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authorEric Dumazet <dada1@cosmosbay.com>2009-04-04 16:41:09 -0700
committerDavid S. Miller <davem@davemloft.net>2009-04-04 16:41:09 -0700
commit4e69489a0ac11a9b62a25923975bfc370a30eae5 (patch)
treebdb97a2cd101820d62f580722833aad3b2600f4b /net
parent62994b2d6beb5f7c59a25bf77e01f191acf74ea2 (diff)
downloadlinux-2.6.38-lt-ux500-4e69489a0ac11a9b62a25923975bfc370a30eae5.tar.gz
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>
Diffstat (limited to 'net')
-rw-r--r--net/socket.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/socket.c b/net/socket.c
index 0b14b79c03a..7d5ebc0eb69 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -493,8 +493,7 @@ static struct socket *sock_alloc(void)
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
- get_cpu_var(sockets_in_use)++;
- put_cpu_var(sockets_in_use);
+ percpu_add(sockets_in_use, 1);
return sock;
}
@@ -536,8 +535,7 @@ void sock_release(struct socket *sock)
if (sock->fasync_list)
printk(KERN_ERR "sock_release: fasync list not empty!\n");
- get_cpu_var(sockets_in_use)--;
- put_cpu_var(sockets_in_use);
+ percpu_sub(sockets_in_use, 1);
if (!sock->file) {
iput(SOCK_INODE(sock));
return;