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/linux-6.12.1/kernel/time/
Dtick-sched.h17 /* The CPU is in the tick idle mode */
19 /* The idle tick has been stopped */
22 * Indicator that the CPU is actively in the tick idle mode;
30 /* High resolution tick mode */
34 * struct tick_sched - sched tick emulation and no idle tick control/stats
37 * @got_idle_tick: Tick timer function has run with @inidle set
39 * @last_tick_jiffies: Value of jiffies seen on last tick
40 * @sched_timer: hrtimer to schedule the periodic tick in high
42 * @last_tick: Store the last tick expiry time when the tick
44 * to resume the tick timer operation in the timeline
[all …]
Dtick-sched.c33 #include "tick-internal.h"
167 * Ensure that the tick is aligned to a multiple of in tick_init_jiffy_update()
256 * When we are idle and the tick is stopped, we have to touch in tick_sched_handle()
269 * In case the current tick fired too early past its expected in tick_sched_handle()
302 * In dynticks mode, tick reprogram is deferred: in tick_nohz_handler()
390 /* Empty, the tick restart happens on tick_nohz_irq_exit() */ in nohz_full_kick_func()
398 * re-evaluate its dependency on the tick and restart it if necessary.
412 * re-evaluate its dependency on the tick and restart it if necessary.
449 * we guarantee it sees the new tick dependency upon in tick_nohz_kick_task()
470 * their dependency on the tick and restart it if necessary.
[all …]
Dtick-common.c3 * This file contains the base functions to manage periodic tick
24 #include "tick-internal.h"
27 * Tick devices
31 * Tick next event: keeps track of the tick time. It's updated by the
32 * CPU which handles the tick and protected by jiffies_lock. There is
84 * Periodic tick
92 /* Keep track of the next tick event */ in tick_periodic()
149 * Setup the device for a periodic tick
182 * Setup the tick device
391 * Stop the tick and transfer the timekeeping job away from a dying cpu.
[all …]
DMakefile12 obj-$(CONFIG_GENERIC_CLOCKEVENTS) += clockevents.o tick-common.o
14 obj-y += tick-broadcast.o
15 obj-$(CONFIG_TICK_ONESHOT) += tick-broadcast-hrtimer.o
18 obj-$(CONFIG_TICK_ONESHOT) += tick-oneshot.o tick-sched.o
19 obj-$(CONFIG_LEGACY_TIMER_TICK) += tick-legacy.o
Djiffies.c13 #include "tick-internal.h"
28 * interrupt hardware to accurately tick at the
30 * for "tick-less" systems.
89 /* Calc cycles per tick */ in register_refined_jiffies()
DKconfig68 The legacy timer tick helper is used by platforms that
94 # only related to the tick functionality. Oneshot clockevent devices
104 prompt "Timer tick handling"
110 This option keeps the tick running periodically at a constant
137 Adaptively try to shutdown the tick whenever possible, even when
Dtick-oneshot.c3 * This file contains functions which manage high resolution tick
18 #include "tick-internal.h"
83 pr_cont(" no tick device\n"); in tick_switch_to_oneshot()
/linux-6.12.1/sound/core/seq/
Dseq_timer.h13 snd_seq_tick_time_t cur_tick; /* current tick */
14 unsigned long resolution; /* time per tick in nsec */
15 unsigned long fraction; /* current time per tick in nsec */
24 unsigned int tempo; /* current tempo, us/tick */
28 struct snd_seq_timer_tick tick; /* current tick */ member
54 static inline void snd_seq_timer_update_tick(struct snd_seq_timer_tick *tick, in snd_seq_timer_update_tick() argument
57 if (tick->resolution > 0) { in snd_seq_timer_update_tick()
58 tick->fraction += resolution; in snd_seq_timer_update_tick()
59 tick->cur_tick += (unsigned int)(tick->fraction / tick->resolution); in snd_seq_timer_update_tick()
60 tick->fraction %= tick->resolution; in snd_seq_timer_update_tick()
Dseq_timer.c27 tmr->tick.resolution = (tmr->tempo * tmr->tempo_base) / tmr->ppq; in snd_seq_timer_set_tick_resolution()
33 tmr->tick.resolution = (tmr->tempo / tmr->ppq) * tmr->tempo_base; in snd_seq_timer_set_tick_resolution()
34 tmr->tick.resolution += s; in snd_seq_timer_set_tick_resolution()
36 if (tmr->tick.resolution <= 0) in snd_seq_timer_set_tick_resolution()
37 tmr->tick.resolution = 1; in snd_seq_timer_set_tick_resolution()
38 snd_seq_timer_update_tick(&tmr->tick, 0); in snd_seq_timer_set_tick_resolution()
106 tmr->tick.cur_tick = 0; in seq_timer_reset()
107 tmr->tick.fraction = 0; in seq_timer_reset()
145 /* calculate current tick */ in snd_seq_timer_interrupt()
146 snd_seq_timer_update_tick(&tmr->tick, resolution); in snd_seq_timer_interrupt()
[all …]
Dseq_prioq.c91 return (snd_seq_compare_tick_time(&a->time.tick, &b->time.tick)); in compare_timestamp()
108 if (a->time.tick > b->time.tick) in compare_timestamp_rel()
110 else if (a->time.tick == b->time.tick) in compare_timestamp_rel()
202 return snd_seq_compare_tick_time(current_time, &ev->time.tick); in event_is_ready()
308 if (cell->event.time.tick) in prioq_match()
357 res = snd_seq_compare_tick_time(&ev->time.tick, &info->time.tick); in prioq_remove_match()
365 res = snd_seq_compare_tick_time(&ev->time.tick, &info->time.tick); in prioq_remove_match()
/linux-6.12.1/tools/testing/selftests/timers/
Dadjtick.c1 /* adjtimex() tick adjustment test
