AcoSail/kernel_optimize_test
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net: remove zap_completion_queue

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netpoll does an interesting work in zap_completion_queue(), but this was
before we did skb orphaning before delivering packets to device.

It now makes sense to add a test in dev_kfree_skb_irq() to not queue a
skb if already orphaned, and to remove netpoll zap_completion_queue() as
a bonus.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-05-19 23:16:03 +00:00 committed by David S. Miller
parent 27f39c73e6
commit 15e83ed788
2 changed files with 3 additions and 32 deletions
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4
net/core/dev.c
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@ -1577,7 +1577,9 @@ EXPORT_SYMBOL(__netif_schedule);
void dev_kfree_skb_irq(struct sk_buff *skb)
{
if (atomic_dec_and_test(&skb->users)) {
if (!skb->destructor)
dev_kfree_skb(skb);
else if (atomic_dec_and_test(&skb->users)) {
struct softnet_data *sd;
unsigned long flags;

31
net/core/netpoll.c
View File

@ -49,7 +49,6 @@ static atomic_t trapped;
(MAX_UDP_CHUNK + sizeof(struct udphdr) + \
sizeof(struct iphdr) + sizeof(struct ethhdr))
static void zap_completion_queue(void);
static void arp_reply(struct sk_buff *skb);
static unsigned int carrier_timeout = 4;
@ -197,7 +196,6 @@ void netpoll_poll_dev(struct net_device *dev)
service_arp_queue(dev->npinfo);
zap_completion_queue();
}
void netpoll_poll(struct netpoll *np)
@ -221,40 +219,11 @@ static void refill_skbs(void)
spin_unlock_irqrestore(&skb_pool.lock, flags);
}
static void zap_completion_queue(void)
{
unsigned long flags;
struct softnet_data *sd = &get_cpu_var(softnet_data);
if (sd->completion_queue) {
struct sk_buff *clist;
local_irq_save(flags);
clist = sd->completion_queue;
sd->completion_queue = NULL;
local_irq_restore(flags);
while (clist != NULL) {
struct sk_buff *skb = clist;
clist = clist->next;
if (skb->destructor) {
atomic_inc(&skb->users);
dev_kfree_skb_any(skb); /* put this one back */
} else {
__kfree_skb(skb);
}
}
}
put_cpu_var(softnet_data);
}
static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
{
int count = 0;
struct sk_buff *skb;
zap_completion_queue();
refill_skbs();
repeat: