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net_sched: add qdisc_watchdog_schedule_range_ns()

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Some packet schedulers might want to add a slack
when programming hrtimers. This can reduce number
of interrupts and increase batch sizes and thus
give good xmit_more savings.

This commit adds qdisc_watchdog_schedule_range_ns()
helper, with an extra delta_ns parameter.

Legacy qdisc_watchdog_schedule_n() becomes an inline
passing a zero slack.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2020-03-16 19:12:49 -07:00 committed by David S. Miller
parent 24ee86511b
commit efe074c2cc
2 changed files with 16 additions and 6 deletions
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10
include/net/pkt_sched.h
View File

@ -75,7 +75,15 @@ struct qdisc_watchdog {
void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
clockid_t clockid);
void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
u64 delta_ns);
static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
u64 expires)
{
return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
}
static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
psched_time_t expires)

12
net/sched/sch_api.c
View File

@ -618,7 +618,8 @@ void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
}
EXPORT_SYMBOL(qdisc_watchdog_init);
void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
u64 delta_ns)
{
if (test_bit(__QDISC_STATE_DEACTIVATED,
&qdisc_root_sleeping(wd->qdisc)->state))
@ -628,11 +629,12 @@ void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
return;
wd->last_expires = expires;
hrtimer_start(&wd->timer,
ns_to_ktime(expires),
HRTIMER_MODE_ABS_PINNED);
hrtimer_start_range_ns(&wd->timer,
ns_to_ktime(expires),
delta_ns,
HRTIMER_MODE_ABS_PINNED);
}
EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
EXPORT_SYMBOL(qdisc_watchdog_schedule_range_ns);
void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{