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kernel/timer.c
47.5 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 <linux/irq_work.h> |
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#include <linux/sched.h> |
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#include <linux/slab.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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#define CREATE_TRACE_POINTS #include <trace/events/timer.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) |
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struct tvec { |
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struct list_head vec[TVN_SIZE]; |
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}; |
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|
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struct tvec_root { |
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struct list_head vec[TVR_SIZE]; |
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}; |
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struct tvec_base { |
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spinlock_t lock; struct timer_list *running_timer; |
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unsigned long timer_jiffies; |
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unsigned long next_timer; |
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struct tvec_root tv1; struct tvec tv2; struct tvec tv3; struct tvec tv4; struct tvec tv5; |
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} ____cacheline_aligned; |
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struct tvec_base boot_tvec_bases; |
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EXPORT_SYMBOL(boot_tvec_bases); |
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static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases; |
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/* |
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* Note that all tvec_bases are 2 byte aligned and lower bit of |
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* base in timer_list is guaranteed to be zero. Use the LSB to * indicate whether the timer is deferrable. * * A deferrable timer will work normally when the system is busy, but * will not cause a CPU to come out of idle just to service it; instead, * the timer will be serviced when the CPU eventually wakes up with a * subsequent non-deferrable timer. |
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*/ #define TBASE_DEFERRABLE_FLAG (0x1) /* Functions below help us manage 'deferrable' flag */ |
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static inline unsigned int tbase_get_deferrable(struct tvec_base *base) |
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{ |
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return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG); |
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} |
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static inline struct tvec_base *tbase_get_base(struct tvec_base *base) |
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{ |
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return ((struct tvec_base *)((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 = ((struct tvec_base *)((unsigned long)(timer->base) | |
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TBASE_DEFERRABLE_FLAG)); |
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} static inline void |
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timer_set_base(struct timer_list *timer, struct tvec_base *new_base) |
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{ |
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timer->base = (struct tvec_base *)((unsigned long)(new_base) | |
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tbase_get_deferrable(timer->base)); |
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} |
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static unsigned long round_jiffies_common(unsigned long j, int cpu, bool force_up) |
