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kernel/hrtimer.c
47.5 KB
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/* * linux/kernel/hrtimer.c * |
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* Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de> |
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* Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar |
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* Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner |
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* * High-resolution kernel timers * * In contrast to the low-resolution timeout API implemented in * kernel/timer.c, hrtimers provide finer resolution and accuracy * depending on system configuration and capabilities. * * These timers are currently used for: * - itimers * - POSIX timers * - nanosleep * - precise in-kernel timing * * Started by: Thomas Gleixner and Ingo Molnar * * Credits: * based on kernel/timer.c * |
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* Help, testing, suggestions, bugfixes, improvements were * provided by: * * George Anzinger, Andrew Morton, Steven Rostedt, Roman Zippel * et. al. * |
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* For licencing details see kernel-base/COPYING */ #include <linux/cpu.h> |
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#include <linux/export.h> |
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#include <linux/percpu.h> #include <linux/hrtimer.h> #include <linux/notifier.h> #include <linux/syscalls.h> |
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#include <linux/kallsyms.h> |
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#include <linux/interrupt.h> |
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#include <linux/tick.h> |
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#include <linux/seq_file.h> #include <linux/err.h> |
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#include <linux/debugobjects.h> |
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#include <linux/sched.h> |
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#include <linux/sched/sysctl.h> |
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#include <linux/sched/rt.h> |
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#include <linux/sched/deadline.h> |
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#include <linux/timer.h> |
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#include <linux/freezer.h> |
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#include <asm/uaccess.h> |
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#include <trace/events/timer.h> |
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/* * The timer bases: |
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* |
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* There are more clockids then hrtimer bases. Thus, we index * into the timer bases by the hrtimer_base_type enum. When trying * to reach a base using a clockid, hrtimer_clockid_to_base() * is used to convert from clockid to the proper hrtimer_base_type. |
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*/ |
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DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) = |
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{ |
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|
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.lock = __RAW_SPIN_LOCK_UNLOCKED(hrtimer_bases.lock), |
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.clock_base = |
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{ |
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{ |
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.index = HRTIMER_BASE_MONOTONIC, .clockid = CLOCK_MONOTONIC, |
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.get_time = &ktime_get, |
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.resolution = KTIME_LOW_RES, |
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}, |
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{ |
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.index = HRTIMER_BASE_REALTIME, .clockid = CLOCK_REALTIME, .get_time = &ktime_get_real, .resolution = KTIME_LOW_RES, }, { |
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.index = HRTIMER_BASE_BOOTTIME, .clockid = CLOCK_BOOTTIME, |
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.get_time = &ktime_get_boottime, .resolution = KTIME_LOW_RES, }, |
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{ .index = HRTIMER_BASE_TAI, .clockid = CLOCK_TAI, .get_time = &ktime_get_clocktai, .resolution = KTIME_LOW_RES, }, |
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} |
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}; |
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static const int hrtimer_clock_to_base_table[MAX_CLOCKS] = { |
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[CLOCK_REALTIME] = HRTIMER_BASE_REALTIME, [CLOCK_MONOTONIC] = HRTIMER_BASE_MONOTONIC, [CLOCK_BOOTTIME] = HRTIMER_BASE_BOOTTIME, |
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[CLOCK_TAI] = HRTIMER_BASE_TAI, |
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}; |
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static inline int hrtimer_clockid_to_base(clockid_t clock_id) { return hrtimer_clock_to_base_table[clock_id]; } |
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/* |
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* Get the coarse grained time at the softirq based on xtime and * wall_to_monotonic. */ |
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static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base) |
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{ |
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ktime_t xtim, mono, boot; |
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struct timespec xts, tom, slp; |
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s32 tai_offset; |
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|
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get_xtime_and_monotonic_and_sleep_offset(&xts, &tom, &slp); |
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tai_offset = timekeeping_get_tai_offset(); |
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xtim = timespec_to_ktime(xts); |
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mono = ktime_add(xtim, timespec_to_ktime(tom)); boot = ktime_add(mono, timespec_to_ktime(slp)); |
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base->clock_base[HRTIMER_BASE_REALTIME].softirq_time = xtim; |
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base->clock_base[HRTIMER_BASE_MONOTONIC].softirq_time = mono; base->clock_base[HRTIMER_BASE_BOOTTIME].softirq_time = boot; |
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base->clock_base[HRTIMER_BASE_TAI].softirq_time = ktime_add(xtim, ktime_set(tai_offset, 0)); |
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} /* |
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* Functions and macros which are different for UP/SMP systems are kept in a * single place */ #ifdef CONFIG_SMP |
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/* * We are using hashed locking: holding per_cpu(hrtimer_bases)[n].lock * means that all timers which are tied to this base via timer->base are * locked, and the base itself is locked too. * * So __run_timers/migrate_timers can safely modify all timers which could * be found on the lists/queues. * * When the timer's base is locked, and the timer removed from list, it is * possible to set timer->base = NULL and drop the lock: the timer remains * locked. */ |
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static struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) |
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{ |
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struct hrtimer_clock_base *base; |
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for (;;) { base = timer->base; if (likely(base != NULL)) { |
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raw_spin_lock_irqsave(&base->cpu_base->lock, *flags); |
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if (likely(base == timer->base)) return base; /* The timer has migrated to another CPU: */ |
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raw_spin_unlock_irqrestore(&base->cpu_base->lock, *flags); |
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} cpu_relax(); } } |
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/* * With HIGHRES=y we do not migrate the timer when it is expiring * before the next event on the target cpu because we cannot reprogram * the target cpu hardware and we would cause it to fire late. * * Called with cpu_base->lock of target cpu held. */ static int hrtimer_check_target(struct hrtimer *timer, struct hrtimer_clock_base *new_base) { #ifdef CONFIG_HIGH_RES_TIMERS ktime_t expires; if (!new_base->cpu_base->hres_active) return 0; expires = ktime_sub(hrtimer_get_expires(timer), new_base->offset); return expires.tv64 <= new_base->cpu_base->expires_next.tv64; #else return 0; #endif } |
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/* * Switch the timer base to the current CPU when possible. */ |
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static inline struct hrtimer_clock_base * |
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switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base, int pinned) |
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{ |
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struct hrtimer_clock_base *new_base; struct hrtimer_cpu_base *new_cpu_base; |
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int this_cpu = smp_processor_id(); |
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int cpu = get_nohz_timer_target(pinned); |
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int basenum = base->index; |
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|
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new_base = &new_cpu_base->clock_base[basenum]; |
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if (base != new_base) { /* |
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* We are trying to move timer to new_base. |
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* However we can't change timer's base while it is running, * so we keep it on the same CPU. No hassle vs. reprogramming * the event source in the high resolution case. The softirq * code will take care of this when the timer function has * completed. There is no conflict as we hold the lock until * the timer is enqueued. */ |
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if (unlikely(hrtimer_callback_running(timer))) |
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return base; /* See the comment in lock_timer_base() */ timer->base = NULL; |
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raw_spin_unlock(&base->cpu_base->lock); raw_spin_lock(&new_base->cpu_base->lock); |
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|
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if (cpu != this_cpu && hrtimer_check_target(timer, new_base)) { cpu = this_cpu; |
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raw_spin_unlock(&new_base->cpu_base->lock); raw_spin_lock(&base->cpu_base->lock); |
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timer->base = base; goto again; |
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} |
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timer->base = new_base; } return new_base; } #else /* CONFIG_SMP */ |
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static inline struct hrtimer_clock_base * |
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lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) { |
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struct hrtimer_clock_base *base = timer->base; |
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|
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raw_spin_lock_irqsave(&base->cpu_base->lock, *flags); |
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return base; } |
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# define switch_hrtimer_base(t, b, p) (b) |
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#endif /* !CONFIG_SMP */ /* * Functions for the union type storage format of ktime_t which are * too large for inlining: */ #if BITS_PER_LONG < 64 # ifndef CONFIG_KTIME_SCALAR /** * ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable |
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* @kt: addend * @nsec: the scalar nsec value to add * * Returns the sum of kt and nsec in ktime_t format */ ktime_t ktime_add_ns(const ktime_t kt, u64 nsec) { ktime_t tmp; if (likely(nsec < NSEC_PER_SEC)) { tmp.tv64 = nsec; } else { unsigned long rem = do_div(nsec, NSEC_PER_SEC); |
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/* Make sure nsec fits into long */ if (unlikely(nsec > KTIME_SEC_MAX)) return (ktime_t){ .tv64 = KTIME_MAX }; |
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tmp = ktime_set((long)nsec, rem); } return ktime_add(kt, tmp); } |
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EXPORT_SYMBOL_GPL(ktime_add_ns); |
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/** * ktime_sub_ns - Subtract a scalar nanoseconds value from a ktime_t variable * @kt: minuend * @nsec: the scalar nsec value to subtract * * Returns the subtraction of @nsec from @kt in ktime_t format */ ktime_t ktime_sub_ns(const ktime_t kt, u64 nsec) { ktime_t tmp; if (likely(nsec < NSEC_PER_SEC)) { tmp.tv64 = nsec; } else { unsigned long rem = do_div(nsec, NSEC_PER_SEC); tmp = ktime_set((long)nsec, rem); } return ktime_sub(kt, tmp); } EXPORT_SYMBOL_GPL(ktime_sub_ns); |
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# endif /* !CONFIG_KTIME_SCALAR */ /* * Divide a ktime value by a nanosecond value */ |
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u64 ktime_divns(const ktime_t kt, s64 div) |
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{ |
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u64 dclc; |
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int sft = 0; |
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dclc = ktime_to_ns(kt); |
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/* Make sure the divisor is less than 2^32: */ while (div >> 32) { sft++; div >>= 1; } dclc >>= sft; do_div(dclc, (unsigned long) div); |
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return dclc; |
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} |
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#endif /* BITS_PER_LONG >= 64 */ |
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/* |
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* Add two ktime values and do a safety check for overflow: */ ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs) { ktime_t res = ktime_add(lhs, rhs); /* * We use KTIME_SEC_MAX here, the maximum timeout which we can * return to user space in a timespec: */ if (res.tv64 < 0 || res.tv64 < lhs.tv64 || res.tv64 < rhs.tv64) res = ktime_set(KTIME_SEC_MAX, 0); return res; } |
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EXPORT_SYMBOL_GPL(ktime_add_safe); |
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#ifdef CONFIG_DEBUG_OBJECTS_TIMERS static struct debug_obj_descr hrtimer_debug_descr; |
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static void *hrtimer_debug_hint(void *addr) { return ((struct hrtimer *) addr)->function; } |
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/* * fixup_init is called when: * - an active object is initialized */ static int hrtimer_fixup_init(void *addr, enum debug_obj_state state) { struct hrtimer *timer = addr; switch (state) { case ODEBUG_STATE_ACTIVE: hrtimer_cancel(timer); debug_object_init(timer, &hrtimer_debug_descr); return 1; default: return 0; } } /* * fixup_activate is called when: * - an active object is activated * - an unknown object is activated (might be a statically initialized object) */ static int hrtimer_fixup_activate(void *addr, enum debug_obj_state state) { switch (state) { case ODEBUG_STATE_NOTAVAILABLE: WARN_ON_ONCE(1); return 0; case ODEBUG_STATE_ACTIVE: WARN_ON(1); default: return 0; } } /* * fixup_free is called when: * - an active object is freed */ static int hrtimer_fixup_free(void *addr, enum debug_obj_state state) { struct hrtimer *timer = addr; switch (state) { case ODEBUG_STATE_ACTIVE: hrtimer_cancel(timer); debug_object_free(timer, &hrtimer_debug_descr); return 1; default: return 0; } } static struct debug_obj_descr hrtimer_debug_descr = { .name = "hrtimer", |
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.debug_hint = hrtimer_debug_hint, |
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.fixup_init = hrtimer_fixup_init, .fixup_activate = hrtimer_fixup_activate, .fixup_free = hrtimer_fixup_free, }; static inline void debug_hrtimer_init(struct hrtimer *timer) { debug_object_init(timer, &hrtimer_debug_descr); } static inline void debug_hrtimer_activate(struct hrtimer *timer) { debug_object_activate(timer, &hrtimer_debug_descr); } static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { debug_object_deactivate(timer, &hrtimer_debug_descr); } static inline void debug_hrtimer_free(struct hrtimer *timer) { debug_object_free(timer, &hrtimer_debug_descr); } static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode); void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { debug_object_init_on_stack(timer, &hrtimer_debug_descr); __hrtimer_init(timer, clock_id, mode); } |
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EXPORT_SYMBOL_GPL(hrtimer_init_on_stack); |
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void destroy_hrtimer_on_stack(struct hrtimer *timer) { debug_object_free(timer, &hrtimer_debug_descr); } #else static inline void debug_hrtimer_init(struct hrtimer *timer) { } static inline void debug_hrtimer_activate(struct hrtimer *timer) { } static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { } #endif |
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static inline void debug_init(struct hrtimer *timer, clockid_t clockid, enum hrtimer_mode mode) { debug_hrtimer_init(timer); trace_hrtimer_init(timer, clockid, mode); } static inline void debug_activate(struct hrtimer *timer) { debug_hrtimer_activate(timer); trace_hrtimer_start(timer); } static inline void debug_deactivate(struct hrtimer *timer) { debug_hrtimer_deactivate(timer); trace_hrtimer_cancel(timer); } |
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/* High resolution timer related functions */ #ifdef CONFIG_HIGH_RES_TIMERS /* * High resolution timer enabled ? */ static int hrtimer_hres_enabled __read_mostly = 1; /* * Enable / Disable high resolution mode */ static int __init setup_hrtimer_hres(char *str) { if (!strcmp(str, "off")) hrtimer_hres_enabled = 0; else if (!strcmp(str, "on")) hrtimer_hres_enabled = 1; else return 0; return 1; } __setup("highres=", setup_hrtimer_hres); /* * hrtimer_high_res_enabled - query, if the highres mode is enabled */ static inline int hrtimer_is_hres_enabled(void) { return hrtimer_hres_enabled; } /* * Is the high resolution mode active ? */ static inline int hrtimer_hres_active(void) { |
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return __this_cpu_read(hrtimer_bases.hres_active); |
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} /* * Reprogram the event source with checking both queues for the * next event * Called with interrupts disabled and base->lock held */ |
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static void hrtimer_force_reprogram(struct hrtimer_cpu_base *cpu_base, int skip_equal) |
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{ int i; struct hrtimer_clock_base *base = cpu_base->clock_base; |
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ktime_t expires, expires_next; |
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|
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expires_next.tv64 = KTIME_MAX; |
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for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { struct hrtimer *timer; |
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struct timerqueue_node *next; |
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|
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next = timerqueue_getnext(&base->active); if (!next) |
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531 |
continue; |
998adc3dd hrtimers: Convert... |
532 |
timer = container_of(next, struct hrtimer, node); |
cc584b213 hrtimer: convert ... |
533 |
expires = ktime_sub(hrtimer_get_expires(timer), base->offset); |
b0a9b5111 hrtimer: prevent ... |
534 535 536 537 538 539 540 |
/* * clock_was_set() has changed base->offset so the * result might be negative. Fix it up to prevent a * false positive in clockevents_program_event() */ if (expires.tv64 < 0) expires.tv64 = 0; |
7403f41f1 hrtimer: Eliminat... |
541 542 |
if (expires.tv64 < expires_next.tv64) expires_next = expires; |
54cdfdb47 [PATCH] hrtimers:... |
543 |
} |
7403f41f1 hrtimer: Eliminat... |
544 545 546 547 |
if (skip_equal && expires_next.tv64 == cpu_base->expires_next.tv64) return; cpu_base->expires_next.tv64 = expires_next.tv64; |
54cdfdb47 [PATCH] hrtimers:... |
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 |
if (cpu_base->expires_next.tv64 != KTIME_MAX) tick_program_event(cpu_base->expires_next, 1); } /* * Shared reprogramming for clock_realtime and clock_monotonic * * When a timer is enqueued and expires earlier than the already enqueued * timers, we have to check, whether it expires earlier than the timer for * which the clock event device was armed. * * Called with interrupts disabled and base->cpu_base.lock held */ static int hrtimer_reprogram(struct hrtimer *timer, struct hrtimer_clock_base *base) { |
41d2e4949 hrtimer: Tune hrt... |
564 |
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); |
cc584b213 hrtimer: convert ... |
565 |
ktime_t expires = ktime_sub(hrtimer_get_expires(timer), base->offset); |
54cdfdb47 [PATCH] hrtimers:... |
566 |
int res; |
cc584b213 hrtimer: convert ... |
567 |
WARN_ON_ONCE(hrtimer_get_expires_tv64(timer) < 0); |
63070a79b hrtimer: catch ex... |
568 |
|
54cdfdb47 [PATCH] hrtimers:... |
569 570 571 |
/* * When the callback is running, we do not reprogram the clock event * device. The timer callback is either running on a different CPU or |
3a4fa0a25 Fix misspellings ... |
572 |
* the callback is executed in the hrtimer_interrupt context. The |
54cdfdb47 [PATCH] hrtimers:... |
573 574 575 576 577 |
* reprogramming is handled either by the softirq, which called the * callback or at the end of the hrtimer_interrupt. */ if (hrtimer_callback_running(timer)) return 0; |
63070a79b hrtimer: catch ex... |
578 579 580 581 582 583 584 585 |
/* * CLOCK_REALTIME timer might be requested with an absolute * expiry time which is less than base->offset. Nothing wrong * about that, just avoid to call into the tick code, which * has now objections against negative expiry values. */ if (expires.tv64 < 0) return -ETIME; |
41d2e4949 hrtimer: Tune hrt... |
586 587 588 589 590 591 592 593 594 595 |
if (expires.tv64 >= cpu_base->expires_next.tv64) return 0; /* * If a hang was detected in the last timer interrupt then we * do not schedule a timer which is earlier than the expiry * which we enforced in the hang detection. We want the system * to make progress. */ if (cpu_base->hang_detected) |
54cdfdb47 [PATCH] hrtimers:... |
596 597 598 599 600 601 602 |
return 0; /* * Clockevents returns -ETIME, when the event was in the past. */ res = tick_program_event(expires, 0); if (!IS_ERR_VALUE(res)) |
41d2e4949 hrtimer: Tune hrt... |
603 |
cpu_base->expires_next = expires; |
54cdfdb47 [PATCH] hrtimers:... |
604 605 |
return res; } |
995f054f2 [PATCH] high-res ... |
606 |
/* |
54cdfdb47 [PATCH] hrtimers:... |
607 608 609 610 611 612 |
* Initialize the high resolution related parts of cpu_base */ static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { base->expires_next.tv64 = KTIME_MAX; base->hres_active = 0; |
54cdfdb47 [PATCH] hrtimers:... |
613 614 615 |
} /* |
54cdfdb47 [PATCH] hrtimers:... |
616 617 618 619 620 621 |
* When High resolution timers are active, try to reprogram. Note, that in case * the state has HRTIMER_STATE_CALLBACK set, no reprogramming and no expiry * check happens. The timer gets enqueued into the rbtree. The reprogramming * and expiry check is done in the hrtimer_interrupt or in the softirq. */ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, |
b22affe0a hrtimer: Prevent ... |
622 |
struct hrtimer_clock_base *base) |
54cdfdb47 [PATCH] hrtimers:... |
623 |
{ |
b22affe0a hrtimer: Prevent ... |
624 |
return base->cpu_base->hres_active && hrtimer_reprogram(timer, base); |
54cdfdb47 [PATCH] hrtimers:... |
625 |
} |
5baefd6d8 hrtimer: Update h... |
626 627 628 629 |
static inline ktime_t hrtimer_update_base(struct hrtimer_cpu_base *base) { ktime_t *offs_real = &base->clock_base[HRTIMER_BASE_REALTIME].offset; ktime_t *offs_boot = &base->clock_base[HRTIMER_BASE_BOOTTIME].offset; |
90adda98b hrtimer: Add hrti... |
630 |
ktime_t *offs_tai = &base->clock_base[HRTIMER_BASE_TAI].offset; |
5baefd6d8 hrtimer: Update h... |
631 |
|
90adda98b hrtimer: Add hrti... |
632 |
return ktime_get_update_offsets(offs_real, offs_boot, offs_tai); |
5baefd6d8 hrtimer: Update h... |
633 |
} |
9ec269075 timerfd: Manage c... |
634 635 636 637 638 639 640 641 |
/* * Retrigger next event is called after clock was set * * Called with interrupts disabled via on_each_cpu() */ static void retrigger_next_event(void *arg) { struct hrtimer_cpu_base *base = &__get_cpu_var(hrtimer_bases); |
9ec269075 timerfd: Manage c... |
642 643 644 |
if (!hrtimer_hres_active()) return; |
9ec269075 timerfd: Manage c... |
645 |
raw_spin_lock(&base->lock); |
5baefd6d8 hrtimer: Update h... |
646 |
hrtimer_update_base(base); |
9ec269075 timerfd: Manage c... |
647 648 649 |
hrtimer_force_reprogram(base, 0); raw_spin_unlock(&base->lock); } |
b12a03ce4 hrtimers: Prepare... |
650 |
|
54cdfdb47 [PATCH] hrtimers:... |
651 652 653 |
/* * Switch to high resolution mode */ |
f8953856e [PATCH] highres: ... |
654 |
static int hrtimer_switch_to_hres(void) |
54cdfdb47 [PATCH] hrtimers:... |
655 |
{ |
b12a03ce4 hrtimers: Prepare... |
656 |
int i, cpu = smp_processor_id(); |
820de5c39 highres: improve ... |
657 |
struct hrtimer_cpu_base *base = &per_cpu(hrtimer_bases, cpu); |
54cdfdb47 [PATCH] hrtimers:... |
658 659 660 |
unsigned long flags; if (base->hres_active) |
f8953856e [PATCH] highres: ... |
661 |
return 1; |
54cdfdb47 [PATCH] hrtimers:... |
662 663 664 665 666 |
local_irq_save(flags); if (tick_init_highres()) { local_irq_restore(flags); |
820de5c39 highres: improve ... |
667 668 669 |
printk(KERN_WARNING "Could not switch to high resolution " "mode on CPU %d ", cpu); |
f8953856e [PATCH] highres: ... |
670 |
return 0; |
54cdfdb47 [PATCH] hrtimers:... |
671 672 |
} base->hres_active = 1; |
b12a03ce4 hrtimers: Prepare... |
673 674 |
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) base->clock_base[i].resolution = KTIME_HIGH_RES; |
54cdfdb47 [PATCH] hrtimers:... |
675 676 |
tick_setup_sched_timer(); |
54cdfdb47 [PATCH] hrtimers:... |
677 678 679 |
/* "Retrigger" the interrupt to get things going */ retrigger_next_event(NULL); local_irq_restore(flags); |
f8953856e [PATCH] highres: ... |
680 |
return 1; |
54cdfdb47 [PATCH] hrtimers:... |
681 |
} |
5ec2481b7 hrtimers: Move SM... |
682 683 684 685 686 687 |
static void clock_was_set_work(struct work_struct *work) { clock_was_set(); } static DECLARE_WORK(hrtimer_work, clock_was_set_work); |
f55a6faa3 hrtimer: Provide ... |
688 |
/* |
5ec2481b7 hrtimers: Move SM... |
689 690 |
* Called from timekeeping and resume code to reprogramm the hrtimer * interrupt device on all cpus. |
f55a6faa3 hrtimer: Provide ... |
691 692 693 |
*/ void clock_was_set_delayed(void) { |
5ec2481b7 hrtimers: Move SM... |
694 |
schedule_work(&hrtimer_work); |
f55a6faa3 hrtimer: Provide ... |
695 |
} |
54cdfdb47 [PATCH] hrtimers:... |
696 697 698 699 |
#else static inline int hrtimer_hres_active(void) { return 0; } static inline int hrtimer_is_hres_enabled(void) { return 0; } |
f8953856e [PATCH] highres: ... |
700 |
static inline int hrtimer_switch_to_hres(void) { return 0; } |
7403f41f1 hrtimer: Eliminat... |
701 702 |
static inline void hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { } |
54cdfdb47 [PATCH] hrtimers:... |
703 |
static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, |
b22affe0a hrtimer: Prevent ... |
704 |
struct hrtimer_clock_base *base) |
54cdfdb47 [PATCH] hrtimers:... |
705 706 707 |
{ return 0; } |
54cdfdb47 [PATCH] hrtimers:... |
708 |
static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { } |
9ec269075 timerfd: Manage c... |
709 |
static inline void retrigger_next_event(void *arg) { } |
54cdfdb47 [PATCH] hrtimers:... |
710 711 |
#endif /* CONFIG_HIGH_RES_TIMERS */ |
b12a03ce4 hrtimers: Prepare... |
712 |
/* |
b12a03ce4 hrtimers: Prepare... |
713 714 715 716 717 718 719 720 721 722 723 724 |
* Clock realtime was set * * Change the offset of the realtime clock vs. the monotonic * clock. * * We might have to reprogram the high resolution timer interrupt. On * SMP we call the architecture specific code to retrigger _all_ high * resolution timer interrupts. On UP we just disable interrupts and * call the high resolution interrupt code. */ void clock_was_set(void) { |
90ff1f30c hrtimers: Fix typ... |
725 |
#ifdef CONFIG_HIGH_RES_TIMERS |
b12a03ce4 hrtimers: Prepare... |
726 727 |
/* Retrigger the CPU local events everywhere */ on_each_cpu(retrigger_next_event, NULL, 1); |
9ec269075 timerfd: Manage c... |
728 729 |
#endif timerfd_clock_was_set(); |
b12a03ce4 hrtimers: Prepare... |
730 731 732 733 |
} /* * During resume we might have to reprogram the high resolution timer |
7c4c3a0f1 hrtimers: Support... |
