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kernel/timer.c
36 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> |
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#include <linux/pid_namespace.h> |
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#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... |
523 |
tvec_base_t *base; |
fd450b731 [PATCH] timers: i... |
524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 |
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 ... |
542 |
EXPORT_SYMBOL(try_to_del_timer_sync); |
2aae4a108 [PATCH] Fix kerne... |
543 |
/** |
1da177e4c Linux-2.6.12-rc2 |
544 545 546 547 548 549 550 |
* 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 ... |
551 |
* Synchronization rules: Callers must prevent restarting of the timer, |
1da177e4c Linux-2.6.12-rc2 |
552 553 |
* 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... |
554 555 556 |
* 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 |
557 558 |
* * The function returns whether it has deactivated a pending timer or not. |
1da177e4c Linux-2.6.12-rc2 |
559 560 561 |
*/ int del_timer_sync(struct timer_list *timer) { |
fd450b731 [PATCH] timers: i... |
562 563 564 565 |
for (;;) { int ret = try_to_del_timer_sync(timer); if (ret >= 0) return ret; |
a0009652a [PATCH] del_timer... |
566 |
cpu_relax(); |
fd450b731 [PATCH] timers: i... |
567 |
} |
1da177e4c Linux-2.6.12-rc2 |
568 |
} |
1da177e4c Linux-2.6.12-rc2 |
569 |
|
55c888d6d [PATCH] timers fi... |
570 |
EXPORT_SYMBOL(del_timer_sync); |
1da177e4c Linux-2.6.12-rc2 |
571 572 573 574 575 |
#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... |
576 577 578 579 |
struct timer_list *timer, *tmp; struct list_head tv_list; list_replace_init(tv->vec + index, &tv_list); |
1da177e4c Linux-2.6.12-rc2 |
580 |
|
1da177e4c Linux-2.6.12-rc2 |
581 |
/* |
3439dd86e [PATCH] When CONF... |
582 583 |
* We are removing _all_ timers from the list, so we * don't have to detach them individually. |
1da177e4c Linux-2.6.12-rc2 |
584 |
*/ |
3439dd86e [PATCH] When CONF... |
585 |
list_for_each_entry_safe(timer, tmp, &tv_list, entry) { |
6e453a675 Add support for d... |
586 |
BUG_ON(tbase_get_base(timer->base) != base); |
3439dd86e [PATCH] When CONF... |
587 |
internal_add_timer(base, timer); |
1da177e4c Linux-2.6.12-rc2 |
588 |
} |
1da177e4c Linux-2.6.12-rc2 |
589 590 591 |
return index; } |
2aae4a108 [PATCH] Fix kerne... |
592 593 594 |
#define INDEX(N) ((base->timer_jiffies >> (TVR_BITS + (N) * TVN_BITS)) & TVN_MASK) /** |
1da177e4c Linux-2.6.12-rc2 |
595 596 597 598 599 600 |
* __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 |
601 602 603 |
static inline void __run_timers(tvec_base_t *base) { struct timer_list *timer; |
3691c5199 [PATCH] kill __in... |
604 |
spin_lock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
605 |
while (time_after_eq(jiffies, base->timer_jiffies)) { |
626ab0e69 [PATCH] list: use... |
606 |
struct list_head work_list; |
1da177e4c Linux-2.6.12-rc2 |
607 |
struct list_head *head = &work_list; |
6819457d2 timer.c: cleanup ... |
608 |
int index = base->timer_jiffies & TVR_MASK; |
626ab0e69 [PATCH] list: use... |
609 |
|
1da177e4c Linux-2.6.12-rc2 |
610 611 612 613 614 615 616 617 |
/* * 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... |
618 619 |
