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rds: switch to rwlock on bind_lock

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The bind_lock is almost entirely readonly, but it gets
hammered during normal operations and is a major bottleneck.

This commit changes it to an rwlock, which takes it from 80%
of the system time on a big numa machine down to much lower
numbers.

A better fix would involve RCU, which is done in a later commit

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2010-04-21 13:04:43 -07:00 committed by Andy Grover
parent ce47f52f42
commit 976673ee1b
1 changed files with 7 additions and 7 deletions
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14
net/rds/bind.c
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@ -43,7 +43,7 @@
* This is now called for every incoming frame so we arguably care much more
* about it than we used to.
*/
static DEFINE_SPINLOCK(rds_bind_lock);
static DEFINE_RWLOCK(rds_bind_lock);
static struct rb_root rds_bind_tree = RB_ROOT;
static struct rds_sock *rds_bind_tree_walk(__be32 addr, __be16 port,
@ -88,13 +88,13 @@ struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
struct rds_sock *rs;
unsigned long flags;
spin_lock_irqsave(&rds_bind_lock, flags);
read_lock_irqsave(&rds_bind_lock, flags);
rs = rds_bind_tree_walk(addr, port, NULL);
if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
rds_sock_addref(rs);
else
rs = NULL;
spin_unlock_irqrestore(&rds_bind_lock, flags);
read_unlock_irqrestore(&rds_bind_lock, flags);
rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
ntohs(port));
@ -116,7 +116,7 @@ static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
last = rover - 1;
}
spin_lock_irqsave(&rds_bind_lock, flags);
write_lock_irqsave(&rds_bind_lock, flags);
do {
if (rover == 0)
@ -137,7 +137,7 @@ static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
rs, &addr, (int)ntohs(*port));
}
spin_unlock_irqrestore(&rds_bind_lock, flags);
write_unlock_irqrestore(&rds_bind_lock, flags);
return ret;
}
@ -146,7 +146,7 @@ void rds_remove_bound(struct rds_sock *rs)
{
unsigned long flags;
spin_lock_irqsave(&rds_bind_lock, flags);
write_lock_irqsave(&rds_bind_lock, flags);
if (rs->rs_bound_addr) {
rdsdebug("rs %p unbinding from %pI4:%d\n",
@ -158,7 +158,7 @@ void rds_remove_bound(struct rds_sock *rs)
rs->rs_bound_addr = 0;
}
spin_unlock_irqrestore(&rds_bind_lock, flags);
write_unlock_irqrestore(&rds_bind_lock, flags);
}
int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)