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{ 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. |
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* But never round down if @force_up is set. |
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*/ |
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if (rem < HZ/4 && !force_up) /* round down */ |
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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; } |
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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 * * __round_jiffies() rounds an absolute time in the future (in jiffies) * 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. * * The return value is the rounded version of the @j parameter. */ unsigned long __round_jiffies(unsigned long j, int cpu) { return round_jiffies_common(j, cpu, false); } |
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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) { |
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unsigned long j0 = jiffies; /* Use j0 because jiffies might change while we run */ return round_jiffies_common(j + j0, cpu, false) - j0; |
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} 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) { |
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return round_jiffies_common(j, raw_smp_processor_id(), false); |
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} 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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/** * __round_jiffies_up - function to round jiffies up to a full second * @j: the time in (absolute) jiffies that should be rounded * @cpu: the processor number on which the timeout will happen * * This is the same as __round_jiffies() except that it will never * round down. This is useful for timeouts for which the exact time * of firing does not matter too much, as long as they don't fire too * early. */ unsigned long __round_jiffies_up(unsigned long j, int cpu) { return round_jiffies_common(j, cpu, true); } EXPORT_SYMBOL_GPL(__round_jiffies_up); /** * __round_jiffies_up_relative - function to round jiffies up to a full second * @j: the time in (relative) jiffies that should be rounded * @cpu: the processor number on which the timeout will happen * * This is the same as __round_jiffies_relative() except that it will never * round down. This is useful for timeouts for which the exact time * of firing does not matter too much, as long as they don't fire too * early. */ unsigned long __round_jiffies_up_relative(unsigned long j, int cpu) { unsigned long j0 = jiffies; /* Use j0 because jiffies might change while we run */ return round_jiffies_common(j + j0, cpu, true) - j0; } EXPORT_SYMBOL_GPL(__round_jiffies_up_relative); /** * round_jiffies_up - function to round jiffies up to a full second * @j: the time in (absolute) jiffies that should be rounded * * This is the same as round_jiffies() except that it will never * round down. This is useful for timeouts for which the exact time * of firing does not matter too much, as long as they don't fire too * early. */ unsigned long round_jiffies_up(unsigned long j) { return round_jiffies_common(j, raw_smp_processor_id(), true); } EXPORT_SYMBOL_GPL(round_jiffies_up); /** * round_jiffies_up_relative - function to round jiffies up to a full second * @j: the time in (relative) jiffies that should be rounded * * This is the same as round_jiffies_relative() except that it will never * round down. This is useful for timeouts for which the exact time * of firing does not matter too much, as long as they don't fire too * early. */ unsigned long round_jiffies_up_relative(unsigned long j) { return __round_jiffies_up_relative(j, raw_smp_processor_id()); } EXPORT_SYMBOL_GPL(round_jiffies_up_relative); |
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/** * set_timer_slack - set the allowed slack for a timer |
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* @timer: the timer to be modified |
