Arnaldo Carvalho de Melo a écrit :
On 3/6/06, David S. Miller <[EMAIL PROTECTED]> wrote:
From: Benjamin LaHaise <[EMAIL PROTECTED]>
Date: Mon, 6 Mar 2006 15:06:41 -0800
This patch removes a couple of memory barriers from atomic bitops that
showed up on profiles of netperf.
A little ugly, we should have a nicer way to do this
generically.
/* This should be in poll */
- clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
+ if (test_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
+ clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
Something like fast_clear_bit() that does the above sequence in a inline
function?
I'm not even sure this 'optimization' is valid on UP.
Eric
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