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4e69489a0a
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Eric Dumazet 4e69489a0a socket: use percpu_add() while updating sockets_in_use 
sock_alloc() currently uses following code to update sockets_in_use

get_cpu_var(sockets_in_use)++;
put_cpu_var(sockets_in_use);

This translates to :

c0436274:       b8 01 00 00 00          mov    $0x1,%eax
c0436279:       e8 42 40 df ff          call   c022a2c0 <add_preempt_count>
c043627e:       bb 20 4f 6a c0          mov    $0xc06a4f20,%ebx
c0436283:       e8 18 ca f0 ff          call   c0342ca0 <debug_smp_processor_id>
c0436288:       03 1c 85 60 4a 65 c0    add    -0x3f9ab5a0(,%eax,4),%ebx
c043628f:       ff 03                   incl   (%ebx)
c0436291:       b8 01 00 00 00          mov    $0x1,%eax
c0436296:       e8 75 3f df ff          call   c022a210 <sub_preempt_count>
c043629b:       89 e0                   mov    %esp,%eax
c043629d:       25 00 e0 ff ff          and    $0xffffe000,%eax
c04362a2:       f6 40 08 08             testb  $0x8,0x8(%eax)
c04362a6:       75 07                   jne    c04362af <sock_alloc+0x7f>
c04362a8:       8d 46 d8                lea    -0x28(%esi),%eax
c04362ab:       5b                      pop    %ebx
c04362ac:       5e                      pop    %esi
c04362ad:       c9                      leave
c04362ae:       c3                      ret
c04362af:       e8 cc 5d 09 00          call   c04cc080 <preempt_schedule>
c04362b4:       8d 74 26 00             lea    0x0(%esi,%eiz,1),%esi
c04362b8:       eb ee                   jmp    c04362a8 <sock_alloc+0x78>

While percpu_add(sockets_in_use, 1) translates to a single instruction :

c0436275:   64 83 05 20 5f 6a c0    addl   $0x1,%fs:0xc06a5f20

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-04 16:41:09 -07:00
..
9p 9p: fix sparse warning: cast adds address space 2009-02-26 23:13:32 -08:00
802 snap: use const for descriptor 2009-03-21 19:06:50 -07:00
8021q gro: Fix vlan/netpoll check again 2009-03-17 13:10:52 -07:00
appletalk appletalk: this warning can go I think 2009-03-27 00:27:18 -07:00
atm atm: convert clip driver to net_device_ops 2009-03-21 19:19:12 -07:00
ax25 Revert "ax25: zero length frame filtering in AX25" 2009-03-27 17:23:42 -07:00
bluetooth Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-03-26 15:23:24 -07:00
bridge Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-03-26 01:22:01 -07:00
can can: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:35 -08:00
core net: allow multiple dev per napi with GRO 2009-04-02 01:07:37 -07:00
dcb
dccp dccp: Do not let initial option overhead shrink the MPS 2009-03-02 03:07:23 -08:00
decnet net/*: use linux/kernel.h swap() 2009-03-21 13:36:17 -07:00
dsa dsa: add switch chip cascading support 2009-03-21 19:06:54 -07:00
econet net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
ethernet
ipv4 tcp: miscounts due to tcp_fragment pcount reset 2009-04-02 16:31:45 -07:00
ipv6 netfilter: use rcu_read_bh() in ipt_do_table() 2009-04-02 00:54:43 -07:00
ipx ipx: use constant for strings and desciptor 2009-03-21 19:06:51 -07:00
irda irlan: convert to net_device_ops 2009-03-21 19:19:16 -07:00
iucv iucv: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:37 -08:00
key af_key: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:32 -08:00
lapb
llc net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
mac80211 mac80211/iwlwifi: move virtual A-MDPU queue bookkeeping to iwlwifi 2009-03-27 20:13:23 -04:00
netfilter netfilter: xtables: fix IPv6 dependency in the cluster match 2009-03-29 13:46:01 -07:00
netlabel
netlink Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-03-26 15:23:24 -07:00
netrom Revert "netrom: zero length frame filtering in NetRom" 2009-03-27 17:22:55 -07:00
packet Network Drop Monitor: Adding kfree_skb_clean for non-drops and modifying end-of-line points for skbs 2009-03-13 12:09:28 -07:00
phonet net: convert usage of packet_type to read_mostly 2009-03-10 05:22:43 -07:00
rds RDS: Use spinlock to protect 64b value update on 32b archs 2009-04-02 00:52:22 -07:00
rfkill
rose af_rose/x25: Sanity check the maximum user frame size 2009-03-27 00:28:21 -07:00
rxrpc
sched net/*: use linux/kernel.h swap() 2009-03-21 13:36:17 -07:00
sctp sctp: Clean up TEST_FRAME hacks. 2009-03-21 13:41:09 -07:00
sunrpc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-03-27 16:23:12 -07:00
tipc tipc: fix non-const printf format arguments 2009-03-18 19:11:29 -07:00
unix unix: remove some pointless conditionals before kfree_skb() 2009-02-26 23:07:34 -08:00
wanrouter wanrouter: fix sparse warnings: context imbalance 2009-02-26 23:13:36 -08:00
wimax Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-02-14 23:12:00 -08:00
wireless cfg80211: default CONFIG_WIRELESS_OLD_REGULATORY to n 2009-03-27 20:13:23 -04:00
x25 af_rose/x25: Sanity check the maximum user frame size 2009-03-27 00:28:21 -07:00
xfrm xfrm: spin_lock() should be spin_unlock() in xfrm_state.c 2009-03-27 00:23:04 -07:00
compat.c net: socket infrastructure for SO_TIMESTAMPING 2009-02-15 22:43:35 -08:00
Kconfig Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-03-26 15:23:24 -07:00
Makefile RDS: Kconfig and Makefile 2009-02-26 23:43:35 -08:00
nonet.c
socket.c socket: use percpu_add() while updating sockets_in_use 2009-04-04 16:41:09 -07:00
sysctl_net.c net: sysctl_net - use net_eq to compare nets 2009-03-16 16:23:30 +01:00
TUNABLE