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kernel/timer.c
40.9 KB
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/* * linux/kernel/timer.c * |
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* Kernel internal timers, basic process system calls |
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* * Copyright (C) 1991, 1992 Linus Torvalds * * 1997-01-28 Modified by Finn Arne Gangstad to make timers scale better. * * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 * "A Kernel Model for Precision Timekeeping" by Dave Mills * 1998-12-24 Fixed a xtime SMP race (we need the xtime_lock rw spinlock to * serialize accesses to xtime/lost_ticks). * Copyright (C) 1998 Andrea Arcangeli * 1999-03-10 Improved NTP compatibility by Ulrich Windl * 2002-05-31 Move sys_sysinfo here and make its locking sane, Robert Love * 2000-10-05 Implemented scalable SMP per-CPU timer handling. * Copyright (C) 2000, 2001, 2002 Ingo Molnar * Designed by David S. Miller, Alexey Kuznetsov and Ingo Molnar */ #include <linux/kernel_stat.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/percpu.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/notifier.h> #include <linux/thread_info.h> #include <linux/time.h> #include <linux/jiffies.h> #include <linux/posix-timers.h> #include <linux/cpu.h> #include <linux/syscalls.h> |
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#include <linux/delay.h> |
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#include <linux/tick.h> |
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#include <linux/kallsyms.h> |
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#include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/div64.h> #include <asm/timex.h> #include <asm/io.h> |
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u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES; EXPORT_SYMBOL(jiffies_64); |
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/* * per-CPU timer vector definitions: */ |
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#define TVN_BITS (CONFIG_BASE_SMALL ? 4 : 6) #define TVR_BITS (CONFIG_BASE_SMALL ? 6 : 8) #define TVN_SIZE (1 << TVN_BITS) #define TVR_SIZE (1 << TVR_BITS) #define TVN_MASK (TVN_SIZE - 1) #define TVR_MASK (TVR_SIZE - 1) typedef struct tvec_s { struct list_head vec[TVN_SIZE]; } tvec_t; typedef struct tvec_root_s { struct list_head vec[TVR_SIZE]; } tvec_root_t; struct tvec_t_base_s { |
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spinlock_t lock; struct timer_list *running_timer; |
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unsigned long timer_jiffies; |
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tvec_root_t tv1; tvec_t tv2; tvec_t tv3; tvec_t tv4; tvec_t tv5; |
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} ____cacheline_aligned; |
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typedef struct tvec_t_base_s tvec_base_t; |
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tvec_base_t boot_tvec_bases; EXPORT_SYMBOL(boot_tvec_bases); |
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static DEFINE_PER_CPU(tvec_base_t *, tvec_bases) = &boot_tvec_bases; |
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/* * Note that all tvec_bases is 2 byte aligned and lower bit of * base in timer_list is guaranteed to be zero. Use the LSB for * the new flag to indicate whether the timer is deferrable */ #define TBASE_DEFERRABLE_FLAG (0x1) /* Functions below help us manage 'deferrable' flag */ static inline unsigned int tbase_get_deferrable(tvec_base_t *base) { |
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return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG); |
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} static inline tvec_base_t *tbase_get_base(tvec_base_t *base) { |
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return ((tvec_base_t *)((unsigned long)base & ~TBASE_DEFERRABLE_FLAG)); |
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} static inline void timer_set_deferrable(struct timer_list *timer) { |
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timer->base = ((tvec_base_t *)((unsigned long)(timer->base) | |
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TBASE_DEFERRABLE_FLAG)); |
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} static inline void timer_set_base(struct timer_list *timer, tvec_base_t *new_base) { |
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timer->base = (tvec_base_t *)((unsigned long)(new_base) | |
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tbase_get_deferrable(timer->base)); |
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} |
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/** * __round_jiffies - function to round jiffies to a full second * @j: the time in (absolute) jiffies that should be rounded * @cpu: the processor number on which the timeout will happen * |
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* __round_jiffies() rounds an absolute time in the future (in jiffies) |
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* up or down to (approximately) full seconds. This is useful for timers * for which the exact time they fire does not matter too much, as long as * they fire approximately every X seconds. * * By rounding these timers to whole seconds, all such timers will fire * at the same time, rather than at various times spread out. The goal * of this is to have the CPU wake up less, which saves power. * * The exact rounding is skewed for each processor to avoid all * processors firing at the exact same time, which could lead * to lock contention or spurious cache line bouncing. * |
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* The return value is the rounded version of the @j parameter. |
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*/ unsigned long __round_jiffies(unsigned long j, int cpu) { int rem; unsigned long original = j; /* * We don't want all cpus firing their timers at once hitting the * same lock or cachelines, so we skew each extra cpu with an extra * 3 jiffies. This 3 jiffies came originally from the mm/ code which * already did this. * The skew is done by adding 3*cpunr, then round, then subtract this * extra offset again. */ j += cpu * 3; rem = j % HZ; /* * If the target jiffie is just after a whole second (which can happen * due to delays of the timer irq, long irq off times etc etc) then * we should round down to the whole second, not up. Use 1/4th second * as cutoff for this rounding as an extreme upper bound for this. */ if (rem < HZ/4) /* round down */ j = j - rem; else /* round up */ j = j - rem + HZ; /* now that we have rounded, subtract the extra skew again */ j -= cpu * 3; if (j <= jiffies) /* rounding ate our timeout entirely; */ return original; return j; } EXPORT_SYMBOL_GPL(__round_jiffies); /** * __round_jiffies_relative - function to round jiffies to a full second * @j: the time in (relative) jiffies that should be rounded * @cpu: the processor number on which the timeout will happen * |
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* __round_jiffies_relative() rounds a time delta in the future (in jiffies) |
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* up or down to (approximately) full seconds. This is useful for timers * for which the exact time they fire does not matter too much, as long as * they fire approximately every X seconds. * * By rounding these timers to whole seconds, all such timers will fire * at the same time, rather than at various times spread out. The goal * of this is to have the CPU wake up less, which saves power. * * The exact rounding is skewed for each processor to avoid all * processors firing at the exact same time, which could lead * to lock contention or spurious cache line bouncing. * |