734 735 |
* interrupt on all online CPUs. However, all other CPUs will be * stopped with IRQs interrupts disabled so the clock_was_set() call |
5ec2481b7 hrtimers: Move SM... |
736 |
* must be deferred. |
b12a03ce4 hrtimers: Prepare... |
737 738 739 740 741 |
*/ void hrtimers_resume(void) { WARN_ONCE(!irqs_disabled(), KERN_INFO "hrtimers_resume() called with IRQs enabled!"); |
5ec2481b7 hrtimers: Move SM... |
742 |
/* Retrigger on the local CPU */ |
b12a03ce4 hrtimers: Prepare... |
743 |
retrigger_next_event(NULL); |
5ec2481b7 hrtimers: Move SM... |
744 745 |
/* And schedule a retrigger for all others */ clock_was_set_delayed(); |
b12a03ce4 hrtimers: Prepare... |
746 |
} |
5f201907d hrtimer: move tim... |
747 |
static inline void timer_stats_hrtimer_set_start_info(struct hrtimer *timer) |
82f67cd9f [PATCH] Add debug... |
748 |
{ |
5f201907d hrtimer: move tim... |
749 |
#ifdef CONFIG_TIMER_STATS |
82f67cd9f [PATCH] Add debug... |
750 751 |
if (timer->start_site) return; |
5f201907d hrtimer: move tim... |
752 |
timer->start_site = __builtin_return_address(0); |
82f67cd9f [PATCH] Add debug... |
753 754 |
memcpy(timer->start_comm, current->comm, TASK_COMM_LEN); timer->start_pid = current->pid; |
5f201907d hrtimer: move tim... |
755 756 757 758 759 760 761 762 |
#endif } static inline void timer_stats_hrtimer_clear_start_info(struct hrtimer *timer) { #ifdef CONFIG_TIMER_STATS timer->start_site = NULL; #endif |
82f67cd9f [PATCH] Add debug... |
763 |
} |
5f201907d hrtimer: move tim... |
764 765 766 767 768 769 770 771 |
static inline void timer_stats_account_hrtimer(struct hrtimer *timer) { #ifdef CONFIG_TIMER_STATS if (likely(!timer_stats_active)) return; timer_stats_update_stats(timer, timer->start_pid, timer->start_site, timer->function, timer->start_comm, 0); |
82f67cd9f [PATCH] Add debug... |
772 |
#endif |
5f201907d hrtimer: move tim... |
773 |
} |
82f67cd9f [PATCH] Add debug... |
774 |
|
c0a313296 [PATCH] hrtimer: ... |
775 |
/* |
6506f2aa6 fix comment: unlo... |
776 |
* Counterpart to lock_hrtimer_base above: |
c0a313296 [PATCH] hrtimer: ... |
777 778 779 780 |
*/ static inline void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags) { |
ecb49d1a6 hrtimers: Convert... |
781 |
raw_spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags); |
c0a313296 [PATCH] hrtimer: ... |
782 783 784 785 |
} /** * hrtimer_forward - forward the timer expiry |
c0a313296 [PATCH] hrtimer: ... |
786 |
* @timer: hrtimer to forward |
44f214755 [PATCH] hrtimers:... |
787 |
* @now: forward past this time |
c0a313296 [PATCH] hrtimer: ... |
788 789 790 |
* @interval: the interval to forward * * Forward the timer expiry so it will expire in the future. |
8dca6f33f [PATCH] hrtimer c... |
791 |
* Returns the number of overruns. |
c0a313296 [PATCH] hrtimer: ... |
792 |
*/ |
4d672e7ac timerfd: new time... |
793 |
u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval) |
c0a313296 [PATCH] hrtimer: ... |
794 |
{ |
4d672e7ac timerfd: new time... |
795 |
u64 orun = 1; |
44f214755 [PATCH] hrtimers:... |
796 |
ktime_t delta; |
c0a313296 [PATCH] hrtimer: ... |
797 |
|
cc584b213 hrtimer: convert ... |
798 |
delta = ktime_sub(now, hrtimer_get_expires(timer)); |
c0a313296 [PATCH] hrtimer: ... |
799 800 801 |
if (delta.tv64 < 0) return 0; |
c9db4fa11 [hrtimer] Enforce... |
802 803 |
if (interval.tv64 < timer->base->resolution.tv64) interval.tv64 = timer->base->resolution.tv64; |
c0a313296 [PATCH] hrtimer: ... |
804 |
if (unlikely(delta.tv64 >= interval.tv64)) { |
df869b630 [PATCH] hrtimers:... |
805 |
s64 incr = ktime_to_ns(interval); |
c0a313296 [PATCH] hrtimer: ... |
806 807 |
orun = ktime_divns(delta, incr); |
cc584b213 hrtimer: convert ... |
808 809 |
hrtimer_add_expires_ns(timer, incr * orun); if (hrtimer_get_expires_tv64(timer) > now.tv64) |
c0a313296 [PATCH] hrtimer: ... |
810 811 812 813 814 815 816 |
return orun; /* * This (and the ktime_add() below) is the * correction for exact: */ orun++; } |
cc584b213 hrtimer: convert ... |
817 |
hrtimer_add_expires(timer, interval); |
c0a313296 [PATCH] hrtimer: ... |
818 819 820 |
return orun; } |
6bdb6b620 export hrtimer_fo... |
821 |
EXPORT_SYMBOL_GPL(hrtimer_forward); |
c0a313296 [PATCH] hrtimer: ... |
822 823 824 825 826 827 |
/* * enqueue_hrtimer - internal function to (re)start a timer * * The timer is inserted in expiry order. Insertion into the * red black tree is O(log(n)). Must hold the base lock. |
a6037b61c hrtimer: fix recu... |
828 829 |
* * Returns 1 when the new timer is the leftmost timer in the tree. |
c0a313296 [PATCH] hrtimer: ... |
830 |
*/ |
a6037b61c hrtimer: fix recu... |
831 832 |
static int enqueue_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base) |
c0a313296 [PATCH] hrtimer: ... |
833 |
{ |
c6a2a1770 hrtimer: Add trac... |
834 |
debug_activate(timer); |
237fc6e7a add hrtimer speci... |
835 |
|
998adc3dd hrtimers: Convert... |
836 |
timerqueue_add(&base->active, &timer->node); |
ab8177bc5 hrtimers: Avoid t... |
837 |
base->cpu_base->active_bases |= 1 << base->index; |
54cdfdb47 [PATCH] hrtimers:... |
838 |
|
303e967ff [PATCH] hrtimers;... |
839 840 841 842 843 |
/* * HRTIMER_STATE_ENQUEUED is or'ed to the current state to preserve the * state of a possibly running callback. */ timer->state |= HRTIMER_STATE_ENQUEUED; |
a6037b61c hrtimer: fix recu... |
844 |
|
998adc3dd hrtimers: Convert... |
845 |
return (&timer->node == base->active.next); |
288867ec5 [hrtimer] Remove ... |
846 |
} |
c0a313296 [PATCH] hrtimer: ... |
847 848 849 850 851 |
/* * __remove_hrtimer - internal function to remove a timer * * Caller must hold the base lock. |
54cdfdb47 [PATCH] hrtimers:... |
852 853 854 855 856 |
* * High resolution timer mode reprograms the clock event device when the * timer is the one which expires next. The caller can disable this by setting * reprogram to zero. This is useful, when the context does a reprogramming * anyway (e.g. timer interrupt) |
c0a313296 [PATCH] hrtimer: ... |
857 |
*/ |
3c8aa39d7 [PATCH] hrtimers:... |
858 |
static void __remove_hrtimer(struct hrtimer *timer, |
303e967ff [PATCH] hrtimers;... |
859 |
struct hrtimer_clock_base *base, |
54cdfdb47 [PATCH] hrtimers:... |
860 |
unsigned long newstate, int reprogram) |
c0a313296 [PATCH] hrtimer: ... |
861 |
{ |
27c9cd7e6 hrtimer: Fix extr... |
862 |
struct timerqueue_node *next_timer; |
7403f41f1 hrtimer: Eliminat... |
863 864 |
if (!(timer->state & HRTIMER_STATE_ENQUEUED)) goto out; |
27c9cd7e6 hrtimer: Fix extr... |
865 866 867 |
next_timer = timerqueue_getnext(&base->active); timerqueue_del(&base->active, &timer->node); if (&timer->node == next_timer) { |
7403f41f1 hrtimer: Eliminat... |
868 869 870 871 872 873 874 875 876 |
#ifdef CONFIG_HIGH_RES_TIMERS /* Reprogram the clock event device. if enabled */ if (reprogram && hrtimer_hres_active()) { ktime_t expires; expires = ktime_sub(hrtimer_get_expires(timer), base->offset); if (base->cpu_base->expires_next.tv64 == expires.tv64) hrtimer_force_reprogram(base->cpu_base, 1); |
54cdfdb47 [PATCH] hrtimers:... |
877 |
} |
7403f41f1 hrtimer: Eliminat... |
878 |
#endif |
54cdfdb47 [PATCH] hrtimers:... |
879 |
} |
ab8177bc5 hrtimers: Avoid t... |
880 881 |
if (!timerqueue_getnext(&base->active)) base->cpu_base->active_bases &= ~(1 << base->index); |
7403f41f1 hrtimer: Eliminat... |
882 |
out: |
303e967ff [PATCH] hrtimers;... |
883 |
timer->state = newstate; |
c0a313296 [PATCH] hrtimer: ... |
884 885 886 887 888 889 |
} /* * remove hrtimer, called with base lock held */ static inline int |
3c8aa39d7 [PATCH] hrtimers:... |
890 |
remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base) |
c0a313296 [PATCH] hrtimer: ... |
891 |
{ |
303e967ff [PATCH] hrtimers;... |
892 |
if (hrtimer_is_queued(timer)) { |
f13d4f979 hrtimer: Preserve... |
893 |
unsigned long state; |
54cdfdb47 [PATCH] hrtimers:... |
894 895 896 897 898 899 900 901 902 903 |
int reprogram; /* * Remove the timer and force reprogramming when high * resolution mode is active and the timer is on the current * CPU. If we remove a timer on another CPU, reprogramming is * skipped. The interrupt event on this CPU is fired and * reprogramming happens in the interrupt handler. This is a * rare case and less expensive than a smp call. */ |
c6a2a1770 hrtimer: Add trac... |
904 |
debug_deactivate(timer); |
82f67cd9f [PATCH] Add debug... |
905 |
timer_stats_hrtimer_clear_start_info(timer); |
54cdfdb47 [PATCH] hrtimers:... |
906 |
reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases); |
f13d4f979 hrtimer: Preserve... |
907 908 909 910 911 912 913 |
/* * We must preserve the CALLBACK state flag here, * otherwise we could move the timer base in * switch_hrtimer_base. */ state = timer->state & HRTIMER_STATE_CALLBACK; __remove_hrtimer(timer, base, state, reprogram); |
c0a313296 [PATCH] hrtimer: ... |
914 915 916 917 |
return 1; } return 0; } |
7f1e2ca9f hrtimer: fix rq->... |
918 919 920 |
int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_ns, const enum hrtimer_mode mode, int wakeup) |
c0a313296 [PATCH] hrtimer: ... |
921 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
922 |
struct hrtimer_clock_base *base, *new_base; |
c0a313296 [PATCH] hrtimer: ... |
923 |
unsigned long flags; |
a6037b61c hrtimer: fix recu... |
924 |
int ret, leftmost; |
c0a313296 [PATCH] hrtimer: ... |
925 926 927 928 929 930 931 |
base = lock_hrtimer_base(timer, &flags); /* Remove an active timer from the queue: */ ret = remove_hrtimer(timer, base); /* Switch the timer base, if necessary: */ |
597d02757 timers: Framework... |
932 |
new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED); |
c0a313296 [PATCH] hrtimer: ... |
933 |
|
597d02757 timers: Framework... |
934 |
if (mode & HRTIMER_MODE_REL) { |
5a7780e72 hrtimer: check re... |
935 |
tim = ktime_add_safe(tim, new_base->get_time()); |
06027bdd2 [PATCH] hrtimer: ... |
936 937 938 939 940 941 942 943 |
/* * CONFIG_TIME_LOW_RES is a temporary way for architectures * to signal that they simply return xtime in * do_gettimeoffset(). In this case we want to round up by * resolution when starting a relative timer, to avoid short * timeouts. This will go away with the GTOD framework. */ #ifdef CONFIG_TIME_LOW_RES |
