timers: Retrieve next expiry of pinned/non-pinned timers separately

For the conversion of the NOHZ timer placement to a pull at expiry time
model it's required to have separate expiry times for the pinned and the
non-pinned (movable) timers. Therefore struct timer_events is introduced.

No functional change

Originally-by: Richard Cochran (linutronix GmbH) <richardcochran@gmail.com>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20240221090548.36600-12-anna-maria@linutronix.de

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index aabd136..38becd2 100644 (file)
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -266,6 +266,11 @@ struct timer_base {
 
 static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]);
 
+struct timer_events {
+       u64     local;
+       u64     global;
+};
+
 #ifdef CONFIG_NO_HZ_COMMON
 
 static DEFINE_STATIC_KEY_FALSE(timers_nohz_active);
@@ -2031,10 +2036,11 @@ static unsigned long next_timer_interrupt(struct timer_base *base,
 static inline u64 __get_next_timer_interrupt(unsigned long basej, u64 basem,
                                             bool *idle)
 {
+       struct timer_events tevt = { .local = KTIME_MAX, .global = KTIME_MAX };
        unsigned long nextevt, nextevt_local, nextevt_global;
        struct timer_base *base_local, *base_global;
-       u64 expires = KTIME_MAX;
        bool local_first;
+       u64 expires;
 
        /*
         * Pretend that there is no timer pending if the cpu is offline.
@@ -2043,7 +2049,7 @@ static inline u64 __get_next_timer_interrupt(unsigned long basej, u64 basem,
        if (cpu_is_offline(smp_processor_id())) {
                if (idle)
                        *idle = true;
-               return expires;
+               return tevt.local;
        }
 
        base_local = this_cpu_ptr(&timer_bases[BASE_LOCAL]);
@@ -2059,13 +2065,32 @@ static inline u64 __get_next_timer_interrupt(unsigned long basej, u64 basem,
 
        nextevt = local_first ? nextevt_local : nextevt_global;
 
-       if (base_local->timers_pending || base_global->timers_pending) {
+       /*
+        * If the @nextevt is at max. one tick away, use @nextevt and store
+        * it in the local expiry value. The next global event is irrelevant in
+        * this case and can be left as KTIME_MAX.
+        */
+       if (time_before_eq(nextevt, basej + 1)) {
                /* If we missed a tick already, force 0 delta */
                if (time_before(nextevt, basej))
                        nextevt = basej;
-               expires = basem + (u64)(nextevt - basej) * TICK_NSEC;
+               tevt.local = basem + (u64)(nextevt - basej) * TICK_NSEC;
+               goto forward;
        }
 
+       /*
+        * Update tevt.* values:
+        *
+        * If the local queue expires first, then the global event can be
+        * ignored. If the global queue is empty, nothing to do either.
+        */
+       if (!local_first && base_global->timers_pending)
+               tevt.global = basem + (u64)(nextevt_global - basej) * TICK_NSEC;
+
+       if (base_local->timers_pending)
+               tevt.local = basem + (u64)(nextevt_local - basej) * TICK_NSEC;
+
+forward:
        /*
         * We have a fresh next event. Check whether we can forward the
         * base.
@@ -2096,6 +2121,8 @@ static inline u64 __get_next_timer_interrupt(unsigned long basej, u64 basem,
        raw_spin_unlock(&base_global->lock);
        raw_spin_unlock(&base_local->lock);
 
+       expires = min_t(u64, tevt.local, tevt.global);
+
        return cmp_next_hrtimer_event(basem, expires);
 }