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* The return value is the rounded version of the @j parameter. |
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*/ unsigned long __round_jiffies_relative(unsigned long j, int cpu) { /* * In theory the following code can skip a jiffy in case jiffies * increments right between the addition and the later subtraction. * However since the entire point of this function is to use approximate * timeouts, it's entirely ok to not handle that. */ return __round_jiffies(j + jiffies, cpu) - jiffies; } EXPORT_SYMBOL_GPL(__round_jiffies_relative); /** * round_jiffies - function to round jiffies to a full second * @j: the time in (absolute) jiffies that should be rounded * |
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* round_jiffies() rounds an absolute time in the future (in jiffies) |
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* up or down to (approximately) full seconds. This is useful for timers * for which the exact time they fire does not matter too much, as long as * they fire approximately every X seconds. * * By rounding these timers to whole seconds, all such timers will fire * at the same time, rather than at various times spread out. The goal * of this is to have the CPU wake up less, which saves power. * |
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* The return value is the rounded version of the @j parameter. |
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*/ unsigned long round_jiffies(unsigned long j) { return __round_jiffies(j, raw_smp_processor_id()); } EXPORT_SYMBOL_GPL(round_jiffies); /** * round_jiffies_relative - function to round jiffies to a full second * @j: the time in (relative) jiffies that should be rounded * |
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* round_jiffies_relative() rounds a time delta in the future (in jiffies) |
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* up or down to (approximately) full seconds. This is useful for timers * for which the exact time they fire does not matter too much, as long as * they fire approximately every X seconds. * * By rounding these timers to whole seconds, all such timers will fire * at the same time, rather than at various times spread out. The goal * of this is to have the CPU wake up less, which saves power. * |
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* The return value is the rounded version of the @j parameter. |
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*/ unsigned long round_jiffies_relative(unsigned long j) { return __round_jiffies_relative(j, raw_smp_processor_id()); } EXPORT_SYMBOL_GPL(round_jiffies_relative); |
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static inline void set_running_timer(tvec_base_t *base, struct timer_list *timer) { #ifdef CONFIG_SMP |
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base->running_timer = timer; |
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#endif } |
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static void internal_add_timer(tvec_base_t *base, struct timer_list *timer) { unsigned long expires = timer->expires; unsigned long idx = expires - base->timer_jiffies; struct list_head *vec; if (idx < TVR_SIZE) { int i = expires & TVR_MASK; vec = base->tv1.vec + i; } else if (idx < 1 << (TVR_BITS + TVN_BITS)) { int i = (expires >> TVR_BITS) & TVN_MASK; vec = base->tv2.vec + i; } else if (idx < 1 << (TVR_BITS + 2 * TVN_BITS)) { int i = (expires >> (TVR_BITS + TVN_BITS)) & TVN_MASK; vec = base->tv3.vec + i; } else if (idx < 1 << (TVR_BITS + 3 * TVN_BITS)) { int i = (expires >> (TVR_BITS + 2 * TVN_BITS)) & TVN_MASK; vec = base->tv4.vec + i; } else if ((signed long) idx < 0) { /* * Can happen if you add a timer with expires == jiffies, * or you set a timer to go off in the past */ vec = base->tv1.vec + (base->timer_jiffies & TVR_MASK); } else { int i; /* If the timeout is larger than 0xffffffff on 64-bit * architectures then we use the maximum timeout: */ if (idx > 0xffffffffUL) { idx = 0xffffffffUL; expires = idx + base->timer_jiffies; } i = (expires >> (TVR_BITS + 3 * TVN_BITS)) & TVN_MASK; vec = base->tv5.vec + i; } /* * Timers are FIFO: */ list_add_tail(&timer->entry, vec); } |
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#ifdef CONFIG_TIMER_STATS void __timer_stats_timer_set_start_info(struct timer_list *timer, void *addr) { if (timer->start_site) return; timer->start_site = addr; memcpy(timer->start_comm, current->comm, TASK_COMM_LEN); timer->start_pid = current->pid; } |
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static void timer_stats_account_timer(struct timer_list *timer) { unsigned int flag = 0; if (unlikely(tbase_get_deferrable(timer->base))) flag |= TIMER_STATS_FLAG_DEFERRABLE; timer_stats_update_stats(timer, timer->start_pid, timer->start_site, timer->function, timer->start_comm, flag); } #else static void timer_stats_account_timer(struct timer_list *timer) {} |
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#endif |
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/** |
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* init_timer - initialize a timer. * @timer: the timer to be initialized * * init_timer() must be done to a timer prior calling *any* of the * other timer functions. */ void fastcall init_timer(struct timer_list *timer) { timer->entry.next = NULL; |
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timer->base = __raw_get_cpu_var(tvec_bases); |
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#ifdef CONFIG_TIMER_STATS timer->start_site = NULL; timer->start_pid = -1; memset(timer->start_comm, 0, TASK_COMM_LEN); #endif |
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} EXPORT_SYMBOL(init_timer); |
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void fastcall init_timer_deferrable(struct timer_list *timer) { init_timer(timer); timer_set_deferrable(timer); } EXPORT_SYMBOL(init_timer_deferrable); |
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static inline void detach_timer(struct timer_list *timer, |
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int clear_pending) |
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{ struct list_head *entry = &timer->entry; __list_del(entry->prev, entry->next); if (clear_pending) entry->next = NULL; entry->prev = LIST_POISON2; } /* |
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* We are using hashed locking: holding per_cpu(tvec_bases).lock |
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* 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 ->tvX lists. * * 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 tvec_base_t *lock_timer_base(struct timer_list *timer, |
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unsigned long *flags) |
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__acquires(timer->base->lock) |
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{ |
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tvec_base_t *base; |
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for (;;) { |
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tvec_base_t *prelock_base = timer->base; base = tbase_get_base(prelock_base); |
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if (likely(base != NULL)) { spin_lock_irqsave(&base->lock, *flags); |
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if (likely(prelock_base == timer->base)) |
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return base; /* The timer has migrated to another CPU */ spin_unlock_irqrestore(&base->lock, *flags); } cpu_relax(); } } |
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int __mod_timer(struct timer_list *timer, unsigned long expires) { |
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tvec_base_t *base, *new_base; |
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unsigned long flags; int ret = 0; |
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timer_stats_timer_set_start_info(timer); |
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BUG_ON(!timer->function); |
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|
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base = lock_timer_base(timer, &flags); if (timer_pending(timer)) { detach_timer(timer, 0); ret = 1; } |
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new_base = __get_cpu_var(tvec_bases); |
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|
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if (base != new_base) { |
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/* |
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* We are trying to schedule the timer on the local CPU. * However we can't change timer's base while it is running, * otherwise del_timer_sync() can't detect that the timer's * handler yet has not finished. This also guarantees that * the timer is serialized wrt itself. |
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*/ |
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if (likely(base->running_timer != timer)) { |
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/* See the comment in lock_timer_base() */ |
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timer_set_base(timer, NULL); |
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spin_unlock(&base->lock); |
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base = new_base; spin_lock(&base->lock); |
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timer_set_base(timer, base); |
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} } |
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timer->expires = expires; |
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internal_add_timer(base, timer); spin_unlock_irqrestore(&base->lock, flags); |
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return ret; } EXPORT_SYMBOL(__mod_timer); |
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/** |
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* add_timer_on - start a timer on a particular CPU * @timer: the timer to be added * @cpu: the CPU to start it on * * This is not very scalable on SMP. Double adds are not possible. */ void add_timer_on(struct timer_list *timer, int cpu) { |
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tvec_base_t *base = per_cpu(tvec_bases, cpu); |
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unsigned long flags; |
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|
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timer_stats_timer_set_start_info(timer); |
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BUG_ON(timer_pending(timer) || !timer->function); |
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spin_lock_irqsave(&base->lock, flags); |
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timer_set_base(timer, base); |
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internal_add_timer(base, timer); |
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spin_unlock_irqrestore(&base->lock, flags); |
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} |
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/** |
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* mod_timer - modify a timer's timeout * @timer: the timer to be modified |
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* @expires: new timeout in jiffies |
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* |
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* mod_timer() is a more efficient way to update the expire field of an |
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* active timer (if the timer is inactive it will be activated) * * mod_timer(timer, expires) is equivalent to: * * del_timer(timer); timer->expires = expires; add_timer(timer); * * Note that if there are multiple unserialized concurrent users of the * same timer, then mod_timer() is the only safe way to modify the timeout, * since add_timer() cannot modify an already running timer. * * The function returns whether it has modified a pending timer or not. * (ie. mod_timer() of an inactive timer returns 0, mod_timer() of an * active timer returns 1.) */ int mod_timer(struct timer_list *timer, unsigned long expires) { BUG_ON(!timer->function); |
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timer_stats_timer_set_start_info(timer); |
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/* * This is a common optimization triggered by the * networking code - if the timer is re-modified * to be the same thing then just return: */ if (timer->expires == expires && timer_pending(timer)) return 1; return __mod_timer(timer, expires); } EXPORT_SYMBOL(mod_timer); |
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/** |
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* del_timer - deactive a timer. * @timer: the timer to be deactivated * * del_timer() deactivates a timer - this works on both active and inactive * timers. * * The function returns whether it has deactivated a pending timer or not. * (ie. del_timer() of an inactive timer returns 0, del_timer() of an * active timer returns 1.) */ int del_timer(struct timer_list *timer) { |
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tvec_base_t *base; |
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unsigned long flags; |
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int ret = 0; |
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|
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timer_stats_timer_clear_start_info(timer); |
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if (timer_pending(timer)) { base = lock_timer_base(timer, &flags); if (timer_pending(timer)) { detach_timer(timer, 1); ret = 1; } |
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spin_unlock_irqrestore(&base->lock, flags); |
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} |
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|
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return ret; |
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} EXPORT_SYMBOL(del_timer); #ifdef CONFIG_SMP |
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/** * try_to_del_timer_sync - Try to deactivate a timer * @timer: timer do del * |
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* This function tries to deactivate a timer. Upon successful (ret >= 0) * exit the timer is not queued and the handler is not running on any CPU. * * It must not be called from interrupt contexts. */ int try_to_del_timer_sync(struct timer_list *timer) { |
3691c5199 [PATCH] kill __in... |
522 |
tvec_base_t *base; |
fd450b731 [PATCH] timers: i... |
523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
unsigned long flags; int ret = -1; base = lock_timer_base(timer, &flags); if (base->running_timer == timer) goto out; ret = 0; if (timer_pending(timer)) { detach_timer(timer, 1); ret = 1; } out: spin_unlock_irqrestore(&base->lock, flags); return ret; } |
e19dff1fd [AF_RXRPC]: Make ... |
541 |
EXPORT_SYMBOL(try_to_del_timer_sync); |
2aae4a108 [PATCH] Fix kerne... |
542 |
/** |
1da177e4c Linux-2.6.12-rc2 |
543 544 545 546 547 548 549 |
* del_timer_sync - deactivate a timer and wait for the handler to finish. * @timer: the timer to be deactivated * * This function only differs from del_timer() on SMP: besides deactivating * the timer it also makes sure the handler has finished executing on other * CPUs. * |
72fd4a35a [PATCH] Numerous ... |
550 |
* Synchronization rules: Callers must prevent restarting of the timer, |
1da177e4c Linux-2.6.12-rc2 |
551 552 |
* otherwise this function is meaningless. It must not be called from * interrupt contexts. The caller must not hold locks which would prevent |
55c888d6d [PATCH] timers fi... |
553 554 555 |
* completion of the timer's handler. The timer's handler must not call * add_timer_on(). Upon exit the timer is not queued and the handler is * not running on any CPU. |
1da177e4c Linux-2.6.12-rc2 |
556 557 |
* * The function returns whether it has deactivated a pending timer or not. |
1da177e4c Linux-2.6.12-rc2 |
558 559 560 |
*/ int del_timer_sync(struct timer_list *timer) { |
fd450b731 [PATCH] timers: i... |
561 562 563 564 |
for (;;) { int ret = try_to_del_timer_sync(timer); if (ret >= 0) return ret; |
a0009652a [PATCH] del_timer... |
565 |
cpu_relax(); |
fd450b731 [PATCH] timers: i... |
566 |
} |
1da177e4c Linux-2.6.12-rc2 |
567 |
} |
1da177e4c Linux-2.6.12-rc2 |
568 |
|
55c888d6d [PATCH] timers fi... |
569 |
EXPORT_SYMBOL(del_timer_sync); |
1da177e4c Linux-2.6.12-rc2 |
570 571 572 573 574 |
#endif static int cascade(tvec_base_t *base, tvec_t *tv, int index) { /* cascade all the timers from tv up one level */ |
3439dd86e [PATCH] When CONF... |
575 576 577 578 |
struct timer_list *timer, *tmp; struct list_head tv_list; list_replace_init(tv->vec + index, &tv_list); |
1da177e4c Linux-2.6.12-rc2 |
579 |
|
1da177e4c Linux-2.6.12-rc2 |
580 |
/* |
3439dd86e [PATCH] When CONF... |
581 582 |
* We are removing _all_ timers from the list, so we * don't have to detach them individually. |
1da177e4c Linux-2.6.12-rc2 |
583 |
*/ |
3439dd86e [PATCH] When CONF... |
584 |
list_for_each_entry_safe(timer, tmp, &tv_list, entry) { |
6e453a675 Add support for d... |
585 |
BUG_ON(tbase_get_base(timer->base) != base); |
3439dd86e [PATCH] When CONF... |
586 |
internal_add_timer(base, timer); |
1da177e4c Linux-2.6.12-rc2 |
587 |
} |
1da177e4c Linux-2.6.12-rc2 |
588 589 590 |
return index; } |
2aae4a108 [PATCH] Fix kerne... |
591 592 593 |
#define INDEX(N) ((base->timer_jiffies >> (TVR_BITS + (N) * TVN_BITS)) & TVN_MASK) /** |
1da177e4c Linux-2.6.12-rc2 |
594 595 596 597 598 599 |
* __run_timers - run all expired timers (if any) on this CPU. * @base: the timer vector to be processed. * * This function cascades all vectors and executes all expired timer * vectors. */ |
1da177e4c Linux-2.6.12-rc2 |
600 601 602 |
static inline void __run_timers(tvec_base_t *base) { struct timer_list *timer; |
3691c5199 [PATCH] kill __in... |
603 |
spin_lock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
604 |
while (time_after_eq(jiffies, base->timer_jiffies)) { |
626ab0e69 [PATCH] list: use... |
605 |
struct list_head work_list; |
1da177e4c Linux-2.6.12-rc2 |
606 |
struct list_head *head = &work_list; |
6819457d2 timer.c: cleanup ... |
607 |
int index = base->timer_jiffies & TVR_MASK; |
626ab0e69 [PATCH] list: use... |
608 |
|
1da177e4c Linux-2.6.12-rc2 |
609 610 611 612 613 614 615 616 |
/* * Cascade timers: */ if (!index && (!cascade(base, &base->tv2, INDEX(0))) && (!cascade(base, &base->tv3, INDEX(1))) && !cascade(base, &base->tv4, INDEX(2))) cascade(base, &base->tv5, INDEX(3)); |
626ab0e69 [PATCH] list: use... |
617 618 |
++base->timer_jiffies; list_replace_init(base->tv1.vec + index, &work_list); |
55c888d6d [PATCH] timers fi... |
619 |
while (!list_empty(head)) { |
1da177e4c Linux-2.6.12-rc2 |
620 621 |
void (*fn)(unsigned long); unsigned long data; |
b5e618181 Introduce a handy... |
622 |
timer = list_first_entry(head, struct timer_list,entry); |
6819457d2 timer.c: cleanup ... |
623 624 |
fn = timer->function; data = timer->data; |
1da177e4c Linux-2.6.12-rc2 |
625 |
|
82f67cd9f [PATCH] Add debug... |
626 |
timer_stats_account_timer(timer); |
1da177e4c Linux-2.6.12-rc2 |
627 |
set_running_timer(base, timer); |
55c888d6d [PATCH] timers fi... |
628 |
detach_timer(timer, 1); |
3691c5199 [PATCH] kill __in... |
629 |
spin_unlock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
630 |
{ |
be5b4fbd0 [PATCH] preempt_c... |
631 |
int preempt_count = preempt_count(); |
1da177e4c Linux-2.6.12-rc2 |
632 633 |
fn(data); if (preempt_count != preempt_count()) { |
be5b4fbd0 [PATCH] preempt_c... |
634 635 636 637 638 639 |
printk(KERN_WARNING "huh, entered %p " "with preempt_count %08x, exited" " with %08x? ", fn, preempt_count, preempt_count()); |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 |
BUG(); } } |
3691c5199 [PATCH] kill __in... |
643 |
spin_lock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
644 645 646 |
} } set_running_timer(base, NULL); |
3691c5199 [PATCH] kill __in... |
647 |
spin_unlock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
648 |
} |
fd064b9b7 [PATCH] Extend ne... |
649 |
#if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_NO_HZ) |
1da177e4c Linux-2.6.12-rc2 |
650 651 652 653 654 |
/* * Find out when the next timer event is due to happen. This * is used on S/390 to stop all activity when a cpus is idle. * This functions needs to be called disabled. */ |
1cfd68496 [PATCH] Fix casca... |
655 |
static unsigned long __next_timer_interrupt(tvec_base_t *base) |
1da177e4c Linux-2.6.12-rc2 |
656 |
{ |
1cfd68496 [PATCH] Fix casca... |
657 |
unsigned long timer_jiffies = base->timer_jiffies; |
eaad084bb NOHZ: prevent mul... |
658 |
unsigned long expires = timer_jiffies + NEXT_TIMER_MAX_DELTA; |
1cfd68496 [PATCH] Fix casca... |
659 |
int index, slot, array, found = 0; |
1da177e4c Linux-2.6.12-rc2 |
660 |
struct timer_list *nte; |
1da177e4c Linux-2.6.12-rc2 |
661 |
tvec_t *varray[4]; |
1da177e4c Linux-2.6.12-rc2 |
662 663 |
/* Look for timer events in tv1. */ |
1cfd68496 [PATCH] Fix casca... |
664 |
index = slot = timer_jiffies & TVR_MASK; |
1da177e4c Linux-2.6.12-rc2 |
665 |
do { |
1cfd68496 [PATCH] Fix casca... |
666 |
list_for_each_entry(nte, base->tv1.vec + slot, entry) { |
6819457d2 timer.c: cleanup ... |
667 668 |
if (tbase_get_deferrable(nte->base)) continue; |
6e453a675 Add support for d... |
669 |
|
1cfd68496 [PATCH] Fix casca... |
670 |
found = 1; |
1da177e4c Linux-2.6.12-rc2 |
671 |
expires = nte->expires; |
1cfd68496 [PATCH] Fix casca... |
672 673 674 675 |
/* Look at the cascade bucket(s)? */ if (!index || slot < index) goto cascade; return expires; |
1da177e4c Linux-2.6.12-rc2 |
676 |
} |
1cfd68496 [PATCH] Fix casca... |
677 678 679 680 681 682 683 684 |
slot = (slot + 1) & TVR_MASK; } while (slot != index); cascade: /* Calculate the next cascade event */ if (index) timer_jiffies += TVR_SIZE - index; timer_jiffies >>= TVR_BITS; |
1da177e4c Linux-2.6.12-rc2 |
685 686 687 688 689 690 |
/* Check tv2-tv5. */ varray[0] = &base->tv2; varray[1] = &base->tv3; varray[2] = &base->tv4; varray[3] = &base->tv5; |
1cfd68496 [PATCH] Fix casca... |
691 692 693 694 695 |
for (array = 0; array < 4; array++) { tvec_t *varp = varray[array]; index = slot = timer_jiffies & TVN_MASK; |