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* @slack_hz: the amount of time (in jiffies) allowed for rounding * * Set the amount of time, in jiffies, that a certain timer has * in terms of slack. By setting this value, the timer subsystem * will schedule the actual timer somewhere between * the time mod_timer() asks for, and that time plus the slack. * * By setting the slack to -1, a percentage of the delay is used * instead. */ void set_timer_slack(struct timer_list *timer, int slack_hz) { timer->slack = slack_hz; } EXPORT_SYMBOL_GPL(set_timer_slack); |
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static inline void set_running_timer(struct tvec_base *base, |
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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(struct tvec_base *base, struct timer_list *timer) |
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{ 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; |
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if (likely(!timer->start_site)) return; |
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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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#ifdef CONFIG_DEBUG_OBJECTS_TIMERS static struct debug_obj_descr timer_debug_descr; /* * fixup_init is called when: * - an active object is initialized |
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*/ |
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static int timer_fixup_init(void *addr, enum debug_obj_state state) { struct timer_list *timer = addr; switch (state) { case ODEBUG_STATE_ACTIVE: del_timer_sync(timer); debug_object_init(timer, &timer_debug_descr); return 1; default: return 0; } } /* * fixup_activate is called when: * - an active object is activated * - an unknown object is activated (might be a statically initialized object) */ static int timer_fixup_activate(void *addr, enum debug_obj_state state) { struct timer_list *timer = addr; switch (state) { case ODEBUG_STATE_NOTAVAILABLE: /* * This is not really a fixup. The timer was * statically initialized. We just make sure that it * is tracked in the object tracker. */ if (timer->entry.next == NULL && timer->entry.prev == TIMER_ENTRY_STATIC) { debug_object_init(timer, &timer_debug_descr); debug_object_activate(timer, &timer_debug_descr); return 0; } else { WARN_ON_ONCE(1); } return 0; case ODEBUG_STATE_ACTIVE: WARN_ON(1); default: return 0; } } /* * fixup_free is called when: * - an active object is freed */ static int timer_fixup_free(void *addr, enum debug_obj_state state) { struct timer_list *timer = addr; switch (state) { case ODEBUG_STATE_ACTIVE: del_timer_sync(timer); debug_object_free(timer, &timer_debug_descr); return 1; default: return 0; } } static struct debug_obj_descr timer_debug_descr = { .name = "timer_list", .fixup_init = timer_fixup_init, .fixup_activate = timer_fixup_activate, .fixup_free = timer_fixup_free, }; static inline void debug_timer_init(struct timer_list *timer) { debug_object_init(timer, &timer_debug_descr); } static inline void debug_timer_activate(struct timer_list *timer) { debug_object_activate(timer, &timer_debug_descr); } static inline void debug_timer_deactivate(struct timer_list *timer) { debug_object_deactivate(timer, &timer_debug_descr); } static inline void debug_timer_free(struct timer_list *timer) { debug_object_free(timer, &timer_debug_descr); } |
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static void __init_timer(struct timer_list *timer, const char *name, struct lock_class_key *key); |
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void init_timer_on_stack_key(struct timer_list *timer, const char *name, struct lock_class_key *key) |
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{ debug_object_init_on_stack(timer, &timer_debug_descr); |
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__init_timer(timer, name, key); |
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} |
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EXPORT_SYMBOL_GPL(init_timer_on_stack_key); |
