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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>
This commit is contained in:
Eric Dumazet 2009-04-04 16:41:09 -07:00 committed by David S. Miller
parent 62994b2d6b
commit 4e69489a0a
1 changed files with 2 additions and 4 deletions
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6
net/socket.c
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@ -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;