1da177e4c Linux-2.6.12-rc2 |
696 |
do { |
1cfd68496 [PATCH] Fix casca... |
697 698 |
list_for_each_entry(nte, varp->vec + slot, entry) { found = 1; |
1da177e4c Linux-2.6.12-rc2 |
699 700 |
if (time_before(nte->expires, expires)) expires = nte->expires; |
1cfd68496 [PATCH] Fix casca... |
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 |
} /* * Do we still search for the first timer or are * we looking up the cascade buckets ? */ if (found) { /* Look at the cascade bucket(s)? */ if (!index || slot < index) break; return expires; } slot = (slot + 1) & TVN_MASK; } while (slot != index); if (index) timer_jiffies += TVN_SIZE - index; timer_jiffies >>= TVN_BITS; |
1da177e4c Linux-2.6.12-rc2 |
718 |
} |
1cfd68496 [PATCH] Fix casca... |
719 720 |
return expires; } |
69239749e [PATCH] fix next_... |
721 |
|
1cfd68496 [PATCH] Fix casca... |
722 723 724 725 726 727 728 729 730 |
/* * Check, if the next hrtimer event is before the next timer wheel * event: */ static unsigned long cmp_next_hrtimer_event(unsigned long now, unsigned long expires) { ktime_t hr_delta = hrtimer_get_next_event(); struct timespec tsdelta; |
9501b6cf5 [PATCH] dynticks:... |
731 |
unsigned long delta; |
1cfd68496 [PATCH] Fix casca... |
732 733 734 |
if (hr_delta.tv64 == KTIME_MAX) return expires; |
0662b7132 [PATCH] Fix a NO_... |
735 |
|
9501b6cf5 [PATCH] dynticks:... |
736 737 738 739 740 |
/* * Expired timer available, let it expire in the next tick */ if (hr_delta.tv64 <= 0) return now + 1; |
69239749e [PATCH] fix next_... |
741 |
|
1cfd68496 [PATCH] Fix casca... |
742 |
tsdelta = ktime_to_timespec(hr_delta); |
9501b6cf5 [PATCH] dynticks:... |
743 |
delta = timespec_to_jiffies(&tsdelta); |
eaad084bb NOHZ: prevent mul... |
744 745 746 747 748 749 750 |
/* * Limit the delta to the max value, which is checked in * tick_nohz_stop_sched_tick(): */ if (delta > NEXT_TIMER_MAX_DELTA) delta = NEXT_TIMER_MAX_DELTA; |
9501b6cf5 [PATCH] dynticks:... |
751 752 753 754 755 756 757 758 759 |
/* * Take rounding errors in to account and make sure, that it * expires in the next tick. Otherwise we go into an endless * ping pong due to tick_nohz_stop_sched_tick() retriggering * the timer softirq */ if (delta < 1) delta = 1; now += delta; |
1cfd68496 [PATCH] Fix casca... |
760 761 |
if (time_before(now, expires)) return now; |
1da177e4c Linux-2.6.12-rc2 |
762 763 |
return expires; } |
1cfd68496 [PATCH] Fix casca... |
764 765 766 |
/** * next_timer_interrupt - return the jiffy of the next pending timer |
05fb6bf0b [PATCH] kernel-do... |
767 |
* @now: current time (in jiffies) |
1cfd68496 [PATCH] Fix casca... |
768 |
*/ |
fd064b9b7 [PATCH] Extend ne... |
769 |
unsigned long get_next_timer_interrupt(unsigned long now) |
1cfd68496 [PATCH] Fix casca... |
770 771 |
{ tvec_base_t *base = __get_cpu_var(tvec_bases); |
fd064b9b7 [PATCH] Extend ne... |
772 |
unsigned long expires; |
1cfd68496 [PATCH] Fix casca... |
773 774 775 776 777 778 779 780 781 782 |
spin_lock(&base->lock); expires = __next_timer_interrupt(base); spin_unlock(&base->lock); if (time_before_eq(expires, now)) return now; return cmp_next_hrtimer_event(now, expires); } |
fd064b9b7 [PATCH] Extend ne... |
783 784 785 786 787 788 789 |
#ifdef CONFIG_NO_IDLE_HZ unsigned long next_timer_interrupt(void) { return get_next_timer_interrupt(jiffies); } #endif |
1da177e4c Linux-2.6.12-rc2 |
790 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 |
/* * Called from the timer interrupt handler to charge one tick to the current * process. user_tick is 1 if the tick is user time, 0 for system. */ void update_process_times(int user_tick) { struct task_struct *p = current; int cpu = smp_processor_id(); /* Note: this timer irq context must be accounted for as well. */ if (user_tick) account_user_time(p, jiffies_to_cputime(1)); else account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1)); run_local_timers(); if (rcu_pending(cpu)) rcu_check_callbacks(cpu, user_tick); scheduler_tick(); |
6819457d2 timer.c: cleanup ... |
809 |
run_posix_cpu_timers(p); |
1da177e4c Linux-2.6.12-rc2 |
810 811 812 813 814 815 816 |
} /* * Nr of active tasks - counted in fixed-point numbers */ static unsigned long count_active_tasks(void) { |
db1b1fefc [PATCH] sched: re... |
817 |
return nr_active() * FIXED_1; |
1da177e4c Linux-2.6.12-rc2 |
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 |
} /* * Hmm.. Changed this, as the GNU make sources (load.c) seems to * imply that avenrun[] is the standard name for this kind of thing. * Nothing else seems to be standardized: the fractional size etc * all seem to differ on different machines. * * Requires xtime_lock to access. */ unsigned long avenrun[3]; EXPORT_SYMBOL(avenrun); /* * calc_load - given tick count, update the avenrun load estimates. * This is called while holding a write_lock on xtime_lock. */ static inline void calc_load(unsigned long ticks) { unsigned long active_tasks; /* fixed-point */ static int count = LOAD_FREQ; |
cd7175edf [PATCH] Optimize ... |
840 841 842 843 844 845 846 847 848 |
count -= ticks; if (unlikely(count < 0)) { active_tasks = count_active_tasks(); do { CALC_LOAD(avenrun[0], EXP_1, active_tasks); CALC_LOAD(avenrun[1], EXP_5, active_tasks); CALC_LOAD(avenrun[2], EXP_15, active_tasks); count += LOAD_FREQ; } while (count < 0); |
1da177e4c Linux-2.6.12-rc2 |
849 850 |
} } |
1da177e4c Linux-2.6.12-rc2 |
851 |
/* |
1da177e4c Linux-2.6.12-rc2 |
852 853 854 855 |
* This function runs timers and the timer-tq in bottom half context. */ static void run_timer_softirq(struct softirq_action *h) { |
a4a6198b8 [PATCH] tvec_base... |
856 |
tvec_base_t *base = __get_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
857 |
|
82f67cd9f [PATCH] Add debug... |
858 |
hrtimer_run_queues(); |
1da177e4c Linux-2.6.12-rc2 |
859 860 861 862 863 864 865 866 867 868 |
if (time_after_eq(jiffies, base->timer_jiffies)) __run_timers(base); } /* * Called by the local, per-CPU timer interrupt on SMP. */ void run_local_timers(void) { raise_softirq(TIMER_SOFTIRQ); |
6687a97d4 [PATCH] timer-irq... |
869 |
softlockup_tick(); |
1da177e4c Linux-2.6.12-rc2 |
870 871 872 873 874 875 |
} /* * Called by the timer interrupt. xtime_lock must already be taken * by the timer IRQ! */ |
3171a0305 [PATCH] simplify ... |
876 |
static inline void update_times(unsigned long ticks) |
1da177e4c Linux-2.6.12-rc2 |
877 |
{ |
ad596171e [PATCH] Time: Use... |
878 |
update_wall_time(); |
1da177e4c Linux-2.6.12-rc2 |
879 880 |
calc_load(ticks); } |
6819457d2 timer.c: cleanup ... |
881 |
|
1da177e4c Linux-2.6.12-rc2 |
882 883 884 885 886 |
/* * The 64-bit jiffies value is not atomic - you MUST NOT read it * without sampling the sequence number in xtime_lock. * jiffies is defined in the linker script... */ |
3171a0305 [PATCH] simplify ... |
887 |
void do_timer(unsigned long ticks) |
1da177e4c Linux-2.6.12-rc2 |
888 |
{ |
3171a0305 [PATCH] simplify ... |
889 890 |
jiffies_64 += ticks; update_times(ticks); |
1da177e4c Linux-2.6.12-rc2 |
891 892 893 894 895 896 897 898 899 900 |
} #ifdef __ARCH_WANT_SYS_ALARM /* * For backwards compatibility? This can be done in libc so Alpha * and all newer ports shouldn't need it. */ asmlinkage unsigned long sys_alarm(unsigned int seconds) { |
c08b8a491 [PATCH] sys_alarm... |
901 |
return alarm_setitimer(seconds); |
1da177e4c Linux-2.6.12-rc2 |
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 |