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void destroy_timer_on_stack(struct timer_list *timer) { debug_object_free(timer, &timer_debug_descr); } EXPORT_SYMBOL_GPL(destroy_timer_on_stack); #else static inline void debug_timer_init(struct timer_list *timer) { } static inline void debug_timer_activate(struct timer_list *timer) { } static inline void debug_timer_deactivate(struct timer_list *timer) { } #endif |
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static inline void debug_init(struct timer_list *timer) { debug_timer_init(timer); trace_timer_init(timer); } static inline void debug_activate(struct timer_list *timer, unsigned long expires) { debug_timer_activate(timer); trace_timer_start(timer, expires); } static inline void debug_deactivate(struct timer_list *timer) { debug_timer_deactivate(timer); trace_timer_cancel(timer); } |
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static void __init_timer(struct timer_list *timer, const char *name, struct lock_class_key *key) |
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{ timer->entry.next = NULL; |
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timer->base = __raw_get_cpu_var(tvec_bases); |
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timer->slack = -1; |
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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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lockdep_init_map(&timer->lockdep_map, name, key, 0); |
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} |
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|
8cadd2831 timer: add on-sta... |
570 571 572 573 574 575 576 577 578 579 580 581 |
void setup_deferrable_timer_on_stack_key(struct timer_list *timer, const char *name, struct lock_class_key *key, void (*function)(unsigned long), unsigned long data) { timer->function = function; timer->data = data; init_timer_on_stack_key(timer, name, key); timer_set_deferrable(timer); } EXPORT_SYMBOL_GPL(setup_deferrable_timer_on_stack_key); |
c6f3a97f8 debugobjects: add... |
582 |
/** |
633fe795b timers: add missi... |
583 |
* init_timer_key - initialize a timer |
c6f3a97f8 debugobjects: add... |
584 |
* @timer: the timer to be initialized |
633fe795b timers: add missi... |
585 586 587 |
* @name: name of the timer * @key: lockdep class key of the fake lock used for tracking timer * sync lock dependencies |
c6f3a97f8 debugobjects: add... |
588 |
* |
633fe795b timers: add missi... |
589 |
* init_timer_key() must be done to a timer prior calling *any* of the |
c6f3a97f8 debugobjects: add... |
590 591 |
* other timer functions. */ |
6f2b9b9a9 timer: implement ... |
592 593 594 |
void init_timer_key(struct timer_list *timer, const char *name, struct lock_class_key *key) |
c6f3a97f8 debugobjects: add... |
595 |
{ |
2b022e3d4 timers: Add trace... |
596 |
debug_init(timer); |
6f2b9b9a9 timer: implement ... |
597 |
__init_timer(timer, name, key); |
c6f3a97f8 debugobjects: add... |
598 |
} |
6f2b9b9a9 timer: implement ... |
599 |
EXPORT_SYMBOL(init_timer_key); |
55c888d6d [PATCH] timers fi... |
600 |
|
6f2b9b9a9 timer: implement ... |
601 602 603 |
void init_timer_deferrable_key(struct timer_list *timer, const char *name, struct lock_class_key *key) |
6e453a675 Add support for d... |
604 |
{ |
6f2b9b9a9 timer: implement ... |
605 |
init_timer_key(timer, name, key); |
6e453a675 Add support for d... |
606 607 |
timer_set_deferrable(timer); } |
6f2b9b9a9 timer: implement ... |
608 |
EXPORT_SYMBOL(init_timer_deferrable_key); |
6e453a675 Add support for d... |
609 |
|
55c888d6d [PATCH] timers fi... |
610 |
static inline void detach_timer(struct timer_list *timer, |
82f67cd9f [PATCH] Add debug... |
611 |
int clear_pending) |
55c888d6d [PATCH] timers fi... |
612 613 |
{ struct list_head *entry = &timer->entry; |
2b022e3d4 timers: Add trace... |
614 |
debug_deactivate(timer); |
c6f3a97f8 debugobjects: add... |
615 |
|
55c888d6d [PATCH] timers fi... |
616 617 618 619 620 621 622 |
__list_del(entry->prev, entry->next); if (clear_pending) entry->next = NULL; entry->prev = LIST_POISON2; } /* |
3691c5199 [PATCH] kill __in... |
623 |
* We are using hashed locking: holding per_cpu(tvec_bases).lock |
55c888d6d [PATCH] timers fi... |
624 625 626 627 628 629 630 631 632 633 |
* 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. */ |
