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net_sched: sch_fq: avoid calling ktime_get_ns() if not needed 

There are two cases were we can avoid calling ktime_get_ns() :

1) Queue is empty.
2) Internal queue is not empty.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-11-19 17:30:19 -08:00 committed by David S. Miller
parent 6133e78f41
commit 6b015a523f
1 changed files with 6 additions and 1 deletions
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7
net/sched/sch_fq.c
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@ -414,16 +414,21 @@ static void fq_check_throttled(struct fq_sched_data *q, u64 now)
static struct sk_buff *fq_dequeue(struct Qdisc *sch)
{
struct fq_sched_data *q = qdisc_priv(sch);
u64 now = ktime_get_ns();
struct fq_flow_head *head;
struct sk_buff *skb;
struct fq_flow *f;
unsigned long rate;
u32 plen;
u64 now;
if (!sch->q.qlen)
return NULL;
skb = fq_dequeue_head(sch, &q->internal);
if (skb)
goto out;
now = ktime_get_ns();
fq_check_throttled(q, now);
begin:
head = &q->new_flows;