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RDS: make socket bind/release locking scheme simple and more efficient 

RDS bind and release locking scheme is very inefficient. It
uses RCU for maintaining the bind hash-table which is great but
it also needs to hold spinlock for [add/remove]_bound(). So
overall usecase, the hash-table concurrent speedup doesn't pay off.
In fact blocking nature of synchronize_rcu() makes the RDS
socket shutdown too slow which hurts RDS performance since
connection shutdown and re-connect happens quite often to
maintain the RC part of the protocol.

So we make the locking scheme simpler and more efficient by
replacing spin_locks with reader/writer locks and getting rid
off rcu for bind hash-table.

In subsequent patch, we also covert the global lock with per-bucket
lock to reduce the global lock contention.

Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
This commit is contained in:
Santosh Shilimkar 2012-02-03 11:09:23 -05:00 committed by Santosh Shilimkar
parent 59fe460674
commit 8b0a6b461e
2 changed files with 15 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
net/rds/af_rds.c
View File

@ -72,13 +72,7 @@ static int rds_release(struct socket *sock)
rds_clear_recv_queue(rs);
rds_cong_remove_socket(rs);
/*
* the binding lookup hash uses rcu, we need to
* make sure we synchronize_rcu before we free our
* entry
*/
rds_remove_bound(rs);
synchronize_rcu();
rds_send_drop_to(rs, NULL);
rds_rdma_drop_keys(rs);

35
net/rds/bind.c
View File

@ -40,7 +40,7 @@
#define BIND_HASH_SIZE 1024
static struct hlist_head bind_hash_table[BIND_HASH_SIZE];
static DEFINE_SPINLOCK(rds_bind_lock);
static DEFINE_RWLOCK(rds_bind_lock);
static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
{
@ -48,6 +48,7 @@ static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
(BIND_HASH_SIZE - 1));
}
/* must hold either read or write lock (write lock for insert != NULL) */
static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
struct rds_sock *insert)
{
@ -56,30 +57,24 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
u64 cmp;
u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port);
rcu_read_lock();
hlist_for_each_entry_rcu(rs, head, rs_bound_node) {
hlist_for_each_entry(rs, head, rs_bound_node) {
cmp = ((u64)be32_to_cpu(rs->rs_bound_addr) << 32) |
be16_to_cpu(rs->rs_bound_port);
if (cmp == needle) {
rcu_read_unlock();
if (cmp == needle)
return rs;
}
}
rcu_read_unlock();
if (insert) {
/*
* make sure our addr and port are set before
* we are added to the list, other people
* in rcu will find us as soon as the
* hlist_add_head_rcu is done
* we are added to the list.
*/
insert->rs_bound_addr = addr;
insert->rs_bound_port = port;
rds_sock_addref(insert);
hlist_add_head_rcu(&insert->rs_bound_node, head);
hlist_add_head(&insert->rs_bound_node, head);
}
return NULL;
}
@ -93,8 +88,11 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
{
struct rds_sock *rs;
unsigned long flags;
read_lock_irqsave(&rds_bind_lock, flags);
rs = rds_bind_lookup(addr, port, NULL);
read_unlock_irqrestore(&rds_bind_lock, flags);
if (rs && !sock_flag(rds_rs_to_sk(rs), SOCK_DEAD))
rds_sock_addref(rs);
@ -103,6 +101,7 @@ struct rds_sock *rds_find_bound(__be32 addr, __be16 port)
rdsdebug("returning rs %p for %pI4:%u\n", rs, &addr,
ntohs(port));
return rs;
}
@ -121,7 +120,7 @@ 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)
@ -135,7 +134,7 @@ static int rds_add_bound(struct rds_sock *rs, __be32 addr, __be16 *port)
}
} while (rover++ != last);
spin_unlock_irqrestore(&rds_bind_lock, flags);
write_unlock_irqrestore(&rds_bind_lock, flags);
return ret;
}
@ -144,19 +143,19 @@ 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",
rs, &rs->rs_bound_addr,
ntohs(rs->rs_bound_port));
hlist_del_init_rcu(&rs->rs_bound_node);
hlist_del_init(&rs->rs_bound_node);
rds_sock_put(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)
@ -200,9 +199,5 @@ int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
out:
release_sock(sk);
/* we might have called rds_remove_bound on error */
if (ret)
synchronize_rcu();
return ret;
}