++base->timer_jiffies; list_replace_init(base->tv1.vec + index, &work_list); |
55c888d6d [PATCH] timers fi... |
620 |
while (!list_empty(head)) { |
1da177e4c Linux-2.6.12-rc2 |
621 622 |
void (*fn)(unsigned long); unsigned long data; |
b5e618181 Introduce a handy... |
623 |
timer = list_first_entry(head, struct timer_list,entry); |
6819457d2 timer.c: cleanup ... |
624 625 |
fn = timer->function; data = timer->data; |
1da177e4c Linux-2.6.12-rc2 |
626 |
|
82f67cd9f [PATCH] Add debug... |
627 |
timer_stats_account_timer(timer); |
1da177e4c Linux-2.6.12-rc2 |
628 |
set_running_timer(base, timer); |
55c888d6d [PATCH] timers fi... |
629 |
detach_timer(timer, 1); |
3691c5199 [PATCH] kill __in... |
630 |
spin_unlock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
631 |
{ |
be5b4fbd0 [PATCH] preempt_c... |
632 |
int preempt_count = preempt_count(); |
1da177e4c Linux-2.6.12-rc2 |
633 634 |
fn(data); if (preempt_count != preempt_count()) { |
be5b4fbd0 [PATCH] preempt_c... |
635 636 637 638 639 640 |
printk(KERN_WARNING "huh, entered %p " "with preempt_count %08x, exited" " with %08x? ", fn, preempt_count, preempt_count()); |
1da177e4c Linux-2.6.12-rc2 |
641 642 643 |
BUG(); } } |
3691c5199 [PATCH] kill __in... |
644 |
spin_lock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
645 646 647 |
} } set_running_timer(base, NULL); |
3691c5199 [PATCH] kill __in... |
648 |
spin_unlock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
649 |
} |
fd064b9b7 [PATCH] Extend ne... |
650 |
#if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_NO_HZ) |
1da177e4c Linux-2.6.12-rc2 |
651 652 653 654 655 |
/* * 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... |
656 |
static unsigned long __next_timer_interrupt(tvec_base_t *base) |
1da177e4c Linux-2.6.12-rc2 |
657 |
{ |
1cfd68496 [PATCH] Fix casca... |
658 |
unsigned long timer_jiffies = base->timer_jiffies; |
eaad084bb NOHZ: prevent mul... |
659 |
unsigned long expires = timer_jiffies + NEXT_TIMER_MAX_DELTA; |
1cfd68496 [PATCH] Fix casca... |
660 |
int index, slot, array, found = 0; |
1da177e4c Linux-2.6.12-rc2 |
661 |
struct timer_list *nte; |
1da177e4c Linux-2.6.12-rc2 |
662 |
tvec_t *varray[4]; |
1da177e4c Linux-2.6.12-rc2 |
663 664 |
/* Look for timer events in tv1. */ |
1cfd68496 [PATCH] Fix casca... |
665 |
index = slot = timer_jiffies & TVR_MASK; |
1da177e4c Linux-2.6.12-rc2 |
666 |
do { |
1cfd68496 [PATCH] Fix casca... |
667 |
list_for_each_entry(nte, base->tv1.vec + slot, entry) { |
6819457d2 timer.c: cleanup ... |
668 669 |
if (tbase_get_deferrable(nte->base)) continue; |
6e453a675 Add support for d... |
670 |
|
1cfd68496 [PATCH] Fix casca... |
671 |
found = 1; |
1da177e4c Linux-2.6.12-rc2 |
672 |
expires = nte->expires; |
1cfd68496 [PATCH] Fix casca... |
673 674 675 676 |
/* Look at the cascade bucket(s)? */ if (!index || slot < index) goto cascade; return expires; |
1da177e4c Linux-2.6.12-rc2 |
677 |
} |
1cfd68496 [PATCH] Fix casca... |
678 679 680 681 682 683 684 685 |
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 |
686 687 688 689 690 691 |
/* Check tv2-tv5. */ varray[0] = &base->tv2; varray[1] = &base->tv3; varray[2] = &base->tv4; varray[3] = &base->tv5; |
1cfd68496 [PATCH] Fix casca... |
692 693 694 695 696 |
for (array = 0; array < 4; array++) { tvec_t *varp = varray[array]; index = slot = timer_jiffies & TVN_MASK; |
1da177e4c Linux-2.6.12-rc2 |
697 |
do { |
1cfd68496 [PATCH] Fix casca... |
698 699 |
list_for_each_entry(nte, varp->vec + slot, entry) { found = 1; |
1da177e4c Linux-2.6.12-rc2 |
700 701 |
if (time_before(nte->expires, expires)) expires = nte->expires; |
1cfd68496 [PATCH] Fix casca... |
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
} /* * 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 |
719 |
} |
1cfd68496 [PATCH] Fix casca... |
720 721 |
return expires; } |
69239749e [PATCH] fix next_... |
722 |
|
1cfd68496 [PATCH] Fix casca... |
723 724 725 726 727 728 729 730 731 |
/* * 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:... |
732 |
unsigned long delta; |
1cfd68496 [PATCH] Fix casca... |
733 734 735 |
if (hr_delta.tv64 == KTIME_MAX) return expires; |
0662b7132 [PATCH] Fix a NO_... |
736 |
|
9501b6cf5 [PATCH] dynticks:... |
737 738 739 740 741 |
/* * Expired timer available, let it expire in the next tick */ if (hr_delta.tv64 <= 0) return now + 1; |
69239749e [PATCH] fix next_... |
742 |
|
1cfd68496 [PATCH] Fix casca... |
743 |
tsdelta = ktime_to_timespec(hr_delta); |
9501b6cf5 [PATCH] dynticks:... |
744 |
delta = timespec_to_jiffies(&tsdelta); |
eaad084bb NOHZ: prevent mul... |
745 746 747 748 749 750 751 |
/* * 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:... |
752 753 754 755 756 757 758 759 760 |
/* * 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... |
761 762 |
if (time_before(now, expires)) return now; |
1da177e4c Linux-2.6.12-rc2 |
763 764 |
return expires; } |
1cfd68496 [PATCH] Fix casca... |
765 766 |
/** |
8dce39c23 time: fix inconsi... |
767 |
* get_next_timer_interrupt - return the jiffy of the next pending timer |
05fb6bf0b [PATCH] kernel-do... |
768 |
* @now: current time (in jiffies) |
1cfd68496 [PATCH] Fix casca... |
769 |
*/ |
fd064b9b7 [PATCH] Extend ne... |
770 |
unsigned long get_next_timer_interrupt(unsigned long now) |
1cfd68496 [PATCH] Fix casca... |
771 772 |
{ tvec_base_t *base = __get_cpu_var(tvec_bases); |
fd064b9b7 [PATCH] Extend ne... |
773 |
unsigned long expires; |
1cfd68496 [PATCH] Fix casca... |
774 775 776 777 778 779 780 781 782 783 |
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... |
784 785 786 787 788 789 790 |
#ifdef CONFIG_NO_IDLE_HZ unsigned long next_timer_interrupt(void) { return get_next_timer_interrupt(jiffies); } #endif |
1da177e4c Linux-2.6.12-rc2 |
791 |
#endif |
fa13a5a1f sched: restore de... |
792 793 794 795 796 797 798 799 800 801 802 803 |
#ifndef CONFIG_VIRT_CPU_ACCOUNTING void account_process_tick(struct task_struct *p, int user_tick) { if (user_tick) { account_user_time(p, jiffies_to_cputime(1)); account_user_time_scaled(p, jiffies_to_cputime(1)); } else { account_system_time(p, HARDIRQ_OFFSET, jiffies_to_cputime(1)); account_system_time_scaled(p, jiffies_to_cputime(1)); } } #endif |
1da177e4c Linux-2.6.12-rc2 |
804 |
/* |
5b4db0c2f whitespace fixes:... |
805 |
* Called from the timer interrupt handler to charge one tick to the current |
1da177e4c Linux-2.6.12-rc2 |
806 807 808 809 810 811 812 813 |
* 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. */ |
fa13a5a1f sched: restore de... |
814 |
account_process_tick(p, user_tick); |
1da177e4c Linux-2.6.12-rc2 |
815 816 817 818 |