a6fa8e5a6 time: clean hunga... |
634 |
static struct tvec_base *lock_timer_base(struct timer_list *timer, |
55c888d6d [PATCH] timers fi... |
635 |
unsigned long *flags) |
89e7e374d [PATCH] timer: ad... |
636 |
__acquires(timer->base->lock) |
55c888d6d [PATCH] timers fi... |
637 |
{ |
a6fa8e5a6 time: clean hunga... |
638 |
struct tvec_base *base; |
55c888d6d [PATCH] timers fi... |
639 640 |
for (;;) { |
a6fa8e5a6 time: clean hunga... |
641 |
struct tvec_base *prelock_base = timer->base; |
6e453a675 Add support for d... |
642 |
base = tbase_get_base(prelock_base); |
55c888d6d [PATCH] timers fi... |
643 644 |
if (likely(base != NULL)) { spin_lock_irqsave(&base->lock, *flags); |
6e453a675 Add support for d... |
645 |
if (likely(prelock_base == timer->base)) |
55c888d6d [PATCH] timers fi... |
646 647 648 649 650 651 652 |
return base; /* The timer has migrated to another CPU */ spin_unlock_irqrestore(&base->lock, *flags); } cpu_relax(); } } |
74019224a timers: add mod_t... |
653 |
static inline int |
597d02757 timers: Framework... |
654 655 |
__mod_timer(struct timer_list *timer, unsigned long expires, bool pending_only, int pinned) |
1da177e4c Linux-2.6.12-rc2 |
656 |
{ |
a6fa8e5a6 time: clean hunga... |
657 |
struct tvec_base *base, *new_base; |
1da177e4c Linux-2.6.12-rc2 |
658 |
unsigned long flags; |
eea08f32a timers: Logic to ... |
659 |
int ret = 0 , cpu; |
1da177e4c Linux-2.6.12-rc2 |
660 |
|
82f67cd9f [PATCH] Add debug... |
661 |
timer_stats_timer_set_start_info(timer); |
1da177e4c Linux-2.6.12-rc2 |
662 |
BUG_ON(!timer->function); |
1da177e4c Linux-2.6.12-rc2 |
663 |
|
55c888d6d [PATCH] timers fi... |
664 665 666 667 |
base = lock_timer_base(timer, &flags); if (timer_pending(timer)) { detach_timer(timer, 0); |
97fd9ed48 timers: Cache __n... |
668 669 670 |
if (timer->expires == base->next_timer && !tbase_get_deferrable(timer->base)) base->next_timer = base->timer_jiffies; |
55c888d6d [PATCH] timers fi... |
671 |
ret = 1; |
74019224a timers: add mod_t... |
672 673 674 |
} else { if (pending_only) goto out_unlock; |
55c888d6d [PATCH] timers fi... |
675 |
} |
2b022e3d4 timers: Add trace... |
676 |
debug_activate(timer, expires); |
c6f3a97f8 debugobjects: add... |
677 |
|
eea08f32a timers: Logic to ... |
678 679 680 |
cpu = smp_processor_id(); #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
83cd4fe27 sched: Change noh... |
681 682 |
if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) cpu = get_nohz_timer_target(); |
eea08f32a timers: Logic to ... |
683 684 |
#endif new_base = per_cpu(tvec_bases, cpu); |
3691c5199 [PATCH] kill __in... |
685 |
if (base != new_base) { |
1da177e4c Linux-2.6.12-rc2 |
686 |
/* |
55c888d6d [PATCH] timers fi... |
687 688 689 690 691 |
* 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. |
1da177e4c Linux-2.6.12-rc2 |
692 |
*/ |
a2c348fe0 [PATCH] __mod_tim... |
693 |
if (likely(base->running_timer != timer)) { |
55c888d6d [PATCH] timers fi... |
694 |
/* See the comment in lock_timer_base() */ |
6e453a675 Add support for d... |
695 |
timer_set_base(timer, NULL); |
55c888d6d [PATCH] timers fi... |
696 |
spin_unlock(&base->lock); |
a2c348fe0 [PATCH] __mod_tim... |
697 698 |
base = new_base; spin_lock(&base->lock); |
6e453a675 Add support for d... |
699 |
timer_set_base(timer, base); |
1da177e4c Linux-2.6.12-rc2 |
700 701 |
} } |
1da177e4c Linux-2.6.12-rc2 |
702 |
timer->expires = expires; |
97fd9ed48 timers: Cache __n... |
703 704 705 |
if (time_before(timer->expires, base->next_timer) && !tbase_get_deferrable(timer->base)) base->next_timer = timer->expires; |
a2c348fe0 [PATCH] __mod_tim... |
706 |
internal_add_timer(base, timer); |
74019224a timers: add mod_t... |
707 708 |
out_unlock: |
a2c348fe0 [PATCH] __mod_tim... |
709 |
spin_unlock_irqrestore(&base->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
710 711 712 |
return ret; } |
2aae4a108 [PATCH] Fix kerne... |
713 |
/** |
74019224a timers: add mod_t... |
714 715 716 |
* mod_timer_pending - modify a pending timer's timeout * @timer: the pending timer to be modified * @expires: new timeout in jiffies |
1da177e4c Linux-2.6.12-rc2 |
717 |
