
dst.c	net: add dst_cache to ovs vxlan lwtunnel	2016-02-16 20:21:48 -05:00
ethtool.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-11-26 23:42:21 -05:00
fib_rules.c	net: core: add missing check for uid_range in rule_exists.	2016-11-09 13:28:10 -05:00
filter.c	bpf: remove type arg from __is_valid_{,xdp_}access	2016-12-05 15:33:10 -05:00
flow_dissector.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-11-26 23:42:21 -05:00
flow.c	flowcache: Increase threshold for refusing new allocations	2016-11-23 06:37:09 +01:00
gen_estimator.c	net_sched: gen_estimator: complete rewrite of rate estimators	2016-12-05 15:21:59 -05:00
gen_stats.c	net_sched: gen_estimator: complete rewrite of rate estimators	2016-12-05 15:21:59 -05:00
hwbm.c	net: hwbm: Fix unbalanced spinlock in error case	2016-05-25 12:35:09 -07:00
link_watch.c	dev: introduce dev_get_iflink()	2015-04-02 14:04:59 -04:00
lwt_bpf.c	bpf: BPF for lightweight tunnel infrastructure	2016-12-02 10:51:49 -05:00
lwtunnel.c	bpf: BPF for lightweight tunnel infrastructure	2016-12-02 10:51:49 -05:00
Makefile	bpf: BPF for lightweight tunnel infrastructure	2016-12-02 10:51:49 -05:00
neighbour.c	neigh: remove duplicate check for same neigh	2016-11-30 13:46:16 -05:00
net_namespace.c	netns: fix net_generic() "id - 1" bloat	2016-12-03 15:59:58 -05:00
net-procfs.c	net: remove NETDEV_TX_LOCKED support	2016-04-26 15:53:05 -04:00
net-sysfs.c	net: Add support for XPS with QoS via traffic classes	2016-10-31 15:00:48 -04:00
net-sysfs.h	net: netdev_kobject_init: annotate with __init	2014-01-05 20:27:54 -05:00
net-traces.c	net: IPv6 fib lookup tracepoint	2015-11-22 11:54:10 -05:00
netclassid_cgroup.c	core: remove unneded headers for net cgroup controllers.	2016-02-17 15:31:27 -05:00
netevent.c	netevent: remove automatic variable in register_netevent_notifier()	2015-05-31 00:03:21 -07:00
netpoll.c	netpoll: more efficient locking	2016-11-16 18:32:02 -05:00
netprio_cgroup.c	core: remove unneded headers for net cgroup controllers.	2016-02-17 15:31:27 -05:00
pktgen.c	netns: make struct pernet_operations::id unsigned int	2016-11-18 10:59:15 -05:00
ptp_classifier.c	ptp: Change ptp_class to a proper bitmask	2015-11-03 11:08:22 -05:00
request_sock.c	tcp: restore fastopen operations	2015-10-05 03:19:06 -07:00
rtnetlink.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-12-03 12:29:53 -05:00
scm.c	unix: correctly track in-flight fds in sending process user_struct	2016-02-08 10:30:42 -05:00
secure_seq.c	tcp: allow to turn tcp timestamp randomization off	2016-12-02 12:49:59 -05:00
skbuff.c	sock: reset sk_err for ICMP packets read from error queue	2016-12-02 10:55:39 -05:00
sock_diag.c	sock_diag: align nlattr properly when needed	2016-04-26 12:00:48 -04:00
sock_reuseport.c	soreuseport: do not export reuseport_add_sock()	2016-10-18 14:18:23 -04:00
sock.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-12-03 12:29:53 -05:00
stream.c	net: fix sleeping for sk_wait_event()	2016-11-14 13:17:21 -05:00
sysctl_net_core.c	bpf: add generic constant blinding for use in jits	2016-05-16 13:49:32 -04:00
timestamping.c	net: skb_defer_rx_timestamp should check for phydev before setting up classify	2015-07-09 14:17:15 -07:00
tso.c	net: tso: add support for IPv6	2015-10-26 22:24:22 -07:00
utils.c	net: the space is required before the open parenthesis '('	2016-06-29 05:15:14 -04:00