} #endif #ifndef __alpha__ /* * The Alpha uses getxpid, getxuid, and getxgid instead. Maybe this * should be moved into arch/i386 instead? */ /** * sys_getpid - return the thread group id of the current process * * Note, despite the name, this returns the tgid not the pid. The tgid and * the pid are identical unless CLONE_THREAD was specified on clone() in * which case the tgid is the same in all threads of the same group. * * This is SMP safe as current->tgid does not change. */ asmlinkage long sys_getpid(void) { return current->tgid; } /* |
6997a6faa [PATCH] sys_getpp... |
928 929 930 931 |
* Accessing ->real_parent is not SMP-safe, it could * change from under us. However, we can use a stale * value of ->real_parent under rcu_read_lock(), see * release_task()->call_rcu(delayed_put_task_struct). |
1da177e4c Linux-2.6.12-rc2 |
932 933 934 935 |
*/ asmlinkage long sys_getppid(void) { int pid; |
1da177e4c Linux-2.6.12-rc2 |
936 |
|
6997a6faa [PATCH] sys_getpp... |
937 938 939 |
rcu_read_lock(); pid = rcu_dereference(current->real_parent)->tgid; rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
940 |
|
1da177e4c Linux-2.6.12-rc2 |
941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 |
return pid; } asmlinkage long sys_getuid(void) { /* Only we change this so SMP safe */ return current->uid; } asmlinkage long sys_geteuid(void) { /* Only we change this so SMP safe */ return current->euid; } asmlinkage long sys_getgid(void) { /* Only we change this so SMP safe */ return current->gid; } asmlinkage long sys_getegid(void) { /* Only we change this so SMP safe */ return current->egid; } #endif static void process_timeout(unsigned long __data) { |
36c8b5868 [PATCH] sched: cl... |
972 |
wake_up_process((struct task_struct *)__data); |
1da177e4c Linux-2.6.12-rc2 |
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 |
} /** * schedule_timeout - sleep until timeout * @timeout: timeout value in jiffies * * Make the current task sleep until @timeout jiffies have * 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 jiffies are guaranteed to * pass before the routine returns. The routine will return 0 * * %TASK_INTERRUPTIBLE - the routine may return early if a signal is * delivered to the current task. In this case the remaining time * in jiffies will be returned, or 0 if the timer expired in time * * The current task state is guaranteed to be TASK_RUNNING when this * routine returns. * * Specifying a @timeout value of %MAX_SCHEDULE_TIMEOUT will schedule * the CPU away without a bound on the timeout. In this case the return * value will be %MAX_SCHEDULE_TIMEOUT. * * In all cases the return value is guaranteed to be non-negative. */ fastcall signed long __sched schedule_timeout(signed long timeout) { struct timer_list timer; unsigned long expire; switch (timeout) { case MAX_SCHEDULE_TIMEOUT: /* * These two special cases are useful to be comfortable * in the caller. Nothing more. We could take * MAX_SCHEDULE_TIMEOUT from one of the negative value * but I' d like to return a valid offset (>=0) to allow * the caller to do everything it want with the retval. */ schedule(); goto out; default: /* * Another bit of PARANOID. Note that the retval will be * 0 since no piece of kernel is supposed to do a check * for a negative retval of schedule_timeout() (since it * should never happens anyway). You just have the printk() * that will tell you if something is gone wrong and where. */ |
5b149bcc2 [PATCH] schedule_... |
1026 |
if (timeout < 0) { |
1da177e4c Linux-2.6.12-rc2 |
1027 |
printk(KERN_ERR "schedule_timeout: wrong timeout " |
5b149bcc2 [PATCH] schedule_... |
1028 1029 1030 |
"value %lx ", timeout); dump_stack(); |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 1034 1035 1036 |
current->state = TASK_RUNNING; goto out; } } expire = timeout + jiffies; |
a8db2db1e [PATCH] introduce... |
1037 1038 |
setup_timer(&timer, process_timeout, (unsigned long)current); __mod_timer(&timer, expire); |
1da177e4c Linux-2.6.12-rc2 |
1039 1040 1041 1042 1043 1044 1045 1046 |
schedule(); del_singleshot_timer_sync(&timer); timeout = expire - jiffies; out: return timeout < 0 ? 0 : timeout; } |
1da177e4c Linux-2.6.12-rc2 |
1047 |
EXPORT_SYMBOL(schedule_timeout); |
8a1c17574 [PATCH] schedule_... |
1048 1049 1050 1051 |
/* * We can use __set_current_state() here because schedule_timeout() calls * schedule() unconditionally. */ |
64ed93a26 [PATCH] add sched... |
1052 1053 |
signed long __sched schedule_timeout_interruptible(signed long timeout) { |
a5a0d52c7 [PATCH] ntp white... |
1054 1055 |
__set_current_state(TASK_INTERRUPTIBLE); return schedule_timeout(timeout); |
64ed93a26 [PATCH] add sched... |
1056 1057 1058 1059 1060 |
} EXPORT_SYMBOL(schedule_timeout_interruptible); signed long __sched schedule_timeout_uninterruptible(signed long timeout) { |
a5a0d52c7 [PATCH] ntp white... |
1061 1062 |
__set_current_state(TASK_UNINTERRUPTIBLE); return schedule_timeout(timeout); |
64ed93a26 [PATCH] add sched... |
1063 1064 |
} EXPORT_SYMBOL(schedule_timeout_uninterruptible); |
1da177e4c Linux-2.6.12-rc2 |
1065 1066 1067 1068 1069 |
/* Thread ID - the internal kernel "pid" */ asmlinkage long sys_gettid(void) { return current->pid; } |
2aae4a108 [PATCH] Fix kerne... |
1070 |
/** |
d4d23add3 [PATCH] Common co... |
1071 |
* do_sysinfo - fill in sysinfo struct |
2aae4a108 [PATCH] Fix kerne... |
1072 |
* @info: pointer to buffer to fill |
6819457d2 timer.c: cleanup ... |
1073 |
*/ |
d4d23add3 [PATCH] Common co... |
1074 |
int do_sysinfo(struct sysinfo *info) |
1da177e4c Linux-2.6.12-rc2 |
1075 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1076 1077 1078 |
unsigned long mem_total, sav_total; unsigned int mem_unit, bitcount; unsigned long seq; |
d4d23add3 [PATCH] Common co... |
1079 |
memset(info, 0, sizeof(struct sysinfo)); |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 |
do { struct timespec tp; seq = read_seqbegin(&xtime_lock); /* * This is annoying. The below is the same thing * posix_get_clock_monotonic() does, but it wants to * take the lock which we want to cover the loads stuff * too. */ getnstimeofday(&tp); tp.tv_sec += wall_to_monotonic.tv_sec; tp.tv_nsec += wall_to_monotonic.tv_nsec; |
d62141414 Use boot based ti... |
1095 |
monotonic_to_bootbased(&tp); |
1da177e4c Linux-2.6.12-rc2 |
1096 1097 1098 1099 |
if (tp.tv_nsec - NSEC_PER_SEC >= 0) { tp.tv_nsec = tp.tv_nsec - NSEC_PER_SEC; tp.tv_sec++; } |
d4d23add3 [PATCH] Common co... |
1100 |
info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1101 |
|
d4d23add3 [PATCH] Common co... |
1102 1103 1104 |
info->loads[0] = avenrun[0] << (SI_LOAD_SHIFT - FSHIFT); info->loads[1] = avenrun[1] << (SI_LOAD_SHIFT - FSHIFT); info->loads[2] = avenrun[2] << (SI_LOAD_SHIFT - FSHIFT); |
1da177e4c Linux-2.6.12-rc2 |
1105 |
|
d4d23add3 [PATCH] Common co... |
1106 |
info->procs = nr_threads; |
1da177e4c Linux-2.6.12-rc2 |
1107 |
} while (read_seqretry(&xtime_lock, seq)); |
d4d23add3 [PATCH] Common co... |
1108 1109 |
si_meminfo(info); si_swapinfo(info); |
1da177e4c Linux-2.6.12-rc2 |
1110 1111 1112 1113 1114 1115 1116 1117 1118 |
/* * If the sum of all the available memory (i.e. ram + swap) * is less than can be stored in a 32 bit unsigned long then * we can be binary compatible with 2.2.x kernels. If not, * well, in that case 2.2.x was broken anyways... * * -Erik Andersen <andersee@debian.org> */ |
d4d23add3 [PATCH] Common co... |
1119 1120 |
mem_total = info->totalram + info->totalswap; if (mem_total < info->totalram || mem_total < info->totalswap) |
1da177e4c Linux-2.6.12-rc2 |
1121 1122 |
goto out; bitcount = 0; |
d4d23add3 [PATCH] Common co... |
1123 |
mem_unit = info->mem_unit; |