5a7780e72 hrtimer: check re... |
944 |
tim = ktime_add_safe(tim, base->resolution); |
06027bdd2 [PATCH] hrtimer: ... |
945 946 |
#endif } |
237fc6e7a add hrtimer speci... |
947 |
|
da8f2e170 hrtimer: add a hr... |
948 |
hrtimer_set_expires_range_ns(timer, tim, delta_ns); |
c0a313296 [PATCH] hrtimer: ... |
949 |
|
82f67cd9f [PATCH] Add debug... |
950 |
timer_stats_hrtimer_set_start_info(timer); |
a6037b61c hrtimer: fix recu... |
951 |
leftmost = enqueue_hrtimer(timer, new_base); |
935c631db [PATCH] hrtimers:... |
952 953 954 |
/* * Only allow reprogramming if the new base is on this CPU. * (it might still be on another CPU if the timer was pending) |
a6037b61c hrtimer: fix recu... |
955 956 |
* * XXX send_remote_softirq() ? |
935c631db [PATCH] hrtimers:... |
957 |
*/ |
b22affe0a hrtimer: Prevent ... |
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 |
if (leftmost && new_base->cpu_base == &__get_cpu_var(hrtimer_bases) && hrtimer_enqueue_reprogram(timer, new_base)) { if (wakeup) { /* * We need to drop cpu_base->lock to avoid a * lock ordering issue vs. rq->lock. */ raw_spin_unlock(&new_base->cpu_base->lock); raise_softirq_irqoff(HRTIMER_SOFTIRQ); local_irq_restore(flags); return ret; } else { __raise_softirq_irqoff(HRTIMER_SOFTIRQ); } } |
c0a313296 [PATCH] hrtimer: ... |
973 974 975 976 977 |
unlock_hrtimer_base(timer, &flags); return ret; } |
7f1e2ca9f hrtimer: fix rq->... |
978 979 980 981 982 983 |
/** * hrtimer_start_range_ns - (re)start an hrtimer on the current CPU * @timer: the timer to be added * @tim: expiry time * @delta_ns: "slack" range for the timer |
8ffbc7d9f hrtimer/trivial: ... |
984 985 |
* @mode: expiry mode: absolute (HRTIMER_MODE_ABS) or * relative (HRTIMER_MODE_REL) |
7f1e2ca9f hrtimer: fix rq->... |
986 987 988 989 990 991 992 993 994 995 |
* * Returns: * 0 on success * 1 when the timer was active */ int hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim, unsigned long delta_ns, const enum hrtimer_mode mode) { return __hrtimer_start_range_ns(timer, tim, delta_ns, mode, 1); } |
da8f2e170 hrtimer: add a hr... |
996 997 998 |
EXPORT_SYMBOL_GPL(hrtimer_start_range_ns); /** |
e1dd7bc58 hrtimers: fix doc... |
999 |
* hrtimer_start - (re)start an hrtimer on the current CPU |
da8f2e170 hrtimer: add a hr... |
1000 1001 |
* @timer: the timer to be added * @tim: expiry time |
8ffbc7d9f hrtimer/trivial: ... |
1002 1003 |
* @mode: expiry mode: absolute (HRTIMER_MODE_ABS) or * relative (HRTIMER_MODE_REL) |
da8f2e170 hrtimer: add a hr... |
1004 1005 1006 1007 1008 1009 1010 1011 |
* * Returns: * 0 on success * 1 when the timer was active */ int hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode) { |
7f1e2ca9f hrtimer: fix rq->... |
1012 |
return __hrtimer_start_range_ns(timer, tim, 0, mode, 1); |
da8f2e170 hrtimer: add a hr... |
1013 |
} |
8d16b7642 [PATCH] hrtimer: ... |
1014 |
EXPORT_SYMBOL_GPL(hrtimer_start); |
c0a313296 [PATCH] hrtimer: ... |
1015 |
|
da8f2e170 hrtimer: add a hr... |
1016 |
|
c0a313296 [PATCH] hrtimer: ... |
1017 1018 |
/** * hrtimer_try_to_cancel - try to deactivate a timer |
c0a313296 [PATCH] hrtimer: ... |
1019 1020 1021 1022 1023 1024 |
* @timer: hrtimer to stop * * Returns: * 0 when the timer was not active * 1 when the timer was active * -1 when the timer is currently excuting the callback function and |
fa9799e33 [PATCH] ktime/hrt... |
1025 |
* cannot be stopped |
c0a313296 [PATCH] hrtimer: ... |
1026 1027 1028 |
*/ int hrtimer_try_to_cancel(struct hrtimer *timer) { |
3c8aa39d7 [PATCH] hrtimers:... |
1029 |
struct hrtimer_clock_base *base; |
c0a313296 [PATCH] hrtimer: ... |
1030 1031 1032 1033 |
unsigned long flags; int ret = -1; base = lock_hrtimer_base(timer, &flags); |
303e967ff [PATCH] hrtimers;... |
1034 |
if (!hrtimer_callback_running(timer)) |
c0a313296 [PATCH] hrtimer: ... |
1035 1036 1037 1038 1039 1040 1041 |
ret = remove_hrtimer(timer, base); unlock_hrtimer_base(timer, &flags); return ret; } |
8d16b7642 [PATCH] hrtimer: ... |
1042 |
EXPORT_SYMBOL_GPL(hrtimer_try_to_cancel); |
c0a313296 [PATCH] hrtimer: ... |
1043 1044 1045 |
/** * hrtimer_cancel - cancel a timer and wait for the handler to finish. |
c0a313296 [PATCH] hrtimer: ... |
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 |
* @timer: the timer to be cancelled * * Returns: * 0 when the timer was not active * 1 when the timer was active */ int hrtimer_cancel(struct hrtimer *timer) { for (;;) { int ret = hrtimer_try_to_cancel(timer); if (ret >= 0) return ret; |
5ef37b196 [PATCH] add cpu_r... |
1059 |
cpu_relax(); |
c0a313296 [PATCH] hrtimer: ... |
1060 1061 |
} } |
8d16b7642 [PATCH] hrtimer: ... |
1062 |
EXPORT_SYMBOL_GPL(hrtimer_cancel); |
c0a313296 [PATCH] hrtimer: ... |
1063 1064 1065 |
/** * hrtimer_get_remaining - get remaining time for the timer |
c0a313296 [PATCH] hrtimer: ... |
1066 1067 1068 1069 |
* @timer: the timer to read */ ktime_t hrtimer_get_remaining(const struct hrtimer *timer) { |
c0a313296 [PATCH] hrtimer: ... |
1070 1071 |
unsigned long flags; ktime_t rem; |
b3bd3de66 gcc-4.6: kernel/*... |
1072 |
lock_hrtimer_base(timer, &flags); |
cc584b213 hrtimer: convert ... |
1073 |
rem = hrtimer_expires_remaining(timer); |
c0a313296 [PATCH] hrtimer: ... |
1074 1075 1076 1077 |
unlock_hrtimer_base(timer, &flags); return rem; } |
8d16b7642 [PATCH] hrtimer: ... |
1078 |
EXPORT_SYMBOL_GPL(hrtimer_get_remaining); |
c0a313296 [PATCH] hrtimer: ... |
1079 |
|
3451d0243 nohz: Rename CONF... |
1080 |
#ifdef CONFIG_NO_HZ_COMMON |
69239749e [PATCH] fix next_... |
1081 1082 1083 1084 1085 1086 1087 1088 |
/** * hrtimer_get_next_event - get the time until next expiry event * * Returns the delta to the next expiry event or KTIME_MAX if no timer * is pending. */ ktime_t hrtimer_get_next_event(void) { |
3c8aa39d7 [PATCH] hrtimers:... |
1089 1090 |
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base = cpu_base->clock_base; |
69239749e [PATCH] fix next_... |
1091 1092 1093 |
ktime_t delta, mindelta = { .tv64 = KTIME_MAX }; unsigned long flags; int i; |
ecb49d1a6 hrtimers: Convert... |
1094 |
raw_spin_lock_irqsave(&cpu_base->lock, flags); |
3c8aa39d7 [PATCH] hrtimers:... |
1095 |
|
54cdfdb47 [PATCH] hrtimers:... |
1096 1097 1098 |
if (!hrtimer_hres_active()) { for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) { struct hrtimer *timer; |
998adc3dd hrtimers: Convert... |
1099 |
struct timerqueue_node *next; |
69239749e [PATCH] fix next_... |
1100 |
|
998adc3dd hrtimers: Convert... |
1101 1102 |
next = timerqueue_getnext(&base->active); if (!next) |
54cdfdb47 [PATCH] hrtimers:... |
1103 |
continue; |
3c8aa39d7 [PATCH] hrtimers:... |
1104 |
|
998adc3dd hrtimers: Convert... |
1105 |
timer = container_of(next, struct hrtimer, node); |
cc584b213 hrtimer: convert ... |
1106 |
delta.tv64 = hrtimer_get_expires_tv64(timer); |
54cdfdb47 [PATCH] hrtimers:... |
1107 1108 1109 1110 |
delta = ktime_sub(delta, base->get_time()); if (delta.tv64 < mindelta.tv64) mindelta.tv64 = delta.tv64; } |
69239749e [PATCH] fix next_... |
1111 |
} |
3c8aa39d7 [PATCH] hrtimers:... |
1112 |
|
ecb49d1a6 hrtimers: Convert... |
1113 |
raw_spin_unlock_irqrestore(&cpu_base->lock, flags); |
3c8aa39d7 [PATCH] hrtimers:... |
1114 |
|
69239749e [PATCH] fix next_... |
1115 1116 1117 1118 1119 |
if (mindelta.tv64 < 0) mindelta.tv64 = 0; return mindelta; } #endif |
237fc6e7a add hrtimer speci... |
1120 1121 |
static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) |
c0a313296 [PATCH] hrtimer: ... |
1122 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
1123 |
struct hrtimer_cpu_base *cpu_base; |
e06383db9 hrtimers: extend ... |
1124 |
int base; |
c0a313296 [PATCH] hrtimer: ... |
1125 |
|
7978672c4 [PATCH] hrtimers:... |
1126 |
memset(timer, 0, sizeof(struct hrtimer)); |
3c8aa39d7 [PATCH] hrtimers:... |
1127 |
cpu_base = &__raw_get_cpu_var(hrtimer_bases); |
c0a313296 [PATCH] hrtimer: ... |
1128 |
|
c9cb2e3d7 [PATCH] hrtimers:... |
1129 |
if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS) |
7978672c4 [PATCH] hrtimers:... |
1130 |
clock_id = CLOCK_MONOTONIC; |
e06383db9 hrtimers: extend ... |
1131 1132 |
base = hrtimer_clockid_to_base(clock_id); timer->base = &cpu_base->clock_base[base]; |
998adc3dd hrtimers: Convert... |
1133 |
timerqueue_init(&timer->node); |
82f67cd9f [PATCH] Add debug... |
1134 1135 1136 1137 1138 1139 |
#ifdef CONFIG_TIMER_STATS timer->start_site = NULL; timer->start_pid = -1; memset(timer->start_comm, 0, TASK_COMM_LEN); #endif |
c0a313296 [PATCH] hrtimer: ... |
1140 |
} |
237fc6e7a add hrtimer speci... |
1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 |
/** * hrtimer_init - initialize a timer to the given clock * @timer: the timer to be initialized * @clock_id: the clock to be used * @mode: timer mode abs/rel */ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, enum hrtimer_mode mode) { |
c6a2a1770 hrtimer: Add trac... |
1151 |
debug_init(timer, clock_id, mode); |
237fc6e7a add hrtimer speci... |
1152 1153 |
__hrtimer_init(timer, clock_id, mode); } |
8d16b7642 [PATCH] hrtimer: ... |
1154 |
EXPORT_SYMBOL_GPL(hrtimer_init); |
c0a313296 [PATCH] hrtimer: ... |
1155 1156 1157 |
/** * hrtimer_get_res - get the timer resolution for a clock |
c0a313296 [PATCH] hrtimer: ... |
1158 1159 1160 |
* @which_clock: which clock to query * @tp: pointer to timespec variable to store the resolution * |
72fd4a35a [PATCH] Numerous ... |
1161 1162 |
* Store the resolution of the clock selected by @which_clock in the * variable pointed to by @tp. |
c0a313296 [PATCH] hrtimer: ... |
1163 1164 1165 |
*/ int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp) { |
3c8aa39d7 [PATCH] hrtimers:... |
1166 |
struct hrtimer_cpu_base *cpu_base; |
e06383db9 hrtimers: extend ... |
1167 |
int base = hrtimer_clockid_to_base(which_clock); |
c0a313296 [PATCH] hrtimer: ... |
1168 |
|
3c8aa39d7 [PATCH] hrtimers:... |
1169 |
cpu_base = &__raw_get_cpu_var(hrtimer_bases); |
e06383db9 hrtimers: extend ... |