run_local_timers(); if (rcu_pending(cpu)) rcu_check_callbacks(cpu, user_tick); scheduler_tick(); |
6819457d2 timer.c: cleanup ... |
819 |
run_posix_cpu_timers(p); |
1da177e4c Linux-2.6.12-rc2 |
820 821 822 823 824 825 826 |
} /* * Nr of active tasks - counted in fixed-point numbers */ static unsigned long count_active_tasks(void) { |
db1b1fefc [PATCH] sched: re... |
827 |
return nr_active() * FIXED_1; |
1da177e4c Linux-2.6.12-rc2 |
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 |
} /* * 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 ... |
850 851 852 853 854 855 856 857 858 |
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 |
859 860 |
} } |
1da177e4c Linux-2.6.12-rc2 |
861 |
/* |
1da177e4c Linux-2.6.12-rc2 |
862 863 864 865 |
* 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... |
866 |
tvec_base_t *base = __get_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
867 |
|
82f67cd9f [PATCH] Add debug... |
868 |
hrtimer_run_queues(); |
1da177e4c Linux-2.6.12-rc2 |
869 870 871 872 873 874 875 876 877 878 |
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... |
879 |
softlockup_tick(); |
1da177e4c Linux-2.6.12-rc2 |
880 881 882 883 884 885 |
} /* * Called by the timer interrupt. xtime_lock must already be taken * by the timer IRQ! */ |
3171a0305 [PATCH] simplify ... |
886 |
static inline void update_times(unsigned long ticks) |
1da177e4c Linux-2.6.12-rc2 |
887 |
{ |
ad596171e [PATCH] Time: Use... |
888 |
update_wall_time(); |
1da177e4c Linux-2.6.12-rc2 |
889 890 |
calc_load(ticks); } |
6819457d2 timer.c: cleanup ... |
891 |
|
1da177e4c Linux-2.6.12-rc2 |
892 893 894 895 896 |
/* * 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 ... |
897 |
void do_timer(unsigned long ticks) |
1da177e4c Linux-2.6.12-rc2 |
898 |
{ |
3171a0305 [PATCH] simplify ... |
899 900 |
jiffies_64 += ticks; update_times(ticks); |
1da177e4c Linux-2.6.12-rc2 |
901 902 903 904 905 906 907 908 909 910 |
} #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... |
911 |
return alarm_setitimer(seconds); |
1da177e4c Linux-2.6.12-rc2 |
912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 |
} #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) { |
b488893a3 pid namespaces: c... |
934 |
return task_tgid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
935 936 937 |
} /* |
6997a6faa [PATCH] sys_getpp... |
938 939 940 941 |
* 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 |
942 943 944 945 |
*/ asmlinkage long sys_getppid(void) { int pid; |
1da177e4c Linux-2.6.12-rc2 |
946 |
|
6997a6faa [PATCH] sys_getpp... |
947 |
rcu_read_lock(); |
b488893a3 pid namespaces: c... |
948 |
pid = task_ppid_nr_ns(current, current->nsproxy->pid_ns); |
6997a6faa [PATCH] sys_getpp... |
949 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
950 |
|
1da177e4c Linux-2.6.12-rc2 |
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 |
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... |
982 |
wake_up_process((struct task_struct *)__data); |
1da177e4c Linux-2.6.12-rc2 |
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 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 |
} /** * 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_... |
1036 |
if (timeout < 0) { |
1da177e4c Linux-2.6.12-rc2 |
1037 |
printk(KERN_ERR "schedule_timeout: wrong timeout " |
5b149bcc2 [PATCH] schedule_... |