128 tx1.tick = tickval; in check_tick_adj()
135 printf("Estimating tick (act: %ld usec, %lld ppm): ", tickval, ppm); in check_tick_adj()
144 if (tx1.offset || tx1.freq || tx1.tick != tickval) { in check_tick_adj()
153 * cannot match the HZ tick size accurately, so we have a in check_tick_adj()
171 long tick, max, interval, err; in main() local
189 for (tick = (systick - max); tick < (systick + max); tick += interval) { in main()
190 if (check_tick_adj(tick)) { in main()
203 tx1.tick = systick; in main()
/linux-6.12.1/Documentation/timers/
Dhighres.rst100 System-level global event devices are used for the Linux periodic tick. Per-CPU
107 - system global periodic tick (jiffies update)
132 utilize the high resolution and dynamic tick functionalities without any change
136 adding the dynamic tick specific calls to the idle routine (a total of 3 lines
186 Once a system has switched to high resolution mode, the periodic tick is
190 The periodic tick functionality is provided by an per-cpu hrtimer. The callback
193 based periodic tick is designed to be extended with dynamic tick functionality.
195 timer and periodic events (jiffies tick, profiling, process accounting) on UP
200 separated from the tick bound timer softirq to allow accurate delivery of high
211 Dynamic ticks are the logical consequence of the hrtimer based periodic tick
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Dno_hz.rst128 adaptive-tick CPUs: At least one non-adaptive-tick CPU must remain
130 calls like gettimeofday() returns accurate values on adaptive-tick CPUs.
144 Just as with dyntick-idle mode, the benefits of adaptive-tick mode do
156 3. POSIX CPU timers prevent CPUs from entering adaptive-tick mode.
162 all of them over time. Adaptive-tick mode may prevent this
165 entering adaptive-tick mode.
167 5. Scheduler statistics for adaptive-tick CPUs may be computed
168 slightly differently than those for non-adaptive-tick CPUs.
181 enter either dyntick-idle mode or adaptive-tick mode, the most
193 or adaptive-tick mode. That said, note that it is up to userspace to
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/linux-6.12.1/Documentation/admin-guide/pm/
Dcpuidle.rst165 tick can be `stopped by the idle loop <idle-cpus-and-tick_>`_. Available
186 .. _idle-cpus-and-tick:
188 Idle CPUs and The Scheduler Tick
191 The scheduler tick is a timer that triggers periodically in order to implement
199 may not want to give the CPU away voluntarily, however, and the scheduler tick
201 tick, but it is the primary reason for using it.
203 The scheduler tick is problematic from the CPU idle time management perspective,
205 configuration, the length of the tick period is between 1 ms and 10 ms).
206 Thus, if the tick is allowed to trigger on idle CPUs, it will not make sense
208 the tick period length. Moreover, in that case the idle duration of any CPU
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/linux-6.12.1/arch/sparc/include/asm/
Dtimer_64.h47 unsigned int tick[GET_TICK_NINSTR]; member
56 unsigned long tick, tmp1, tmp2; in get_tick() local
80 /* read tick 2 instructions and 11 skipped */ in get_tick()
82 " rd %%tick, %0\n" in get_tick()
92 : "=&r" (tick), "=&r" (tmp1), "=&r" (tmp2) in get_tick()
95 return tick; in get_tick()
/linux-6.12.1/arch/sparc/kernel/
Dtime_64.c71 /* Set things up so user can access tick register for profiling in tick_disable_protection()
73 * read back of %tick after writing it. in tick_disable_protection()
79 "1: rd %%tick, %%g2\n" in tick_disable_protection()
82 " wrpr %%g2, 0, %%tick\n" in tick_disable_protection()
83 " rdpr %%tick, %%g0" in tick_disable_protection()
111 __asm__ __volatile__("rd %%tick, %0\n\t" in tick_get_tick()
122 __asm__ __volatile__("rd %%tick, %0" in tick_add_compare()
145 __asm__ __volatile__("rd %%tick, %0" in tick_add_compare()
157 __asm__ __volatile__("rd %%tick, %0\n\t" in tick_add_tick()
159 "wrpr %0, 0, %%tick\n\t" in tick_add_tick()
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/linux-6.12.1/drivers/cpuidle/governors/
Dmenu.c16 #include <linux/tick.h>
51 * duration always was 50% of the next timer tick, the correction factor will
253 * @stop_tick: indication on whether or not to stop the tick
298 * in this case, assume that without the tick the closest timer in menu_select()
299 * will be in distant future and that the closest tick will occur in menu_select()
300 * after 1/2 of the tick period. in menu_select()
313 * it right away and keep the tick running if state[0] is a in menu_select()
322 * If the tick is already stopped, the cost of possible short in menu_select()
375 * tick in that case and let the governor run in menu_select()
404 * Don't stop the tick if the selected state is a polling one or if the in menu_select()
[all …]
Dteo.c99 #include <linux/tick.h>
205 * If the deepest state's target residency is below the tick length, in teo_update()
207 * to stop the tick. This effectively adds an extra hits-only bin in teo_update()
275 * @stop_tick: Indication on whether or not to stop the scheduler tick.