1170 |
*tp = ktime_to_timespec(cpu_base->clock_base[base].resolution); |
c0a313296 [PATCH] hrtimer: ... |
1171 1172 1173 |
return 0; } |
8d16b7642 [PATCH] hrtimer: ... |
1174 |
EXPORT_SYMBOL_GPL(hrtimer_get_res); |
c0a313296 [PATCH] hrtimer: ... |
1175 |
|
c6a2a1770 hrtimer: Add trac... |
1176 |
static void __run_hrtimer(struct hrtimer *timer, ktime_t *now) |
d3d74453c hrtimer: fixup th... |
1177 1178 1179 1180 1181 |
{ struct hrtimer_clock_base *base = timer->base; struct hrtimer_cpu_base *cpu_base = base->cpu_base; enum hrtimer_restart (*fn)(struct hrtimer *); int restart; |
ca109491f hrtimer: removing... |
1182 |
WARN_ON(!irqs_disabled()); |
c6a2a1770 hrtimer: Add trac... |
1183 |
debug_deactivate(timer); |
d3d74453c hrtimer: fixup th... |
1184 1185 |
__remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0); timer_stats_account_hrtimer(timer); |
d3d74453c hrtimer: fixup th... |
1186 |
fn = timer->function; |
ca109491f hrtimer: removing... |
1187 1188 1189 1190 1191 1192 |
/* * Because we run timers from hardirq context, there is no chance * they get migrated to another cpu, therefore its safe to unlock * the timer base. */ |
ecb49d1a6 hrtimers: Convert... |
1193 |
raw_spin_unlock(&cpu_base->lock); |
c6a2a1770 hrtimer: Add trac... |
1194 |
trace_hrtimer_expire_entry(timer, now); |
ca109491f hrtimer: removing... |
1195 |
restart = fn(timer); |
c6a2a1770 hrtimer: Add trac... |
1196 |
trace_hrtimer_expire_exit(timer); |
ecb49d1a6 hrtimers: Convert... |
1197 |
raw_spin_lock(&cpu_base->lock); |
d3d74453c hrtimer: fixup th... |
1198 1199 |
/* |
e3f1d8837 hrtimer: fixup co... |
1200 1201 1202 |
* Note: We clear the CALLBACK bit after enqueue_hrtimer and * we do not reprogramm the event hardware. Happens either in * hrtimer_start_range_ns() or in hrtimer_interrupt() |
d3d74453c hrtimer: fixup th... |
1203 1204 1205 |
*/ if (restart != HRTIMER_NORESTART) { BUG_ON(timer->state != HRTIMER_STATE_CALLBACK); |
a6037b61c hrtimer: fix recu... |
1206 |
enqueue_hrtimer(timer, base); |
d3d74453c hrtimer: fixup th... |
1207 |
} |
f13d4f979 hrtimer: Preserve... |
1208 1209 |
WARN_ON_ONCE(!(timer->state & HRTIMER_STATE_CALLBACK)); |
d3d74453c hrtimer: fixup th... |
1210 1211 |
timer->state &= ~HRTIMER_STATE_CALLBACK; } |
54cdfdb47 [PATCH] hrtimers:... |
1212 1213 1214 1215 1216 1217 1218 1219 1220 |
#ifdef CONFIG_HIGH_RES_TIMERS /* * High resolution timer interrupt * Called with interrupts disabled */ void hrtimer_interrupt(struct clock_event_device *dev) { struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); |
41d2e4949 hrtimer: Tune hrt... |
1221 1222 |
ktime_t expires_next, now, entry_time, delta; int i, retries = 0; |
54cdfdb47 [PATCH] hrtimers:... |
1223 1224 1225 1226 |
BUG_ON(!cpu_base->hres_active); cpu_base->nr_events++; dev->next_event.tv64 = KTIME_MAX; |
196951e91 hrtimers: Move lo... |
1227 |
raw_spin_lock(&cpu_base->lock); |
5baefd6d8 hrtimer: Update h... |
1228 |
entry_time = now = hrtimer_update_base(cpu_base); |
41d2e4949 hrtimer: Tune hrt... |
1229 |
retry: |
54cdfdb47 [PATCH] hrtimers:... |
1230 |
expires_next.tv64 = KTIME_MAX; |
6ff7041db hrtimer: Fix migr... |
1231 1232 1233 1234 1235 1236 1237 1238 |
/* * We set expires_next to KTIME_MAX here with cpu_base->lock * held to prevent that a timer is enqueued in our queue via * the migration code. This does not affect enqueueing of * timers which run their callback and need to be requeued on * this CPU. */ cpu_base->expires_next.tv64 = KTIME_MAX; |
54cdfdb47 [PATCH] hrtimers:... |
1239 |
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
ab8177bc5 hrtimers: Avoid t... |
1240 |
struct hrtimer_clock_base *base; |
998adc3dd hrtimers: Convert... |
1241 |
struct timerqueue_node *node; |
ab8177bc5 hrtimers: Avoid t... |
1242 1243 1244 1245 |
ktime_t basenow; if (!(cpu_base->active_bases & (1 << i))) continue; |
54cdfdb47 [PATCH] hrtimers:... |
1246 |
|
ab8177bc5 hrtimers: Avoid t... |
1247 |
base = cpu_base->clock_base + i; |
54cdfdb47 [PATCH] hrtimers:... |
1248 |
basenow = ktime_add(now, base->offset); |
998adc3dd hrtimers: Convert... |
1249 |
while ((node = timerqueue_getnext(&base->active))) { |
54cdfdb47 [PATCH] hrtimers:... |
1250 |
struct hrtimer *timer; |
998adc3dd hrtimers: Convert... |
1251 |
timer = container_of(node, struct hrtimer, node); |
54cdfdb47 [PATCH] hrtimers:... |
1252 |
|
654c8e0b1 hrtimer: turn hrt... |
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 |
/* * The immediate goal for using the softexpires is * minimizing wakeups, not running timers at the * earliest interrupt after their soft expiration. * This allows us to avoid using a Priority Search * Tree, which can answer a stabbing querry for * overlapping intervals and instead use the simple * BST we already have. * We don't add extra wakeups by delaying timers that * are right-of a not yet expired timer, because that * timer will have to trigger a wakeup anyway. */ if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer)) { |
54cdfdb47 [PATCH] hrtimers:... |
1267 |
ktime_t expires; |
cc584b213 hrtimer: convert ... |
1268 |
expires = ktime_sub(hrtimer_get_expires(timer), |
54cdfdb47 [PATCH] hrtimers:... |
1269 |
base->offset); |
8f294b5a1 hrtimer: Add expi... |
1270 1271 |
if (expires.tv64 < 0) expires.tv64 = KTIME_MAX; |
54cdfdb47 [PATCH] hrtimers:... |
1272 1273 1274 1275 |
if (expires.tv64 < expires_next.tv64) expires_next = expires; break; } |
c6a2a1770 hrtimer: Add trac... |
1276 |
__run_hrtimer(timer, &basenow); |
54cdfdb47 [PATCH] hrtimers:... |
1277 |
} |
54cdfdb47 [PATCH] hrtimers:... |
1278 |
} |
6ff7041db hrtimer: Fix migr... |
1279 1280 1281 1282 |
/* * Store the new expiry value so the migration code can verify * against it. */ |
54cdfdb47 [PATCH] hrtimers:... |
1283 |
cpu_base->expires_next = expires_next; |
ecb49d1a6 hrtimers: Convert... |
1284 |
raw_spin_unlock(&cpu_base->lock); |
54cdfdb47 [PATCH] hrtimers:... |
1285 1286 |
/* Reprogramming necessary ? */ |
41d2e4949 hrtimer: Tune hrt... |
1287 1288 1289 1290 |
if (expires_next.tv64 == KTIME_MAX || !tick_program_event(expires_next, 0)) { cpu_base->hang_detected = 0; return; |
54cdfdb47 [PATCH] hrtimers:... |
1291 |
} |
41d2e4949 hrtimer: Tune hrt... |
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 |
/* * The next timer was already expired due to: * - tracing * - long lasting callbacks * - being scheduled away when running in a VM * * We need to prevent that we loop forever in the hrtimer * interrupt routine. We give it 3 attempts to avoid * overreacting on some spurious event. |
5baefd6d8 hrtimer: Update h... |
1302 1303 1304 |
* * Acquire base lock for updating the offsets and retrieving * the current time. |
41d2e4949 hrtimer: Tune hrt... |
1305 |
*/ |
196951e91 hrtimers: Move lo... |
1306 |
raw_spin_lock(&cpu_base->lock); |
5baefd6d8 hrtimer: Update h... |
1307 |
now = hrtimer_update_base(cpu_base); |
41d2e4949 hrtimer: Tune hrt... |
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 |
cpu_base->nr_retries++; if (++retries < 3) goto retry; /* * Give the system a chance to do something else than looping * here. We stored the entry time, so we know exactly how long * we spent here. We schedule the next event this amount of * time away. */ cpu_base->nr_hangs++; cpu_base->hang_detected = 1; |
196951e91 hrtimers: Move lo... |
1319 |
raw_spin_unlock(&cpu_base->lock); |
41d2e4949 hrtimer: Tune hrt... |
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 |
delta = ktime_sub(now, entry_time); if (delta.tv64 > cpu_base->max_hang_time.tv64) cpu_base->max_hang_time = delta; /* * Limit it to a sensible value as we enforce a longer * delay. Give the CPU at least 100ms to catch up. */ if (delta.tv64 > 100 * NSEC_PER_MSEC) expires_next = ktime_add_ns(now, 100 * NSEC_PER_MSEC); else expires_next = ktime_add(now, delta); tick_program_event(expires_next, 1); printk_once(KERN_WARNING "hrtimer: interrupt took %llu ns ", ktime_to_ns(delta)); |
54cdfdb47 [PATCH] hrtimers:... |
1335 |
} |
8bdec955b hrtimer: splitout... |
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 |
/* * local version of hrtimer_peek_ahead_timers() called with interrupts * disabled. */ static void __hrtimer_peek_ahead_timers(void) { struct tick_device *td; if (!hrtimer_hres_active()) return; td = &__get_cpu_var(tick_cpu_device); if (td && td->evtdev) hrtimer_interrupt(td->evtdev); } |
2e94d1f71 hrtimer: peek at ... |
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 |
/** * hrtimer_peek_ahead_timers -- run soft-expired timers now * * hrtimer_peek_ahead_timers will peek at the timer queue of * the current cpu and check if there are any timers for which * the soft expires time has passed. If any such timers exist, * they are run immediately and then removed from the timer queue. * */ void hrtimer_peek_ahead_timers(void) { |
643bdf68f hrtimers: simplif... |
1362 |
unsigned long flags; |
dc4304f7d rangetimers: fix ... |
1363 |
|
2e94d1f71 hrtimer: peek at ... |
1364 |
local_irq_save(flags); |
8bdec955b hrtimer: splitout... |
1365 |
__hrtimer_peek_ahead_timers(); |
2e94d1f71 hrtimer: peek at ... |
1366 1367 |
local_irq_restore(flags); } |
a6037b61c hrtimer: fix recu... |
1368 1369 1370 1371 |
static void run_hrtimer_softirq(struct softirq_action *h) { hrtimer_peek_ahead_timers(); } |
82c5b7b52 hrtimer: splitout... |
1372 1373 1374 1375 1376 |
#else /* CONFIG_HIGH_RES_TIMERS */ static inline void __hrtimer_peek_ahead_timers(void) { } #endif /* !CONFIG_HIGH_RES_TIMERS */ |
82f67cd9f [PATCH] Add debug... |
1377 |
|
d3d74453c hrtimer: fixup th... |
1378 1379 1380 1381 1382 1383 1384 1385 1386 |
/* * Called from timer softirq every jiffy, expire hrtimers: * * For HRT its the fall back code to run the softirq in the timer * softirq context in case the hrtimer initialization failed or has * not been done yet. */ void hrtimer_run_pending(void) { |
d3d74453c hrtimer: fixup th... |
1387 1388 |
if (hrtimer_hres_active()) return; |
54cdfdb47 [PATCH] hrtimers:... |
1389 |
|
d3d74453c hrtimer: fixup th... |
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 |