1038 1039 1040 |
"value %lx ", timeout); dump_stack(); |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 1044 1045 1046 |
current->state = TASK_RUNNING; goto out; } } expire = timeout + jiffies; |
a8db2db1e [PATCH] introduce... |
1047 1048 |
setup_timer(&timer, process_timeout, (unsigned long)current); __mod_timer(&timer, expire); |
1da177e4c Linux-2.6.12-rc2 |
1049 1050 1051 1052 1053 1054 1055 1056 |
schedule(); del_singleshot_timer_sync(&timer); timeout = expire - jiffies; out: return timeout < 0 ? 0 : timeout; } |
1da177e4c Linux-2.6.12-rc2 |
1057 |
EXPORT_SYMBOL(schedule_timeout); |
8a1c17574 [PATCH] schedule_... |
1058 1059 1060 1061 |
/* * We can use __set_current_state() here because schedule_timeout() calls * schedule() unconditionally. */ |
64ed93a26 [PATCH] add sched... |
1062 1063 |
signed long __sched schedule_timeout_interruptible(signed long timeout) { |
a5a0d52c7 [PATCH] ntp white... |
1064 1065 |
__set_current_state(TASK_INTERRUPTIBLE); return schedule_timeout(timeout); |
64ed93a26 [PATCH] add sched... |
1066 1067 1068 1069 1070 |
} EXPORT_SYMBOL(schedule_timeout_interruptible); signed long __sched schedule_timeout_uninterruptible(signed long timeout) { |
a5a0d52c7 [PATCH] ntp white... |
1071 1072 |
__set_current_state(TASK_UNINTERRUPTIBLE); return schedule_timeout(timeout); |
64ed93a26 [PATCH] add sched... |
1073 1074 |
} EXPORT_SYMBOL(schedule_timeout_uninterruptible); |
1da177e4c Linux-2.6.12-rc2 |
1075 1076 1077 |
/* Thread ID - the internal kernel "pid" */ asmlinkage long sys_gettid(void) { |
b488893a3 pid namespaces: c... |
1078 |
return task_pid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
1079 |
} |
2aae4a108 [PATCH] Fix kerne... |
1080 |
/** |
d4d23add3 [PATCH] Common co... |
1081 |
* do_sysinfo - fill in sysinfo struct |
2aae4a108 [PATCH] Fix kerne... |
1082 |
* @info: pointer to buffer to fill |
6819457d2 timer.c: cleanup ... |
1083 |
*/ |
d4d23add3 [PATCH] Common co... |
1084 |
int do_sysinfo(struct sysinfo *info) |
1da177e4c Linux-2.6.12-rc2 |
1085 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1086 1087 1088 |
unsigned long mem_total, sav_total; unsigned int mem_unit, bitcount; unsigned long seq; |
d4d23add3 [PATCH] Common co... |
1089 |
memset(info, 0, sizeof(struct sysinfo)); |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 |
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... |
1105 |
monotonic_to_bootbased(&tp); |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 1108 1109 |
if (tp.tv_nsec - NSEC_PER_SEC >= 0) { tp.tv_nsec = tp.tv_nsec - NSEC_PER_SEC; tp.tv_sec++; } |
d4d23add3 [PATCH] Common co... |
1110 |
info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1111 |
|
d4d23add3 [PATCH] Common co... |
1112 1113 1114 |
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 |
1115 |
|
d4d23add3 [PATCH] Common co... |
1116 |
info->procs = nr_threads; |
1da177e4c Linux-2.6.12-rc2 |
1117 |
} while (read_seqretry(&xtime_lock, seq)); |
d4d23add3 [PATCH] Common co... |
1118 1119 |
si_meminfo(info); si_swapinfo(info); |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 1122 1123 1124 1125 1126 1127 1128 |
/* * 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... |
1129 1130 |
mem_total = info->totalram + info->totalswap; if (mem_total < info->totalram || mem_total < info->totalswap) |