352 * allow the tick to be stopped it is shallow enough. in teo_select()
377 * Take the possible duration limitation present if the tick in teo_select()
467 * If the selected state's target residency is below the tick length in teo_select()
468 * and intercepts occurring before the tick length are the majority of in teo_select()
469 * total wakeup events, do not stop the tick. in teo_select()
477 * Allow the tick to be stopped unless the selected state is a polling in teo_select()
[all …]
/linux-6.12.1/drivers/net/wireless/ath/carl9170/
Dcmd.c173 unsigned int tick; in carl9170_collect_tally() local
181 tick = le32_to_cpu(tally.tick); in carl9170_collect_tally()
182 if (tick) { in carl9170_collect_tally()
183 ar->tally.active += le32_to_cpu(tally.active) / tick; in carl9170_collect_tally()
184 ar->tally.cca += le32_to_cpu(tally.cca) / tick; in carl9170_collect_tally()
185 ar->tally.tx_time += le32_to_cpu(tally.tx_time) / tick; in carl9170_collect_tally()
/linux-6.12.1/arch/openrisc/kernel/
Dtime.c62 /* This is the clock event device based on the OR1K tick timer.
64 * timers) we cannot enable the PERIODIC feature. The tick timer can run using
137 * This sets up the OpenRISC Tick Timer as a clock source. The tick timer
172 panic("Linux not supported on devices without tick timer"); in time_init()
/linux-6.12.1/drivers/clocksource/
Dbcm_kona_timer.c37 * We use the peripheral timers for system tick, the cpu global timer for
38 * profile tick
112 /* Load the "next" event tick value */ in kona_timer_set_next_event()
180 "Kona Timer Tick", NULL)) in kona_timer_init()
181 pr_err("%s: request_irq() failed\n", "Kona Timer Tick"); in kona_timer_init()
/linux-6.12.1/drivers/net/wireless/mediatek/mt76/
Dutil.c28 int timeout, int tick) in ____mt76_poll_msec() argument
32 timeout /= tick; in ____mt76_poll_msec()
38 usleep_range(1000 * tick, 2000 * tick); in ____mt76_poll_msec()
/linux-6.12.1/sound/firewire/motu/
Damdtp-motu.c314 unsigned int tick; in cache_event_offsets() local
316 tick = ((sph & CIP_SPH_CYCLE_MASK) >> CIP_SPH_CYCLE_SHIFT) * TICKS_PER_CYCLE + in cache_event_offsets()
319 if (tick < base_tick) in cache_event_offsets()
320 tick += TICKS_PER_SECOND; in cache_event_offsets()
321 event_offsets[cache_tail] = tick - base_tick; in cache_event_offsets()
383 unsigned int tick = (base_tick + event_offsets[cache_head]) % TICKS_PER_SECOND; in write_sph() local
384 u32 sph = ((tick / TICKS_PER_CYCLE) << CIP_SPH_CYCLE_SHIFT) | (tick % TICKS_PER_CYCLE); in write_sph()
/linux-6.12.1/include/linux/
Dtimekeeper_internal.h114 * This cached copy ensures we consistently apply the tick
115 * length for an entire tick, as ntp_tick_length may change
116 * mid-tick, and we don't want to apply that new value to
117 * the tick in progress.
/linux-6.12.1/arch/loongarch/kvm/
Dtimer.c11 * ktime_to_tick() - Scale ktime_t to timer tick value.
21 static inline u64 tick_to_ns(struct kvm_vcpu *vcpu, u64 tick) in tick_to_ns() argument
23 return div_u64(tick * MNSEC_PER_SEC, vcpu->arch.timer_mhz); in tick_to_ns()
110 * Set remainder tick value if not expired in kvm_restore_timer()

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