/* * This _is_ ugly: We have to check in the softirq context, * whether we can switch to highres and / or nohz mode. The * clocksource switch happens in the timer interrupt with * xtime_lock held. Notification from there only sets the * check bit in the tick_oneshot code, otherwise we might * deadlock vs. xtime_lock. */ if (tick_check_oneshot_change(!hrtimer_is_hres_enabled())) hrtimer_switch_to_hres(); |
54cdfdb47 [PATCH] hrtimers:... |
1400 |
} |
c0a313296 [PATCH] hrtimer: ... |
1401 |
/* |
d3d74453c hrtimer: fixup th... |
1402 |
* Called from hardirq context every jiffy |
c0a313296 [PATCH] hrtimer: ... |
1403 |
*/ |
833883d9a hrtimer: reduce c... |
1404 |
void hrtimer_run_queues(void) |
c0a313296 [PATCH] hrtimer: ... |
1405 |
{ |
998adc3dd hrtimers: Convert... |
1406 |
struct timerqueue_node *node; |
833883d9a hrtimer: reduce c... |
1407 1408 1409 |
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases); struct hrtimer_clock_base *base; int index, gettime = 1; |
c0a313296 [PATCH] hrtimer: ... |
1410 |
|
833883d9a hrtimer: reduce c... |
1411 |
if (hrtimer_hres_active()) |
3055addad [PATCH] hrtimer: ... |
1412 |
return; |
833883d9a hrtimer: reduce c... |
1413 1414 |
for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) { base = &cpu_base->clock_base[index]; |
b007c389d hrtimer: fix time... |
1415 |
if (!timerqueue_getnext(&base->active)) |
d3d74453c hrtimer: fixup th... |
1416 |
continue; |
833883d9a hrtimer: reduce c... |
1417 |
|
d7cfb60c5 hrtimer: remove h... |
1418 |
if (gettime) { |
833883d9a hrtimer: reduce c... |
1419 1420 |
hrtimer_get_softirq_time(cpu_base); gettime = 0; |
b75f7a51c [PATCH] hrtimers:... |
1421 |
} |
d3d74453c hrtimer: fixup th... |
1422 |
|
ecb49d1a6 hrtimers: Convert... |
1423 |
raw_spin_lock(&cpu_base->lock); |
c0a313296 [PATCH] hrtimer: ... |
1424 |
|
b007c389d hrtimer: fix time... |
1425 |
while ((node = timerqueue_getnext(&base->active))) { |
833883d9a hrtimer: reduce c... |
1426 |
struct hrtimer *timer; |
54cdfdb47 [PATCH] hrtimers:... |
1427 |
|
998adc3dd hrtimers: Convert... |
1428 |
timer = container_of(node, struct hrtimer, node); |
cc584b213 hrtimer: convert ... |
1429 1430 |
if (base->softirq_time.tv64 <= hrtimer_get_expires_tv64(timer)) |
833883d9a hrtimer: reduce c... |
1431 |
break; |
c6a2a1770 hrtimer: Add trac... |
1432 |
__run_hrtimer(timer, &base->softirq_time); |
833883d9a hrtimer: reduce c... |
1433 |
} |
ecb49d1a6 hrtimers: Convert... |
1434 |
raw_spin_unlock(&cpu_base->lock); |
833883d9a hrtimer: reduce c... |
1435 |
} |
c0a313296 [PATCH] hrtimer: ... |
1436 1437 1438 |
} /* |
10c94ec16 [PATCH] hrtimer: ... |
1439 1440 |
* Sleep related functions: */ |
c9cb2e3d7 [PATCH] hrtimers:... |
1441 |
static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) |
00362e33f [PATCH] hrtimer: ... |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 |
{ struct hrtimer_sleeper *t = container_of(timer, struct hrtimer_sleeper, timer); struct task_struct *task = t->task; t->task = NULL; if (task) wake_up_process(task); return HRTIMER_NORESTART; } |
36c8b5868 [PATCH] sched: cl... |
1453 |
void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task) |
00362e33f [PATCH] hrtimer: ... |
1454 1455 1456 1457 |
{ sl->timer.function = hrtimer_wakeup; sl->task = task; } |
2bc481cf4 pktgen: spin usin... |
1458 |
EXPORT_SYMBOL_GPL(hrtimer_init_sleeper); |
00362e33f [PATCH] hrtimer: ... |
1459 |
|
669d7868a [PATCH] hrtimer: ... |
1460 |
static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode) |
432569bb9 [PATCH] hrtimers:... |
1461 |
{ |
669d7868a [PATCH] hrtimer: ... |
1462 |
hrtimer_init_sleeper(t, current); |
10c94ec16 [PATCH] hrtimer: ... |
1463 |
|
432569bb9 [PATCH] hrtimers:... |
1464 1465 |
do { set_current_state(TASK_INTERRUPTIBLE); |
cc584b213 hrtimer: convert ... |
1466 |
hrtimer_start_expires(&t->timer, mode); |
37bb6cb40 hrtimer: unlock h... |
1467 1468 |
if (!hrtimer_active(&t->timer)) t->task = NULL; |
432569bb9 [PATCH] hrtimers:... |
1469 |
|
54cdfdb47 [PATCH] hrtimers:... |
1470 |
if (likely(t->task)) |
b0f8c44f3 nanosleep: use fr... |
1471 |
freezable_schedule(); |
432569bb9 [PATCH] hrtimers:... |
1472 |
|
669d7868a [PATCH] hrtimer: ... |
1473 |
hrtimer_cancel(&t->timer); |
c9cb2e3d7 [PATCH] hrtimers:... |
1474 |
mode = HRTIMER_MODE_ABS; |
669d7868a [PATCH] hrtimer: ... |
1475 1476 |
} while (t->task && !signal_pending(current)); |
432569bb9 [PATCH] hrtimers:... |
1477 |
|
3588a085c hrtimer: fix hrti... |
1478 |
__set_current_state(TASK_RUNNING); |
669d7868a [PATCH] hrtimer: ... |
1479 |
return t->task == NULL; |
10c94ec16 [PATCH] hrtimer: ... |
1480 |
} |
080344b98 hrtimer: fix *rmt... |
1481 1482 1483 1484 |
static int update_rmtp(struct hrtimer *timer, struct timespec __user *rmtp) { struct timespec rmt; ktime_t rem; |
cc584b213 hrtimer: convert ... |
1485 |
rem = hrtimer_expires_remaining(timer); |
080344b98 hrtimer: fix *rmt... |
1486 1487 1488 1489 1490 1491 1492 1493 1494 |
if (rem.tv64 <= 0) return 0; rmt = ktime_to_timespec(rem); if (copy_to_user(rmtp, &rmt, sizeof(*rmtp))) return -EFAULT; return 1; } |
1711ef386 [PATCH] posix-tim... |
1495 |
long __sched hrtimer_nanosleep_restart(struct restart_block *restart) |
10c94ec16 [PATCH] hrtimer: ... |
1496 |
{ |
669d7868a [PATCH] hrtimer: ... |
1497 |
struct hrtimer_sleeper t; |
080344b98 hrtimer: fix *rmt... |
1498 |
struct timespec __user *rmtp; |
237fc6e7a add hrtimer speci... |
1499 |
int ret = 0; |
10c94ec16 [PATCH] hrtimer: ... |
1500 |
|
ab8177bc5 hrtimers: Avoid t... |
1501 |
hrtimer_init_on_stack(&t.timer, restart->nanosleep.clockid, |
237fc6e7a add hrtimer speci... |
1502 |
HRTIMER_MODE_ABS); |
cc584b213 hrtimer: convert ... |
1503 |
hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires); |
10c94ec16 [PATCH] hrtimer: ... |
1504 |
|
c9cb2e3d7 [PATCH] hrtimers:... |
1505 |
if (do_nanosleep(&t, HRTIMER_MODE_ABS)) |
237fc6e7a add hrtimer speci... |
1506 |
goto out; |
10c94ec16 [PATCH] hrtimer: ... |
1507 |
|
029a07e03 hrtimer: use nano... |
1508 |
rmtp = restart->nanosleep.rmtp; |
432569bb9 [PATCH] hrtimers:... |
1509 |
if (rmtp) { |
237fc6e7a add hrtimer speci... |
1510 |
ret = update_rmtp(&t.timer, rmtp); |
080344b98 hrtimer: fix *rmt... |
1511 |
if (ret <= 0) |
237fc6e7a add hrtimer speci... |
1512 |
goto out; |
432569bb9 [PATCH] hrtimers:... |
1513 |
} |
10c94ec16 [PATCH] hrtimer: ... |
1514 |
|
10c94ec16 [PATCH] hrtimer: ... |
1515 |
/* The other values in restart are already filled in */ |
237fc6e7a add hrtimer speci... |
1516 1517 1518 1519 |
ret = -ERESTART_RESTARTBLOCK; out: destroy_hrtimer_on_stack(&t.timer); return ret; |
10c94ec16 [PATCH] hrtimer: ... |
1520 |
} |
080344b98 hrtimer: fix *rmt... |
1521 |
long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, |
10c94ec16 [PATCH] hrtimer: ... |
1522 1523 1524 |
const enum hrtimer_mode mode, const clockid_t clockid) { struct restart_block *restart; |
669d7868a [PATCH] hrtimer: ... |
1525 |
struct hrtimer_sleeper t; |
237fc6e7a add hrtimer speci... |
1526 |
int ret = 0; |
3bd012060 hrtimer: make the... |
1527 1528 1529 |
unsigned long slack; slack = current->timer_slack_ns; |
aab03e05e sched/deadline: A... |
1530 |
if (dl_task(current) || rt_task(current)) |
3bd012060 hrtimer: make the... |
1531 |
slack = 0; |
10c94ec16 [PATCH] hrtimer: ... |
1532 |
|
237fc6e7a add hrtimer speci... |
1533 |
hrtimer_init_on_stack(&t.timer, clockid, mode); |
3bd012060 hrtimer: make the... |
1534 |
hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack); |
432569bb9 [PATCH] hrtimers:... |
1535 |
if (do_nanosleep(&t, mode)) |
237fc6e7a add hrtimer speci... |
1536 |
goto out; |
10c94ec16 [PATCH] hrtimer: ... |
1537 |
|
7978672c4 [PATCH] hrtimers:... |
1538 |
/* Absolute timers do not update the rmtp value and restart: */ |
237fc6e7a add hrtimer speci... |
1539 1540 1541 1542 |
if (mode == HRTIMER_MODE_ABS) { ret = -ERESTARTNOHAND; goto out; } |
10c94ec16 [PATCH] hrtimer: ... |
1543 |
|
432569bb9 [PATCH] hrtimers:... |
1544 |
if (rmtp) { |
237fc6e7a add hrtimer speci... |
1545 |
ret = update_rmtp(&t.timer, rmtp); |
080344b98 hrtimer: fix *rmt... |
1546 |
if (ret <= 0) |
237fc6e7a add hrtimer speci... |
1547 |
goto out; |
432569bb9 [PATCH] hrtimers:... |
1548 |
} |
10c94ec16 [PATCH] hrtimer: ... |
1549 1550 |
restart = ¤t_thread_info()->restart_block; |
1711ef386 [PATCH] posix-tim... |
1551 |
restart->fn = hrtimer_nanosleep_restart; |
ab8177bc5 hrtimers: Avoid t... |
1552 |
restart->nanosleep.clockid = t.timer.base->clockid; |
029a07e03 hrtimer: use nano... |
1553 |
restart->nanosleep.rmtp = rmtp; |
cc584b213 hrtimer: convert ... |
1554 |
restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer); |
10c94ec16 [PATCH] hrtimer: ... |
1555 |
|
237fc6e7a add hrtimer speci... |
1556 1557 1558 1559 |
ret = -ERESTART_RESTARTBLOCK; out: destroy_hrtimer_on_stack(&t.timer); return ret; |
10c94ec16 [PATCH] hrtimer: ... |
1560 |
} |
58fd3aa28 [CVE-2009-0029] S... |
1561 1562 |
SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp, struct timespec __user *, rmtp) |
6ba1b9121 [PATCH] hrtimer: ... |
1563 |
{ |
080344b98 hrtimer: fix *rmt... |
1564 |
struct timespec tu; |
6ba1b9121 [PATCH] hrtimer: ... |
1565 1566 1567 1568 1569 1570 |
if (copy_from_user(&tu, rqtp, sizeof(tu))) return -EFAULT; if (!timespec_valid(&tu)) return -EINVAL; |
080344b98 hrtimer: fix *rmt... |
1571 |
return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC); |
6ba1b9121 [PATCH] hrtimer: ... |
1572 |
} |
10c94ec16 [PATCH] hrtimer: ... |
1573 |
/* |
c0a313296 [PATCH] hrtimer: ... |
1574 1575 |
* Functions related to boot-time initialization: */ |
0db0628d9 kernel: delete __... |
1576 |
static void init_hrtimers_cpu(int cpu) |
c0a313296 [PATCH] hrtimer: ... |
1577 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
1578 |
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu); |
c0a313296 [PATCH] hrtimer: ... |
1579 |
int i; |
998adc3dd hrtimers: Convert... |
1580 |
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
3c8aa39d7 [PATCH] hrtimers:... |
1581 |