* |
74019224a timers: add mod_t... |
718 719 720 721 |
* mod_timer_pending() is the same for pending timers as mod_timer(), * but will not re-activate and modify already deleted timers. * * It is useful for unserialized use of timers. |
1da177e4c Linux-2.6.12-rc2 |
722 |
*/ |
74019224a timers: add mod_t... |
723 |
int mod_timer_pending(struct timer_list *timer, unsigned long expires) |
1da177e4c Linux-2.6.12-rc2 |
724 |
{ |
597d02757 timers: Framework... |
725 |
return __mod_timer(timer, expires, true, TIMER_NOT_PINNED); |
1da177e4c Linux-2.6.12-rc2 |
726 |
} |
74019224a timers: add mod_t... |
727 |
EXPORT_SYMBOL(mod_timer_pending); |
1da177e4c Linux-2.6.12-rc2 |
728 |
|
3bbb9ec94 timers: Introduce... |
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
/* * Decide where to put the timer while taking the slack into account * * Algorithm: * 1) calculate the maximum (absolute) time * 2) calculate the highest bit where the expires and new max are different * 3) use this bit to make a mask * 4) use the bitmask to round down the maximum time, so that all last * bits are zeros */ static inline unsigned long apply_slack(struct timer_list *timer, unsigned long expires) { unsigned long expires_limit, mask; int bit; |
f00e047ef timers: Fix slack... |
744 |
expires_limit = expires; |
3bbb9ec94 timers: Introduce... |
745 |
|
8e63d7795 timers: Fix slack... |
746 |
if (timer->slack >= 0) { |
f00e047ef timers: Fix slack... |
747 |
expires_limit = expires + timer->slack; |
8e63d7795 timers: Fix slack... |
748 |
} else { |
2abfb9e1d timers: Move loca... |
749 |
unsigned long now = jiffies; |
3bbb9ec94 timers: Introduce... |
750 |
|
8e63d7795 timers: Fix slack... |
751 752 753 754 |
/* No slack, if already expired else auto slack 0.4% */ if (time_after(expires, now)) expires_limit = expires + (expires - now)/256; } |
3bbb9ec94 timers: Introduce... |
755 |
mask = expires ^ expires_limit; |
3bbb9ec94 timers: Introduce... |
756 757 758 759 760 761 762 763 764 765 766 |
if (mask == 0) return expires; bit = find_last_bit(&mask, BITS_PER_LONG); mask = (1 << bit) - 1; expires_limit = expires_limit & ~(mask); return expires_limit; } |
2aae4a108 [PATCH] Fix kerne... |
767 |
/** |
1da177e4c Linux-2.6.12-rc2 |
768 769 |
* mod_timer - modify a timer's timeout * @timer: the timer to be modified |
2aae4a108 [PATCH] Fix kerne... |
770 |
* @expires: new timeout in jiffies |
1da177e4c Linux-2.6.12-rc2 |
771 |
* |
72fd4a35a [PATCH] Numerous ... |
772 |
* mod_timer() is a more efficient way to update the expire field of an |
1da177e4c Linux-2.6.12-rc2 |
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 |
* 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) { |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 792 793 |
/* * This is a common optimization triggered by the * networking code - if the timer is re-modified * to be the same thing then just return: */ |
4841158b2 timer: Avoid read... |
794 |
if (timer_pending(timer) && timer->expires == expires) |
1da177e4c Linux-2.6.12-rc2 |
795 |
return 1; |
3bbb9ec94 timers: Introduce... |
796 |
expires = apply_slack(timer, expires); |
597d02757 timers: Framework... |
797 |
return __mod_timer(timer, expires, false, TIMER_NOT_PINNED); |
1da177e4c Linux-2.6.12-rc2 |
798 |
} |
1da177e4c Linux-2.6.12-rc2 |
799 |
EXPORT_SYMBOL(mod_timer); |
2aae4a108 [PATCH] Fix kerne... |
800 |
/** |
597d02757 timers: Framework... |
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 |
* mod_timer_pinned - modify a timer's timeout * @timer: the timer to be modified * @expires: new timeout in jiffies * * mod_timer_pinned() is a way to update the expire field of an * active timer (if the timer is inactive it will be activated) * and not allow the timer to be migrated to a different CPU. * * mod_timer_pinned(timer, expires) is equivalent to: * * del_timer(timer); timer->expires = expires; add_timer(timer); */ int mod_timer_pinned(struct timer_list *timer, unsigned long expires) { if (timer->expires == expires && timer_pending(timer)) return 1; return __mod_timer(timer, expires, false, TIMER_PINNED); } EXPORT_SYMBOL(mod_timer_pinned); /** |
74019224a timers: add mod_t... |
