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[AF_UNIX]: Convert to use a spinlock instead of rwlock

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From: Benjamin LaHaise <bcrl@kvack.org>

In af_unix, a rwlock is used to protect internal state.  At least on my 
P4 with HT it is faster to use a spinlock due to the simpler memory 
barrier used to unlock.  This patch raises bw_unix to ~690K/s.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin LaHaise 2006-01-03 14:10:46 -08:00 • committed by David S. Miller
parent 4947d3ef8d
commit fd19f329a3
2 changed files with 6 additions and 6 deletions
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2
net/unix/af_unix.c
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@ -564,7 +564,7 @@ static struct sock * unix_create1(struct socket *sock)
u = unix_sk(sk);
u->dentry = NULL;
u->mnt = NULL;
rwlock_init(&u->lock);
spin_lock_init(&u->lock);
atomic_set(&u->inflight, sock ? 0 : -1);
init_MUTEX(&u->readsem); /* single task reading lock */
init_waitqueue_head(&u->peer_wait);