1da177e4c Linux-2.6.12-rc2 |
1131 1132 |
goto out; bitcount = 0; |
d4d23add3 [PATCH] Common co... |
1133 |
mem_unit = info->mem_unit; |
1da177e4c Linux-2.6.12-rc2 |
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 |
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... |
1145 |
* info->mem_unit and set it to 1. This leaves things compatible |
1da177e4c Linux-2.6.12-rc2 |
1146 1147 1148 |
* with 2.2.x, and also retains compatibility with earlier 2.4.x * kernels... */ |
d4d23add3 [PATCH] Common co... |
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 |
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 |
1168 |
|
1da177e4c Linux-2.6.12-rc2 |
1169 1170 1171 1172 1173 |
if (copy_to_user(info, &val, sizeof(struct sysinfo))) return -EFAULT; return 0; } |
d730e882a [PATCH] lockdep: ... |
1174 1175 1176 1177 1178 1179 |
/* * 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... |
1180 |
static int __devinit init_timers_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1181 1182 1183 |
{ int j; tvec_base_t *base; |
ba6edfcd1 [PATCH] timer ini... |
1184 |
static char __devinitdata tvec_base_done[NR_CPUS]; |
55c888d6d [PATCH] timers fi... |
1185 |
|
ba6edfcd1 [PATCH] timer ini... |
1186 |
if (!tvec_base_done[cpu]) { |
a4a6198b8 [PATCH] tvec_base... |
1187 |
static char boot_done; |
a4a6198b8 [PATCH] tvec_base... |
1188 |
if (boot_done) { |
ba6edfcd1 [PATCH] timer ini... |
1189 1190 1191 |
/* * The APs use this path later in boot */ |
94f6030ca Slab allocators: ... |
1192 1193 |
base = kmalloc_node(sizeof(*base), GFP_KERNEL | __GFP_ZERO, |
a4a6198b8 [PATCH] tvec_base... |
1194 1195 1196 |
cpu_to_node(cpu)); if (!base) return -ENOMEM; |
6e453a675 Add support for d... |
1197 1198 1199 1200 1201 1202 1203 |
/* 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... |
1204 |
per_cpu(tvec_bases, cpu) = base; |
a4a6198b8 [PATCH] tvec_base... |
1205 |
} else { |
ba6edfcd1 [PATCH] timer ini... |
1206 1207 1208 1209 1210 1211 |
/* * 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... |
1212 |
boot_done = 1; |
ba6edfcd1 [PATCH] timer ini... |
1213 |
base = &boot_tvec_bases; |
a4a6198b8 [PATCH] tvec_base... |
1214 |
} |
ba6edfcd1 [PATCH] timer ini... |
1215 1216 1217 |
tvec_base_done[cpu] = 1; } else { base = per_cpu(tvec_bases, cpu); |
a4a6198b8 [PATCH] tvec_base... |
1218 |
} |
ba6edfcd1 [PATCH] timer ini... |
1219 |
|
3691c5199 [PATCH] kill __in... |
1220 |
spin_lock_init(&base->lock); |
d730e882a [PATCH] lockdep: ... |
1221 |
lockdep_set_class(&base->lock, base_lock_keys + cpu); |
1da177e4c Linux-2.6.12-rc2 |
1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 |
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... |
1232 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1233 1234 1235 |
} #ifdef CONFIG_HOTPLUG_CPU |
55c888d6d [PATCH] timers fi... |
1236 |
static void migrate_timer_list(tvec_base_t *new_base, struct list_head *head) |
1da177e4c Linux-2.6.12-rc2 |
1237 1238 1239 1240 |
{ struct timer_list *timer; while (!list_empty(head)) { |
b5e618181 Introduce a handy... |
1241 |
timer = list_first_entry(head, struct timer_list, entry); |
55c888d6d [PATCH] timers fi... |
1242 |
detach_timer(timer, 0); |
6e453a675 Add support for d... |
1243 |
timer_set_base(timer, new_base); |
1da177e4c Linux-2.6.12-rc2 |
1244 |
