time: tick-sched: Split tick_nohz_stop_sched_tick()
In order to address the issue with short idle duration predictions by the idle governor after the scheduler tick has been stopped, split tick_nohz_stop_sched_tick() into two separate routines, one computing the time to the next timer event and the other simply stopping the tick when the time to the next timer event is known. Prepare these two routines to be called separately, as one of them will be called by the idle governor in the cpuidle_select() code path after subsequent changes. Update the former callers of tick_nohz_stop_sched_tick() to use the new routines, tick_nohz_next_event() and tick_nohz_stop_tick(), instead of it and move the updates of the sleep_length field in struct tick_sched into __tick_nohz_idle_stop_tick() as it doesn't need to be updated anywhere else. There should be no intentional visible changes in functionality resulting from this change. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Rafael J. Wysocki
Родитель
45f1ff59e2
Коммит
23a8d88810
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@ -641,13 +641,10 @@ static inline bool local_timer_softirq_pending(void)
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return local_softirq_pending() & TIMER_SOFTIRQ;
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}
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static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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ktime_t now, int cpu)
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static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu)
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{
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struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
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u64 basemono, next_tick, next_tmr, next_rcu, delta, expires;
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unsigned long seq, basejiff;
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ktime_t tick;
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/* Read jiffies and the time when jiffies were updated last */
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do {
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@ -656,6 +653,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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basejiff = jiffies;
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} while (read_seqretry(&jiffies_lock, seq));
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ts->last_jiffies = basejiff;
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ts->timer_expires_base = basemono;
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/*
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* Keep the periodic tick, when RCU, architecture or irq_work
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@ -700,32 +698,20 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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* next period, so no point in stopping it either, bail.
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*/
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if (!ts->tick_stopped) {
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tick = 0;
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ts->timer_expires = 0;
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goto out;
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}
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}
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/*
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* If this CPU is the one which updates jiffies, then give up
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* the assignment and let it be taken by the CPU which runs
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* the tick timer next, which might be this CPU as well. If we
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* don't drop this here the jiffies might be stale and
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* do_timer() never invoked. Keep track of the fact that it
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* was the one which had the do_timer() duty last. If this CPU
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* is the one which had the do_timer() duty last, we limit the
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* sleep time to the timekeeping max_deferment value.
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* If this CPU is the one which had the do_timer() duty last, we limit
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* the sleep time to the timekeeping max_deferment value.
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* Otherwise we can sleep as long as we want.
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*/
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delta = timekeeping_max_deferment();
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if (cpu == tick_do_timer_cpu) {
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tick_do_timer_cpu = TICK_DO_TIMER_NONE;
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ts->do_timer_last = 1;
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} else if (tick_do_timer_cpu != TICK_DO_TIMER_NONE) {
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if (cpu != tick_do_timer_cpu &&
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(tick_do_timer_cpu != TICK_DO_TIMER_NONE || !ts->do_timer_last))
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delta = KTIME_MAX;
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ts->do_timer_last = 0;
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} else if (!ts->do_timer_last) {
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delta = KTIME_MAX;
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}
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/* Calculate the next expiry time */
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if (delta < (KTIME_MAX - basemono))
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@ -733,14 +719,42 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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else
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expires = KTIME_MAX;
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expires = min_t(u64, expires, next_tick);
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tick = expires;
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ts->timer_expires = min_t(u64, expires, next_tick);
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out:
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return ts->timer_expires;
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}
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static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)
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{
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struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
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u64 basemono = ts->timer_expires_base;
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u64 expires = ts->timer_expires;
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ktime_t tick = expires;
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/* Make sure we won't be trying to stop it twice in a row. */
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ts->timer_expires_base = 0;
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/*
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* If this CPU is the one which updates jiffies, then give up
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* the assignment and let it be taken by the CPU which runs
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* the tick timer next, which might be this CPU as well. If we
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* don't drop this here the jiffies might be stale and
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* do_timer() never invoked. Keep track of the fact that it
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* was the one which had the do_timer() duty last.