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 |
* add_timer - start a timer * @timer: the timer to be added * * The kernel will do a ->function(->data) callback from the * timer interrupt at the ->expires point in the future. The * current time is 'jiffies'. * * The timer's ->expires, ->function (and if the handler uses it, ->data) * fields must be set prior calling this function. * * Timers with an ->expires field in the past will be executed in the next * timer tick. */ void add_timer(struct timer_list *timer) { BUG_ON(timer_pending(timer)); mod_timer(timer, timer->expires); } EXPORT_SYMBOL(add_timer); /** * 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) { struct tvec_base *base = per_cpu(tvec_bases, cpu); unsigned long flags; timer_stats_timer_set_start_info(timer); BUG_ON(timer_pending(timer) || !timer->function); spin_lock_irqsave(&base->lock, flags); timer_set_base(timer, base); |
2b022e3d4 timers: Add trace... |
859 |
debug_activate(timer, timer->expires); |
97fd9ed48 timers: Cache __n... |
860 861 862 |
if (time_before(timer->expires, base->next_timer) && !tbase_get_deferrable(timer->base)) base->next_timer = timer->expires; |
74019224a timers: add mod_t... |
863 864 865 866 867 868 869 870 871 872 873 874 |
internal_add_timer(base, timer); /* * Check whether the other CPU is idle and needs to be * triggered to reevaluate the timer wheel when nohz is * active. We are protected against the other CPU fiddling * with the timer by holding the timer base lock. This also * makes sure that a CPU on the way to idle can not evaluate * the timer wheel. */ wake_up_idle_cpu(cpu); spin_unlock_irqrestore(&base->lock, flags); } |
a9862e056 Export add_timer_... |
875 |
EXPORT_SYMBOL_GPL(add_timer_on); |
74019224a timers: add mod_t... |
876 877 |
/** |
1da177e4c Linux-2.6.12-rc2 |
878 879 880 881 882 883 884 885 886 887 888 889 |
* 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) { |
a6fa8e5a6 time: clean hunga... |
890 |
struct tvec_base *base; |
1da177e4c Linux-2.6.12-rc2 |
891 |
unsigned long flags; |
55c888d6d [PATCH] timers fi... |
892 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
893 |
|
82f67cd9f [PATCH] Add debug... |
894 |
timer_stats_timer_clear_start_info(timer); |
55c888d6d [PATCH] timers fi... |
895 896 897 898 |
if (timer_pending(timer)) { base = lock_timer_base(timer, &flags); if (timer_pending(timer)) { detach_timer(timer, 1); |
97fd9ed48 timers: Cache __n... |
899 900 901 |
if (timer->expires == base->next_timer && !tbase_get_deferrable(timer->base)) base->next_timer = base->timer_jiffies; |
55c888d6d [PATCH] timers fi... |
902 903 |
ret = 1; } |
1da177e4c Linux-2.6.12-rc2 |
904 |
spin_unlock_irqrestore(&base->lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
905 |
} |
1da177e4c Linux-2.6.12-rc2 |
906 |
|
55c888d6d [PATCH] timers fi... |
907 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
908 |
} |
1da177e4c Linux-2.6.12-rc2 |
909 910 911 |
EXPORT_SYMBOL(del_timer); #ifdef CONFIG_SMP |
2aae4a108 [PATCH] Fix kerne... |
912 913 914 915 |
/** * try_to_del_timer_sync - Try to deactivate a timer * @timer: timer do del * |
fd450b731 [PATCH] timers: i... |
916 917 918 919 920 921 922 |
* 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) { |
a6fa8e5a6 time: clean hunga... |
923 |
struct tvec_base *base; |
fd450b731 [PATCH] timers: i... |
924 925 926 927 928 929 930 |
unsigned long flags; int ret = -1; base = lock_timer_base(timer, &flags); if (base->running_timer == timer) goto out; |
829b6c1ef timer stats: Fix ... |
931 |
timer_stats_timer_clear_start_info(timer); |
fd450b731 [PATCH] timers: i... |
932 933 934 |
ret = 0; if (timer_pending(timer)) { detach_timer(timer, 1); |
97fd9ed48 timers: Cache __n... |
935 936 937 |
if (timer->expires == base->next_timer && !tbase_get_deferrable(timer->base)) base->next_timer = base->timer_jiffies; |
fd450b731 [PATCH] timers: i... |
938 939 940 941 942 943 944 |
ret = 1; } out: spin_unlock_irqrestore(&base->lock, flags); return ret; } |
e19dff1fd [AF_RXRPC]: Make ... |
945 |
EXPORT_SYMBOL(try_to_del_timer_sync); |
2aae4a108 [PATCH] Fix kerne... |
946 |
/** |