cpu_base->clock_base[i].cpu_base = cpu_base; |
998adc3dd hrtimers: Convert... |
1582 1583 |
timerqueue_init_head(&cpu_base->clock_base[i].active); } |
3c8aa39d7 [PATCH] hrtimers:... |
1584 |
|
54cdfdb47 [PATCH] hrtimers:... |
1585 |
hrtimer_init_hres(cpu_base); |
c0a313296 [PATCH] hrtimer: ... |
1586 1587 1588 |
} #ifdef CONFIG_HOTPLUG_CPU |
ca109491f hrtimer: removing... |
1589 |
static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, |
37810659e hrtimer: removing... |
1590 |
struct hrtimer_clock_base *new_base) |
c0a313296 [PATCH] hrtimer: ... |
1591 1592 |
{ struct hrtimer *timer; |
998adc3dd hrtimers: Convert... |
1593 |
struct timerqueue_node *node; |
c0a313296 [PATCH] hrtimer: ... |
1594 |
|
998adc3dd hrtimers: Convert... |
1595 1596 |
while ((node = timerqueue_getnext(&old_base->active))) { timer = container_of(node, struct hrtimer, node); |
54cdfdb47 [PATCH] hrtimers:... |
1597 |
BUG_ON(hrtimer_callback_running(timer)); |
c6a2a1770 hrtimer: Add trac... |
1598 |
debug_deactivate(timer); |
b00c1a99e hrtimer: mark mig... |
1599 1600 1601 1602 1603 1604 1605 |
/* * Mark it as STATE_MIGRATE not INACTIVE otherwise the * timer could be seen as !active and just vanish away * under us on another CPU */ __remove_hrtimer(timer, old_base, HRTIMER_STATE_MIGRATE, 0); |
c0a313296 [PATCH] hrtimer: ... |
1606 |
timer->base = new_base; |
54cdfdb47 [PATCH] hrtimers:... |
1607 |
/* |
e3f1d8837 hrtimer: fixup co... |
1608 1609 1610 1611 1612 1613 |
* Enqueue the timers on the new cpu. This does not * reprogram the event device in case the timer * expires before the earliest on this CPU, but we run * hrtimer_interrupt after we migrated everything to * sort out already expired timers and reprogram the * event device. |
54cdfdb47 [PATCH] hrtimers:... |
1614 |
*/ |
a6037b61c hrtimer: fix recu... |
1615 |
enqueue_hrtimer(timer, new_base); |
41e1022ea hrtimer: fix migr... |
1616 |
|
b00c1a99e hrtimer: mark mig... |
1617 1618 |
/* Clear the migration state bit */ timer->state &= ~HRTIMER_STATE_MIGRATE; |
c0a313296 [PATCH] hrtimer: ... |
1619 1620 |
} } |
d5fd43c4a hrtimer: fix HOTP... |
1621 |
static void migrate_hrtimers(int scpu) |
c0a313296 [PATCH] hrtimer: ... |
1622 |
{ |
3c8aa39d7 [PATCH] hrtimers:... |
1623 |
struct hrtimer_cpu_base *old_base, *new_base; |
731a55ba0 hrtimer: simplify... |
1624 |
int i; |
c0a313296 [PATCH] hrtimer: ... |
1625 |
|
37810659e hrtimer: removing... |
1626 |
BUG_ON(cpu_online(scpu)); |
37810659e hrtimer: removing... |
1627 |
tick_cancel_sched_timer(scpu); |
731a55ba0 hrtimer: simplify... |
1628 1629 1630 1631 |
local_irq_disable(); old_base = &per_cpu(hrtimer_bases, scpu); new_base = &__get_cpu_var(hrtimer_bases); |
d82f0b0f6 migrate_timers: a... |
1632 1633 1634 1635 |
/* * The caller is globally serialized and nobody else * takes two locks at once, deadlock is not possible. */ |
ecb49d1a6 hrtimers: Convert... |
1636 1637 |
raw_spin_lock(&new_base->lock); raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING); |
c0a313296 [PATCH] hrtimer: ... |
1638 |
|
3c8aa39d7 [PATCH] hrtimers:... |
1639 |
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) { |
ca109491f hrtimer: removing... |
1640 |
migrate_hrtimer_list(&old_base->clock_base[i], |
37810659e hrtimer: removing... |
1641 |
&new_base->clock_base[i]); |
c0a313296 [PATCH] hrtimer: ... |
1642 |
} |
ecb49d1a6 hrtimers: Convert... |
1643 1644 |
raw_spin_unlock(&old_base->lock); raw_spin_unlock(&new_base->lock); |
37810659e hrtimer: removing... |
1645 |
|
731a55ba0 hrtimer: simplify... |
1646 1647 1648 |
/* Check, if we got expired work to do */ __hrtimer_peek_ahead_timers(); local_irq_enable(); |
c0a313296 [PATCH] hrtimer: ... |
1649 |
} |
37810659e hrtimer: removing... |
1650 |
|
c0a313296 [PATCH] hrtimer: ... |
1651 |
#endif /* CONFIG_HOTPLUG_CPU */ |
0db0628d9 kernel: delete __... |
1652 |
static int hrtimer_cpu_notify(struct notifier_block *self, |
c0a313296 [PATCH] hrtimer: ... |
1653 1654 |
unsigned long action, void *hcpu) { |
b2e3c0ade hrtimers: fix war... |
1655 |
int scpu = (long)hcpu; |
c0a313296 [PATCH] hrtimer: ... |
1656 1657 1658 1659 |
switch (action) { case CPU_UP_PREPARE: |
8bb784428 Add suspend-relat... |
1660 |
case CPU_UP_PREPARE_FROZEN: |
37810659e hrtimer: removing... |
1661 |
init_hrtimers_cpu(scpu); |
c0a313296 [PATCH] hrtimer: ... |
1662 1663 1664 |
break; #ifdef CONFIG_HOTPLUG_CPU |
94df7de02 hrtimers: allow t... |
1665 1666 1667 1668 |
case CPU_DYING: case CPU_DYING_FROZEN: clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DYING, &scpu); break; |
c0a313296 [PATCH] hrtimer: ... |
1669 |
case CPU_DEAD: |
8bb784428 Add suspend-relat... |
1670 |
case CPU_DEAD_FROZEN: |
b2e3c0ade hrtimers: fix war... |
1671 |
{ |
37810659e hrtimer: removing... |
1672 |
clockevents_notify(CLOCK_EVT_NOTIFY_CPU_DEAD, &scpu); |
d5fd43c4a hrtimer: fix HOTP... |
1673 |
migrate_hrtimers(scpu); |
c0a313296 [PATCH] hrtimer: ... |
1674 |
break; |
b2e3c0ade hrtimers: fix war... |
1675 |
} |
c0a313296 [PATCH] hrtimer: ... |
1676 1677 1678 1679 1680 1681 1682 1683 |
#endif default: break; } return NOTIFY_OK; } |
0db0628d9 kernel: delete __... |
1684 |
static struct notifier_block hrtimers_nb = { |
c0a313296 [PATCH] hrtimer: ... |
1685 1686 1687 1688 1689 1690 1691 1692 |
.notifier_call = hrtimer_cpu_notify, }; void __init hrtimers_init(void) { hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE, (void *)(long)smp_processor_id()); register_cpu_notifier(&hrtimers_nb); |
a6037b61c hrtimer: fix recu... |
1693 1694 1695 |
#ifdef CONFIG_HIGH_RES_TIMERS open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq); #endif |
c0a313296 [PATCH] hrtimer: ... |
1696 |
} |
7bb67439b select: Introduce... |
1697 |
/** |
351b3f7a2 hrtimers: Provide... |
1698 |
* schedule_hrtimeout_range_clock - sleep until timeout |
7bb67439b select: Introduce... |
1699 |
* @expires: timeout value (ktime_t) |
654c8e0b1 hrtimer: turn hrt... |
1700 |
* @delta: slack in expires timeout (ktime_t) |
7bb67439b select: Introduce... |
1701 |
* @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL |
351b3f7a2 hrtimers: Provide... |
1702 |
* @clock: timer clock, CLOCK_MONOTONIC or CLOCK_REALTIME |
7bb67439b select: Introduce... |
1703 |
*/ |
351b3f7a2 hrtimers: Provide... |
1704 1705 1706 |
int __sched schedule_hrtimeout_range_clock(ktime_t *expires, unsigned long delta, const enum hrtimer_mode mode, int clock) |
7bb67439b select: Introduce... |
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 |
{ struct hrtimer_sleeper t; /* * Optimize when a zero timeout value is given. It does not * matter whether this is an absolute or a relative time. */ if (expires && !expires->tv64) { __set_current_state(TASK_RUNNING); return 0; } /* |
43b210139 hrtimer: fix a ty... |
1720 |
* A NULL parameter means "infinite" |
7bb67439b select: Introduce... |
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*/ if (!expires) { schedule(); __set_current_state(TASK_RUNNING); return -EINTR; } |
351b3f7a2 hrtimers: Provide... |
1727 |
hrtimer_init_on_stack(&t.timer, clock, mode); |
654c8e0b1 hrtimer: turn hrt... |
1728 |
hrtimer_set_expires_range_ns(&t.timer, *expires, delta); |
7bb67439b select: Introduce... |
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hrtimer_init_sleeper(&t, current); |
cc584b213 hrtimer: convert ... |
1731 |
hrtimer_start_expires(&t.timer, mode); |
7bb67439b select: Introduce... |
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if (!hrtimer_active(&t.timer)) t.task = NULL; if (likely(t.task)) schedule(); hrtimer_cancel(&t.timer); destroy_hrtimer_on_stack(&t.timer); __set_current_state(TASK_RUNNING); return !t.task ? 0 : -EINTR; } |
351b3f7a2 hrtimers: Provide... |
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/** * schedule_hrtimeout_range - sleep until timeout * @expires: timeout value (ktime_t) * @delta: slack in expires timeout (ktime_t) * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL * * Make the current task sleep until the given expiry time has * elapsed. The routine will return immediately unless * the current task state has been set (see set_current_state()). * * The @delta argument gives the kernel the freedom to schedule the * actual wakeup to a time that is both power and performance friendly. * The kernel give the normal best effort behavior for "@expires+@delta", * but may decide to fire the timer earlier, but no earlier than @expires. * * You can set the task state as follows - * * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to * pass before the routine returns. * * %TASK_INTERRUPTIBLE - the routine may return early if a signal is * delivered to the current task. * * The current task state is guaranteed to be TASK_RUNNING when this * routine returns. * * Returns 0 when the timer has expired otherwise -EINTR */ int __sched schedule_hrtimeout_range(ktime_t *expires, unsigned long delta, const enum hrtimer_mode mode) { return schedule_hrtimeout_range_clock(expires, delta, mode, CLOCK_MONOTONIC); } |
654c8e0b1 hrtimer: turn hrt... |
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EXPORT_SYMBOL_GPL(schedule_hrtimeout_range); /** * schedule_hrtimeout - sleep until timeout * @expires: timeout value (ktime_t) * @mode: timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL * * Make the current task sleep until the given expiry time has * elapsed. The routine will return immediately unless * the current task state has been set (see set_current_state()). * * You can set the task state as follows - * * %TASK_UNINTERRUPTIBLE - at least @timeout time is guaranteed to * pass before the routine returns. * * %TASK_INTERRUPTIBLE - the routine may return early if a signal is * delivered to the current task. * * The current task state is guaranteed to be TASK_RUNNING when this * routine returns. * * Returns 0 when the timer has expired otherwise -EINTR */ int __sched schedule_hrtimeout(ktime_t *expires, const enum hrtimer_mode mode) { return schedule_hrtimeout_range(expires, 0, mode); } |
7bb67439b select: Introduce... |
1809 |
EXPORT_SYMBOL_GPL(schedule_hrtimeout); |