1da177e4c Linux-2.6.12-rc2 |
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 |
while (mem_unit > 1) { bitcount++; mem_unit >>= 1; sav_total = mem_total; mem_total <<= 1; if (mem_total < sav_total) goto out; } /* * If mem_total did not overflow, multiply all memory values by |
d4d23add3 [PATCH] Common co... |
1135 |
* info->mem_unit and set it to 1. This leaves things compatible |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 1138 |
* with 2.2.x, and also retains compatibility with earlier 2.4.x * kernels... */ |
d4d23add3 [PATCH] Common co... |
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 |
info->mem_unit = 1; info->totalram <<= bitcount; info->freeram <<= bitcount; info->sharedram <<= bitcount; info->bufferram <<= bitcount; info->totalswap <<= bitcount; info->freeswap <<= bitcount; info->totalhigh <<= bitcount; info->freehigh <<= bitcount; out: return 0; } asmlinkage long sys_sysinfo(struct sysinfo __user *info) { struct sysinfo val; do_sysinfo(&val); |
1da177e4c Linux-2.6.12-rc2 |
1158 |
|
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 |
if (copy_to_user(info, &val, sizeof(struct sysinfo))) return -EFAULT; return 0; } |
d730e882a [PATCH] lockdep: ... |
1164 1165 1166 1167 1168 1169 |
/* * lockdep: we want to track each per-CPU base as a separate lock-class, * but timer-bases are kmalloc()-ed, so we need to attach separate * keys to them: */ static struct lock_class_key base_lock_keys[NR_CPUS]; |
a4a6198b8 [PATCH] tvec_base... |
1170 |
static int __devinit init_timers_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1171 1172 1173 |
{ int j; tvec_base_t *base; |
ba6edfcd1 [PATCH] timer ini... |
1174 |
static char __devinitdata tvec_base_done[NR_CPUS]; |
55c888d6d [PATCH] timers fi... |
1175 |
|
ba6edfcd1 [PATCH] timer ini... |
1176 |
if (!tvec_base_done[cpu]) { |
a4a6198b8 [PATCH] tvec_base... |
1177 |
static char boot_done; |
a4a6198b8 [PATCH] tvec_base... |
1178 |
if (boot_done) { |
ba6edfcd1 [PATCH] timer ini... |
1179 1180 1181 |
/* * The APs use this path later in boot */ |
94f6030ca Slab allocators: ... |
1182 1183 |
base = kmalloc_node(sizeof(*base), GFP_KERNEL | __GFP_ZERO, |
a4a6198b8 [PATCH] tvec_base... |
1184 1185 1186 |
cpu_to_node(cpu)); if (!base) return -ENOMEM; |
6e453a675 Add support for d... |
1187 1188 1189 1190 1191 1192 1193 |
/* Make sure that tvec_base is 2 byte aligned */ if (tbase_get_deferrable(base)) { WARN_ON(1); kfree(base); return -ENOMEM; } |
ba6edfcd1 [PATCH] timer ini... |
1194 |
per_cpu(tvec_bases, cpu) = base; |
a4a6198b8 [PATCH] tvec_base... |
1195 |
} else { |
ba6edfcd1 [PATCH] timer ini... |
1196 1197 1198 1199 1200 1201 |
/* * This is for the boot CPU - we use compile-time * static initialisation because per-cpu memory isn't * ready yet and because the memory allocators are not * initialised either. */ |
a4a6198b8 [PATCH] tvec_base... |
1202 |
boot_done = 1; |
ba6edfcd1 [PATCH] timer ini... |
1203 |
base = &boot_tvec_bases; |
a4a6198b8 [PATCH] tvec_base... |
1204 |
} |
ba6edfcd1 [PATCH] timer ini... |
1205 1206 1207 |
tvec_base_done[cpu] = 1; } else { base = per_cpu(tvec_bases, cpu); |
a4a6198b8 [PATCH] tvec_base... |
1208 |
} |
ba6edfcd1 [PATCH] timer ini... |
1209 |
|
3691c5199 [PATCH] kill __in... |
1210 |
spin_lock_init(&base->lock); |
d730e882a [PATCH] lockdep: ... |
1211 |
lockdep_set_class(&base->lock, base_lock_keys + cpu); |
1da177e4c Linux-2.6.12-rc2 |
1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 |
for (j = 0; j < TVN_SIZE; j++) { INIT_LIST_HEAD(base->tv5.vec + j); INIT_LIST_HEAD(base->tv4.vec + j); INIT_LIST_HEAD(base->tv3.vec + j); INIT_LIST_HEAD(base->tv2.vec + j); } for (j = 0; j < TVR_SIZE; j++) INIT_LIST_HEAD(base->tv1.vec + j); base->timer_jiffies = jiffies; |
a4a6198b8 [PATCH] tvec_base... |
1222 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1223 1224 1225 |
} #ifdef CONFIG_HOTPLUG_CPU |
55c888d6d [PATCH] timers fi... |
1226 |
static void migrate_timer_list(tvec_base_t *new_base, struct list_head *head) |
1da177e4c Linux-2.6.12-rc2 |
1227 1228 1229 1230 |
{ struct timer_list *timer; while (!list_empty(head)) { |
b5e618181 Introduce a handy... |
1231 |
timer = list_first_entry(head, struct timer_list, entry); |
55c888d6d [PATCH] timers fi... |
1232 |
detach_timer(timer, 0); |
6e453a675 Add support for d... |
1233 |
timer_set_base(timer, new_base); |
1da177e4c Linux-2.6.12-rc2 |
1234 |
internal_add_timer(new_base, timer); |
1da177e4c Linux-2.6.12-rc2 |
1235 |
} |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 1238 1239 1240 1241 1242 1243 1244 |
} static void __devinit migrate_timers(int cpu) { tvec_base_t *old_base; tvec_base_t *new_base; int i; BUG_ON(cpu_online(cpu)); |
a4a6198b8 [PATCH] tvec_base... |
1245 1246 |
old_base = per_cpu(tvec_bases, cpu); new_base = get_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
1247 1248 |
local_irq_disable(); |
e81ce1f7e [PATCH] timer/hrt... |
1249 1250 |
double_spin_lock(&new_base->lock, &old_base->lock, smp_processor_id() < cpu); |
3691c5199 [PATCH] kill __in... |
1251 1252 |
BUG_ON(old_base->running_timer); |
1da177e4c Linux-2.6.12-rc2 |
1253 |
|
1da177e4c Linux-2.6.12-rc2 |
1254 |
for (i = 0; i < TVR_SIZE; i++) |
55c888d6d [PATCH] timers fi... |
1255 1256 1257 1258 1259 1260 1261 |
migrate_timer_list(new_base, old_base->tv1.vec + i); for (i = 0; i < TVN_SIZE; i++) { migrate_timer_list(new_base, old_base->tv2.vec + i); migrate_timer_list(new_base, old_base->tv3.vec + i); migrate_timer_list(new_base, old_base->tv4.vec + i); migrate_timer_list(new_base, old_base->tv5.vec + i); } |
e81ce1f7e [PATCH] timer/hrt... |
1262 1263 |
double_spin_unlock(&new_base->lock, &old_base->lock, smp_processor_id() < cpu); |
1da177e4c Linux-2.6.12-rc2 |
1264 1265 |
local_irq_enable(); put_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
1266 1267 |
} #endif /* CONFIG_HOTPLUG_CPU */ |
8c78f3075 [PATCH] cpu hotpl... |
1268 |
static int __cpuinit timer_cpu_notify(struct notifier_block *self, |
1da177e4c Linux-2.6.12-rc2 |
1269 1270 1271 1272 1273 |
unsigned long action, void *hcpu) { long cpu = (long)hcpu; switch(action) { case CPU_UP_PREPARE: |
8bb784428 Add suspend-relat... |
1274 |
case CPU_UP_PREPARE_FROZEN: |
a4a6198b8 [PATCH] tvec_base... |
1275 1276 |
if (init_timers_cpu(cpu) < 0) return NOTIFY_BAD; |
1da177e4c Linux-2.6.12-rc2 |
1277 1278 1279 |
break; #ifdef CONFIG_HOTPLUG_CPU case CPU_DEAD: |
8bb784428 Add suspend-relat... |
1280 |
case CPU_DEAD_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
1281 1282 1283 1284 1285 1286 1287 1288 |
migrate_timers(cpu); break; #endif default: break; } return NOTIFY_OK; } |
8c78f3075 [PATCH] cpu hotpl... |
1289 |
static struct notifier_block __cpuinitdata timers_nb = { |
1da177e4c Linux-2.6.12-rc2 |
1290 1291 1292 1293 1294 1295 |
.notifier_call = timer_cpu_notify, }; void __init init_timers(void) { |
07dccf334 [PATCH] check ret... |
1296 |
int err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE, |
1da177e4c Linux-2.6.12-rc2 |
1297 |
(void *)(long)smp_processor_id()); |
07dccf334 [PATCH] check ret... |
1298 |
|
82f67cd9f [PATCH] Add debug... |
1299 |
init_timer_stats(); |
07dccf334 [PATCH] check ret... |
1300 |
BUG_ON(err == NOTIFY_BAD); |
1da177e4c Linux-2.6.12-rc2 |
1301 1302 1303 1304 1305 |
register_cpu_notifier(&timers_nb); open_softirq(TIMER_SOFTIRQ, run_timer_softirq, NULL); } #ifdef CONFIG_TIME_INTERPOLATION |
67890d708 [PATCH] time_inte... |
1306 1307 |
struct time_interpolator *time_interpolator __read_mostly; static struct time_interpolator *time_interpolator_list __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