internal_add_timer(new_base, timer); |
1da177e4c Linux-2.6.12-rc2 |
1245 |
} |
1da177e4c Linux-2.6.12-rc2 |
1246 1247 1248 1249 1250 1251 1252 1253 1254 |
} 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... |
1255 1256 |
old_base = per_cpu(tvec_bases, cpu); new_base = get_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
1257 1258 |
local_irq_disable(); |
e81ce1f7e [PATCH] timer/hrt... |
1259 1260 |
double_spin_lock(&new_base->lock, &old_base->lock, smp_processor_id() < cpu); |
3691c5199 [PATCH] kill __in... |
1261 1262 |
BUG_ON(old_base->running_timer); |
1da177e4c Linux-2.6.12-rc2 |
1263 |
|
1da177e4c Linux-2.6.12-rc2 |
1264 |
for (i = 0; i < TVR_SIZE; i++) |
55c888d6d [PATCH] timers fi... |
1265 1266 1267 1268 1269 1270 1271 |
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... |
1272 1273 |
double_spin_unlock(&new_base->lock, &old_base->lock, smp_processor_id() < cpu); |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 |
local_irq_enable(); put_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
1276 1277 |
} #endif /* CONFIG_HOTPLUG_CPU */ |
8c78f3075 [PATCH] cpu hotpl... |
1278 |
static int __cpuinit timer_cpu_notify(struct notifier_block *self, |
1da177e4c Linux-2.6.12-rc2 |
1279 1280 1281 1282 1283 |
unsigned long action, void *hcpu) { long cpu = (long)hcpu; switch(action) { case CPU_UP_PREPARE: |
8bb784428 Add suspend-relat... |
1284 |
case CPU_UP_PREPARE_FROZEN: |
a4a6198b8 [PATCH] tvec_base... |
1285 1286 |
if (init_timers_cpu(cpu) < 0) return NOTIFY_BAD; |
1da177e4c Linux-2.6.12-rc2 |
1287 1288 1289 |
break; #ifdef CONFIG_HOTPLUG_CPU case CPU_DEAD: |
8bb784428 Add suspend-relat... |
1290 |
case CPU_DEAD_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
1291 1292 1293 1294 1295 1296 1297 1298 |
migrate_timers(cpu); break; #endif default: break; } return NOTIFY_OK; } |
8c78f3075 [PATCH] cpu hotpl... |
1299 |
static struct notifier_block __cpuinitdata timers_nb = { |
1da177e4c Linux-2.6.12-rc2 |
1300 1301 1302 1303 1304 1305 |
.notifier_call = timer_cpu_notify, }; void __init init_timers(void) { |
07dccf334 [PATCH] check ret... |
1306 |
int err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE, |
1da177e4c Linux-2.6.12-rc2 |
1307 |
(void *)(long)smp_processor_id()); |
07dccf334 [PATCH] check ret... |
1308 |
|
82f67cd9f [PATCH] Add debug... |
1309 |
init_timer_stats(); |
07dccf334 [PATCH] check ret... |
1310 |
BUG_ON(err == NOTIFY_BAD); |
1da177e4c Linux-2.6.12-rc2 |
1311 1312 1313 |
register_cpu_notifier(&timers_nb); open_softirq(TIMER_SOFTIRQ, run_timer_softirq, NULL); } |
1da177e4c Linux-2.6.12-rc2 |
1314 1315 1316 1317 1318 1319 1320 |
/** * 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... |
1321 1322 |
while (timeout) timeout = schedule_timeout_uninterruptible(timeout); |
1da177e4c Linux-2.6.12-rc2 |
1323 1324 1325 1326 1327 |
} EXPORT_SYMBOL(msleep); /** |
96ec3efdc [PATCH] kernel/ti... |
1328 |
* msleep_interruptible - sleep waiting for signals |
1da177e4c Linux-2.6.12-rc2 |
1329 1330 1331 1332 1333 |
* @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... |
1334 1335 |
while (timeout && !signal_pending(current)) timeout = schedule_timeout_interruptible(timeout); |
1da177e4c Linux-2.6.12-rc2 |
1336 1337 1338 1339 |
return jiffies_to_msecs(timeout); } EXPORT_SYMBOL(msleep_interruptible); |