Commit efe074c2 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net_sched: add qdisc_watchdog_schedule_range_ns() 



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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 24ee8651

include/net/pkt_sched.h

+9 −1
Original line number Diff line number Diff line
@@ -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)

net/sched/sch_api.c

+7 −5
Original line number Diff line number Diff line
@@ -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,

	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)

{

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