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*/
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if (cpu == tick_do_timer_cpu) {
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tick_do_timer_cpu = TICK_DO_TIMER_NONE;
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ts->do_timer_last = 1;
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} else if (tick_do_timer_cpu != TICK_DO_TIMER_NONE) {
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ts->do_timer_last = 0;
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}
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/* Skip reprogram of event if its not changed */
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if (ts->tick_stopped && (expires == ts->next_tick)) {
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/* Sanity check: make sure clockevent is actually programmed */
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if (tick == KTIME_MAX || ts->next_tick == hrtimer_get_expires(&ts->sched_timer))
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goto out;
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return;
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WARN_ON_ONCE(1);
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printk_once("basemono: %llu ts->next_tick: %llu dev->next_event: %llu timer->active: %d timer->expires: %llu\n",
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@ -774,7 +788,7 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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if (unlikely(expires == KTIME_MAX)) {
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if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
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hrtimer_cancel(&ts->sched_timer);
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goto out;
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return;
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}
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hrtimer_set_expires(&ts->sched_timer, tick);
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@ -783,15 +797,23 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
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hrtimer_start_expires(&ts->sched_timer, HRTIMER_MODE_ABS_PINNED);
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else
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tick_program_event(tick, 1);
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out:
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/*
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* Update the estimated sleep length until the next timer
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* (not only the tick).
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*/
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ts->sleep_length = ktime_sub(dev->next_event, now);
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return tick;
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}
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static void tick_nohz_retain_tick(struct tick_sched *ts)
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{
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ts->timer_expires_base = 0;
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}
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#ifdef CONFIG_NO_HZ_FULL
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static void tick_nohz_stop_sched_tick(struct tick_sched *ts, int cpu)
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{
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if (tick_nohz_next_event(ts, cpu))
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tick_nohz_stop_tick(ts, cpu);
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else
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tick_nohz_retain_tick(ts);
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}
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#endif /* CONFIG_NO_HZ_FULL */
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static void tick_nohz_restart_sched_tick(struct tick_sched *ts, ktime_t now)
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{
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/* Update jiffies first */
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@ -827,7 +849,7 @@ static void tick_nohz_full_update_tick(struct tick_sched *ts)
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return;
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if (can_stop_full_tick(cpu, ts))
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tick_nohz_stop_sched_tick(ts, ktime_get(), cpu);
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tick_nohz_stop_sched_tick(ts, cpu);
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else if (ts->tick_stopped)
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tick_nohz_restart_sched_tick(ts, ktime_get());
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#endif
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@ -853,10 +875,8 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
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return false;
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}
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if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) {
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ts->sleep_length = NSEC_PER_SEC / HZ;
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if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
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return false;
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}
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if (need_resched())
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return false;
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@ -893,29 +913,37 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
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static void __tick_nohz_idle_stop_tick(struct tick_sched *ts)
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{
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struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev);
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ktime_t expires;
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int cpu = smp_processor_id();
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if (can_stop_idle_tick(cpu, ts)) {
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int was_stopped = ts->tick_stopped;
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WARN_ON_ONCE(ts->timer_expires_base);
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if (!can_stop_idle_tick(cpu, ts))
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goto out;
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expires = tick_nohz_next_event(ts, cpu);
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ts->idle_calls++;
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/*
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* The idle entry time should be a sufficient approximation of
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* the current time at this point.
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*/
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expires = tick_nohz_stop_sched_tick(ts, ts->idle_entrytime, cpu);
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if (expires > 0LL) {
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int was_stopped = ts->tick_stopped;
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tick_nohz_stop_tick(ts, cpu);
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ts->idle_sleeps++;
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ts->idle_expires = expires;
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}
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if (!was_stopped && ts->tick_stopped) {
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ts->idle_jiffies = ts->last_jiffies;
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nohz_balance_enter_idle(cpu);
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}
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} else {
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tick_nohz_retain_tick(ts);
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}
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out:
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ts->sleep_length = ktime_sub(dev->next_event, ts->idle_entrytime);
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}
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/**
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@ -942,6 +970,9 @@ void tick_nohz_idle_enter(void)
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local_irq_disable();
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ts = this_cpu_ptr(&tick_cpu_sched);
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WARN_ON_ONCE(ts->timer_expires_base);
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ts->inidle = 1;
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tick_nohz_start_idle(ts);
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@ -1067,6 +1098,7 @@ void tick_nohz_idle_exit(void)
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local_irq_disable();
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WARN_ON_ONCE(!ts->inidle);
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WARN_ON_ONCE(ts->timer_expires_base);
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ts->inidle = 0;
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@ -39,6 +39,8 @@ enum tick_nohz_mode {
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* @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
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* @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
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* @sleep_length: Duration of the current idle sleep
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* @timer_expires: Anticipated timer expiration time (in case sched tick is stopped)
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* @timer_expires_base: Base time clock monotonic for @timer_expires
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* @do_timer_lst: CPU was the last one doing do_timer before going idle
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*/
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struct tick_sched {
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@ -60,6 +62,8 @@ struct tick_sched {
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ktime_t iowait_sleeptime;
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ktime_t sleep_length;
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unsigned long last_jiffies;
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u64 timer_expires;
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u64 timer_expires_base;
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u64 next_timer;
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ktime_t idle_expires;
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int do_timer_last;
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