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Eric Dumazet b2111724a6 net: use per task frag allocator in skb_append_datato_frags 
Use the new per task frag allocator in skb_append_datato_frags(),
to reduce number of frags and page allocator overhead.

Tested:
 ifconfig lo mtu 16436
 perf record netperf -t UDP_STREAM ; perf report

before :
 Throughput: 32928 Mbit/s
    51.79%  netperf  [kernel.kallsyms]  [k] copy_user_generic_string
     5.98%  netperf  [kernel.kallsyms]  [k] __alloc_pages_nodemask
     5.58%  netperf  [kernel.kallsyms]  [k] get_page_from_freelist
     5.01%  netperf  [kernel.kallsyms]  [k] __rmqueue
     3.74%  netperf  [kernel.kallsyms]  [k] skb_append_datato_frags
     1.87%  netperf  [kernel.kallsyms]  [k] prep_new_page
     1.42%  netperf  [kernel.kallsyms]  [k] next_zones_zonelist
     1.28%  netperf  [kernel.kallsyms]  [k] __inc_zone_state
     1.26%  netperf  [kernel.kallsyms]  [k] alloc_pages_current
     0.78%  netperf  [kernel.kallsyms]  [k] sock_alloc_send_pskb
     0.74%  netperf  [kernel.kallsyms]  [k] udp_sendmsg
     0.72%  netperf  [kernel.kallsyms]  [k] zone_watermark_ok
     0.68%  netperf  [kernel.kallsyms]  [k] __cpuset_node_allowed_softwall
     0.67%  netperf  [kernel.kallsyms]  [k] fib_table_lookup
     0.60%  netperf  [kernel.kallsyms]  [k] memcpy_fromiovecend
     0.55%  netperf  [kernel.kallsyms]  [k] __udp4_lib_lookup

 after:
  Throughput: 47185 Mbit/s
	61.74%	netperf  [kernel.kallsyms]	[k] copy_user_generic_string
	 2.07%	netperf  [kernel.kallsyms]	[k] prep_new_page
	 1.98%	netperf  [kernel.kallsyms]	[k] skb_append_datato_frags
	 1.02%	netperf  [kernel.kallsyms]	[k] sock_alloc_send_pskb
	 0.97%	netperf  [kernel.kallsyms]	[k] enqueue_task_fair
	 0.97%	netperf  [kernel.kallsyms]	[k] udp_sendmsg
	 0.91%	netperf  [kernel.kallsyms]	[k] __ip_route_output_key
	 0.88%	netperf  [kernel.kallsyms]	[k] __netif_receive_skb
	 0.87%	netperf  [kernel.kallsyms]	[k] fib_table_lookup
	 0.85%	netperf  [kernel.kallsyms]	[k] resched_task
	 0.78%	netperf  [kernel.kallsyms]	[k] __udp4_lib_lookup
	 0.77%	netperf  [kernel.kallsyms]	[k] _raw_spin_lock_irqsave

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-28 15:25:19 -08:00
..
datagram.c net: skb_free_datagram_locked() doesnt drop all packets 2012-06-27 15:40:57 -07:00
dev.c net: add change_carrier netdev op 2012-12-28 15:24:18 -08:00
dev_addr_lists.c net: correct check in dev_addr_del() 2012-11-15 17:57:53 -05:00
drop_monitor.c drop_monitor: dont sleep in atomic context 2012-06-04 11:42:01 -04:00
dst.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-10-02 13:38:27 -07:00
ethtool.c net: Allow userns root control of the core of the network stack. 2012-11-18 20:32:45 -05:00
fib_rules.c net: Enable a userns root rtnl calls that are safe for unprivilged users 2012-11-18 20:33:36 -05:00
filter.c sk-filter: Add ability to get socket filter program (v2) 2012-11-01 11:17:15 -04:00
flow.c net: core: use this_cpu_ptr per-cpu helper 2012-11-19 18:59:44 -05:00
flow_dissector.c ipv6: add ipv6_addr_hash() helper 2012-07-18 11:28:46 -07:00
gen_estimator.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
gen_stats.c gen_stats: Stop using NLA_PUT*(). 2012-04-02 04:33:44 -04:00
iovec.c net: get rid of some pointless casts to sockaddr 2012-03-11 19:11:22 -07:00
link_watch.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-10-02 13:38:27 -07:00
Makefile sock_diag: Move the sock_ code to net/core/ 2011-12-06 13:58:02 -05:00
neighbour.c net: fix some compiler warning in net/core/neighbour.c 2012-12-05 21:50:37 -05:00
net-sysfs.c net: allow to change carrier via sysfs 2012-12-28 15:24:18 -08:00
net-sysfs.h
net-traces.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
net_namespace.c userns: Require CAP_SYS_ADMIN for most uses of setns. 2012-12-14 16:12:03 -08:00
netevent.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
netpoll.c net: remove obsolete simple_strto<foo> 2012-12-11 12:49:53 -05:00
netprio_cgroup.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-12-12 18:07:07 -08:00
pktgen.c pktgen: clean up ktime_t helpers 2012-11-03 14:50:15 -04:00
request_sock.c tcp: TCP Fast Open Server - support TFO listeners 2012-08-31 20:02:19 -04:00
rtnetlink.c rtnl: expose carrier value with possibility to set it 2012-12-28 15:24:18 -08:00
scm.c net: Allow userns root to force the scm creds 2012-11-18 20:32:45 -05:00
secure_seq.c netfilter: ipv6: add IPv6 NAT support 2012-08-30 03:00:17 +02:00
skbuff.c net: use per task frag allocator in skb_append_datato_frags 2012-12-28 15:25:19 -08:00
sock.c net: devnet_rename_seq should be a seqcount 2012-12-21 13:14:01 -08:00
sock_diag.c netlink: hide struct module parameter in netlink_kernel_create 2012-09-08 18:46:30 -04:00
stream.c
sysctl_net_core.c net: Don't export sysctls to unprivileged users 2012-11-18 20:30:55 -05:00
timestamping.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
user_dma.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
utils.c net: add doc for in4_pton() 2012-10-12 13:56:52 -04:00