1308 |
static DEFINE_SPINLOCK(time_interpolator_lock); |
3db5db4fc [PATCH] use cycle... |
1309 |
static inline cycles_t time_interpolator_get_cycles(unsigned int src) |
1da177e4c Linux-2.6.12-rc2 |
1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 |
{ unsigned long (*x)(void); switch (src) { case TIME_SOURCE_FUNCTION: x = time_interpolator->addr; return x(); case TIME_SOURCE_MMIO64 : |
685db65e4 [PATCH] time_inte... |
1320 |
return readq_relaxed((void __iomem *)time_interpolator->addr); |
1da177e4c Linux-2.6.12-rc2 |
1321 1322 |
case TIME_SOURCE_MMIO32 : |
685db65e4 [PATCH] time_inte... |
1323 |
return readl_relaxed((void __iomem *)time_interpolator->addr); |
1da177e4c Linux-2.6.12-rc2 |
1324 1325 1326 1327 |
default: return get_cycles(); } } |
486d46aef [PATCH] optimize ... |
1328 |
static inline u64 time_interpolator_get_counter(int writelock) |
1da177e4c Linux-2.6.12-rc2 |
1329 1330 1331 1332 1333 |
{ unsigned int src = time_interpolator->source; if (time_interpolator->jitter) { |
3db5db4fc [PATCH] use cycle... |
1334 1335 |
cycles_t lcycle; cycles_t now; |
1da177e4c Linux-2.6.12-rc2 |
1336 1337 1338 1339 1340 1341 |
do { lcycle = time_interpolator->last_cycle; now = time_interpolator_get_cycles(src); if (lcycle && time_after(lcycle, now)) return lcycle; |
486d46aef [PATCH] optimize ... |
1342 1343 1344 1345 1346 1347 1348 1349 1350 |
/* When holding the xtime write lock, there's no need * to add the overhead of the cmpxchg. Readers are * force to retry until the write lock is released. */ if (writelock) { time_interpolator->last_cycle = now; return now; } |
1da177e4c Linux-2.6.12-rc2 |
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 |
/* Keep track of the last timer value returned. The use of cmpxchg here * will cause contention in an SMP environment. */ } while (unlikely(cmpxchg(&time_interpolator->last_cycle, lcycle, now) != lcycle)); return now; } else return time_interpolator_get_cycles(src); } void time_interpolator_reset(void) { time_interpolator->offset = 0; |
486d46aef [PATCH] optimize ... |
1364 |
time_interpolator->last_counter = time_interpolator_get_counter(1); |
1da177e4c Linux-2.6.12-rc2 |
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 |
} #define GET_TI_NSECS(count,i) (((((count) - i->last_counter) & (i)->mask) * (i)->nsec_per_cyc) >> (i)->shift) unsigned long time_interpolator_get_offset(void) { /* If we do not have a time interpolator set up then just return zero */ if (!time_interpolator) return 0; return time_interpolator->offset + |
486d46aef [PATCH] optimize ... |
1376 |
GET_TI_NSECS(time_interpolator_get_counter(0), time_interpolator); |
1da177e4c Linux-2.6.12-rc2 |
1377 1378 1379 1380 |
} #define INTERPOLATOR_ADJUST 65536 #define INTERPOLATOR_MAX_SKIP 10*INTERPOLATOR_ADJUST |
4c7ee8de9 [PATCH] NTP: Move... |
1381 |
void time_interpolator_update(long delta_nsec) |
1da177e4c Linux-2.6.12-rc2 |
1382 1383 1384 1385 1386 1387 1388 |
{ u64 counter; unsigned long offset; /* If there is no time interpolator set up then do nothing */ if (!time_interpolator) return; |
a5a0d52c7 [PATCH] ntp white... |
1389 1390 1391 1392 1393 1394 1395 1396 |
/* * The interpolator compensates for late ticks by accumulating the late * time in time_interpolator->offset. A tick earlier than expected will * lead to a reset of the offset and a corresponding jump of the clock * forward. Again this only works if the interpolator clock is running * slightly slower than the regular clock and the tuning logic insures * that. */ |
1da177e4c Linux-2.6.12-rc2 |
1397 |
|
486d46aef [PATCH] optimize ... |
1398 |
counter = time_interpolator_get_counter(1); |
a5a0d52c7 [PATCH] ntp white... |
1399 1400 |
offset = time_interpolator->offset + GET_TI_NSECS(counter, time_interpolator); |
1da177e4c Linux-2.6.12-rc2 |
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 |
if (delta_nsec < 0 || (unsigned long) delta_nsec < offset) time_interpolator->offset = offset - delta_nsec; else { time_interpolator->skips++; time_interpolator->ns_skipped += delta_nsec - offset; time_interpolator->offset = 0; } time_interpolator->last_counter = counter; /* Tuning logic for time interpolator invoked every minute or so. * Decrease interpolator clock speed if no skips occurred and an offset is carried. * Increase interpolator clock speed if we skip too much time. */ if (jiffies % INTERPOLATOR_ADJUST == 0) { |
b20367a6c [PATCH] x86_64: F... |
1417 |
if (time_interpolator->skips == 0 && time_interpolator->offset > tick_nsec) |
1da177e4c Linux-2.6.12-rc2 |
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
time_interpolator->nsec_per_cyc--; if (time_interpolator->ns_skipped > INTERPOLATOR_MAX_SKIP && time_interpolator->offset == 0) time_interpolator->nsec_per_cyc++; time_interpolator->skips = 0; time_interpolator->ns_skipped = 0; } } static inline int is_better_time_interpolator(struct time_interpolator *new) { if (!time_interpolator) return 1; return new->frequency > 2*time_interpolator->frequency || (unsigned long)new->drift < (unsigned long)time_interpolator->drift; } void register_time_interpolator(struct time_interpolator *ti) { unsigned long flags; /* Sanity check */ |
9f31252cb BUG_ON() Conversi... |
1441 |
BUG_ON(ti->frequency == 0 || ti->mask == 0); |
1da177e4c Linux-2.6.12-rc2 |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 |
ti->nsec_per_cyc = ((u64)NSEC_PER_SEC << ti->shift) / ti->frequency; spin_lock(&time_interpolator_lock); write_seqlock_irqsave(&xtime_lock, flags); if (is_better_time_interpolator(ti)) { time_interpolator = ti; time_interpolator_reset(); } write_sequnlock_irqrestore(&xtime_lock, flags); ti->next = time_interpolator_list; time_interpolator_list = ti; spin_unlock(&time_interpolator_lock); } void unregister_time_interpolator(struct time_interpolator *ti) { struct time_interpolator *curr, **prev; unsigned long flags; spin_lock(&time_interpolator_lock); prev = &time_interpolator_list; for (curr = *prev; curr; curr = curr->next) { if (curr == ti) { *prev = curr->next; break; } prev = &curr->next; } write_seqlock_irqsave(&xtime_lock, flags); if (ti == time_interpolator) { /* we lost the best time-interpolator: */ time_interpolator = NULL; /* find the next-best interpolator */ for (curr = time_interpolator_list; curr; curr = curr->next) if (is_better_time_interpolator(curr)) time_interpolator = curr; time_interpolator_reset(); } write_sequnlock_irqrestore(&xtime_lock, flags); spin_unlock(&time_interpolator_lock); } #endif /* CONFIG_TIME_INTERPOLATION */ /** * msleep - sleep safely even with waitqueue interruptions * @msecs: Time in milliseconds to sleep for */ void msleep(unsigned int msecs) { unsigned long timeout = msecs_to_jiffies(msecs) + 1; |
75bcc8c5e [PATCH] kernel: f... |
1495 1496 |
while (timeout) timeout = schedule_timeout_uninterruptible(timeout); |
1da177e4c Linux-2.6.12-rc2 |
1497 1498 1499 1500 1501 |
} EXPORT_SYMBOL(msleep); /** |
96ec3efdc [PATCH] kernel/ti... |
1502 |
* msleep_interruptible - sleep waiting for signals |
1da177e4c Linux-2.6.12-rc2 |
1503 1504 1505 1506 1507 |
* @msecs: Time in milliseconds to sleep for */ unsigned long msleep_interruptible(unsigned int msecs) { unsigned long timeout = msecs_to_jiffies(msecs) + 1; |
75bcc8c5e [PATCH] kernel: f... |
1508 1509 |
while (timeout && !signal_pending(current)) timeout = schedule_timeout_interruptible(timeout); |
1da177e4c Linux-2.6.12-rc2 |
1510 1511 1512 1513 |
return jiffies_to_msecs(timeout); } EXPORT_SYMBOL(msleep_interruptible); |