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openvswitch: change the data type of error status to atomic_long_t 

Change the date type of error status from u64 to atomic_long_t, and use atomic
operation, then remove the lock which is used to protect the error status.

The operation of atomic maybe faster than spin lock.

Cc: Pravin Shelar <pshelar@nicira.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing 2014-09-06 19:06:11 +08:00 committed by David S. Miller
parent 5aaa62d608
commit e403aded79
2 changed files with 12 additions and 23 deletions
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25
net/openvswitch/vport.c
View File

@ -148,8 +148,6 @@ struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
return ERR_PTR(-ENOMEM);
}
spin_lock_init(&vport->stats_lock);
return vport;
}
@ -268,14 +266,10 @@ void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
* netdev-stats can be directly read over netlink-ioctl.
*/
spin_lock_bh(&vport->stats_lock);
stats->rx_errors = vport->err_stats.rx_errors;
stats->tx_errors = vport->err_stats.tx_errors;
stats->tx_dropped = vport->err_stats.tx_dropped;
stats->rx_dropped = vport->err_stats.rx_dropped;
spin_unlock_bh(&vport->stats_lock);
stats->rx_errors = atomic_long_read(&vport->err_stats.rx_errors);
stats->tx_errors = atomic_long_read(&vport->err_stats.tx_errors);
stats->tx_dropped = atomic_long_read(&vport->err_stats.tx_dropped);
stats->rx_dropped = atomic_long_read(&vport->err_stats.rx_dropped);
for_each_possible_cpu(i) {
const struct pcpu_sw_netstats *percpu_stats;
@ -495,27 +489,24 @@ int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
static void ovs_vport_record_error(struct vport *vport,
enum vport_err_type err_type)
{
spin_lock(&vport->stats_lock);
switch (err_type) {
case VPORT_E_RX_DROPPED:
vport->err_stats.rx_dropped++;
atomic_long_inc(&vport->err_stats.rx_dropped);
break;
case VPORT_E_RX_ERROR:
vport->err_stats.rx_errors++;
atomic_long_inc(&vport->err_stats.rx_errors);
break;
case VPORT_E_TX_DROPPED:
vport->err_stats.tx_dropped++;
atomic_long_inc(&vport->err_stats.tx_dropped);
break;
case VPORT_E_TX_ERROR:
vport->err_stats.tx_errors++;
atomic_long_inc(&vport->err_stats.tx_errors);
break;
}
spin_unlock(&vport->stats_lock);
}
static void free_vport_rcu(struct rcu_head *rcu)

10
net/openvswitch/vport.h
View File

@ -62,10 +62,10 @@ int ovs_vport_send(struct vport *, struct sk_buff *);
/* The following definitions are for implementers of vport devices: */
struct vport_err_stats {
u64 rx_dropped;
u64 rx_errors;
u64 tx_dropped;
u64 tx_errors;
atomic_long_t rx_dropped;
atomic_long_t rx_errors;
atomic_long_t tx_dropped;
atomic_long_t tx_errors;
};
/**
* struct vport_portids - array of netlink portids of a vport.
@ -93,7 +93,6 @@ struct vport_portids {
* @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
* @ops: Class structure.
* @percpu_stats: Points to per-CPU statistics used and maintained by vport
* @stats_lock: Protects @err_stats;
* @err_stats: Points to error statistics used and maintained by vport
*/
struct vport {
@ -108,7 +107,6 @@ struct vport {
struct pcpu_sw_netstats __percpu *percpu_stats;
spinlock_t stats_lock;
struct vport_err_stats err_stats;
};