1da177e4c Linux-2.6.12-rc2 |
947 948 949 950 951 952 953 |
* 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 ... |
954 |
* Synchronization rules: Callers must prevent restarting of the timer, |
1da177e4c Linux-2.6.12-rc2 |
955 956 |
* 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... |
957 958 959 |
* 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 |
960 961 |
* * The function returns whether it has deactivated a pending timer or not. |
1da177e4c Linux-2.6.12-rc2 |
962 963 964 |
*/ int del_timer_sync(struct timer_list *timer) { |
6f2b9b9a9 timer: implement ... |
965 966 967 968 969 970 971 972 |
#ifdef CONFIG_LOCKDEP unsigned long flags; local_irq_save(flags); lock_map_acquire(&timer->lockdep_map); lock_map_release(&timer->lockdep_map); local_irq_restore(flags); #endif |
fd450b731 [PATCH] timers: i... |
973 974 975 976 |
for (;;) { int ret = try_to_del_timer_sync(timer); if (ret >= 0) return ret; |
a0009652a [PATCH] del_timer... |
977 |
cpu_relax(); |
fd450b731 [PATCH] timers: i... |
978 |
} |
1da177e4c Linux-2.6.12-rc2 |
979 |
} |
55c888d6d [PATCH] timers fi... |
980 |
EXPORT_SYMBOL(del_timer_sync); |
1da177e4c Linux-2.6.12-rc2 |
981 |
#endif |
a6fa8e5a6 time: clean hunga... |
982 |
static int cascade(struct tvec_base *base, struct tvec *tv, int index) |
1da177e4c Linux-2.6.12-rc2 |
983 984 |
{ /* cascade all the timers from tv up one level */ |
3439dd86e [PATCH] When CONF... |
985 986 987 988 |
struct timer_list *timer, *tmp; struct list_head tv_list; list_replace_init(tv->vec + index, &tv_list); |
1da177e4c Linux-2.6.12-rc2 |
989 |
|
1da177e4c Linux-2.6.12-rc2 |
990 |
/* |
3439dd86e [PATCH] When CONF... |
991 992 |
* We are removing _all_ timers from the list, so we * don't have to detach them individually. |
1da177e4c Linux-2.6.12-rc2 |
993 |
*/ |
3439dd86e [PATCH] When CONF... |
994 |
list_for_each_entry_safe(timer, tmp, &tv_list, entry) { |
6e453a675 Add support for d... |
995 |
BUG_ON(tbase_get_base(timer->base) != base); |
3439dd86e [PATCH] When CONF... |
996 |
internal_add_timer(base, timer); |
1da177e4c Linux-2.6.12-rc2 |
997 |
} |
1da177e4c Linux-2.6.12-rc2 |
998 999 1000 |
return index; } |
576da126a timer: Split out ... |
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 |
static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long), unsigned long data) { int preempt_count = preempt_count(); #ifdef CONFIG_LOCKDEP /* * It is permissible to free the timer from inside the * function that is called from it, this we need to take into * account for lockdep too. To avoid bogus "held lock freed" * warnings as well as problems when looking into * timer->lockdep_map, make a copy and use that here. */ struct lockdep_map lockdep_map = timer->lockdep_map; #endif /* * Couple the lock chain with the lock chain at * del_timer_sync() by acquiring the lock_map around the fn() * call here and in del_timer_sync(). */ lock_map_acquire(&lockdep_map); trace_timer_expire_entry(timer); fn(data); trace_timer_expire_exit(timer); lock_map_release(&lockdep_map); if (preempt_count != preempt_count()) { |
802702e0c timer: Try to sur... |
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 |
WARN_ONCE(1, "timer: %pF preempt leak: %08x -> %08x ", fn, preempt_count, preempt_count()); /* * Restore the preempt count. That gives us a decent * chance to survive and extract information. If the * callback kept a lock held, bad luck, but not worse * than the BUG() we had. */ preempt_count() = preempt_count; |
576da126a timer: Split out ... |
1040 1041 |
} } |
2aae4a108 [PATCH] Fix kerne... |
1042 1043 1044 |
#define INDEX(N) ((base->timer_jiffies >> (TVR_BITS + (N) * TVN_BITS)) & TVN_MASK) /** |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 1047 1048 1049 1050 |
* __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. */ |
a6fa8e5a6 time: clean hunga... |
1051 |
static inline void __run_timers(struct tvec_base *base) |
1da177e4c Linux-2.6.12-rc2 |
1052 1053 |
{ struct timer_list *timer; |
3691c5199 [PATCH] kill __in... |
1054 |
spin_lock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
1055 |
while (time_after_eq(jiffies, base->timer_jiffies)) { |
626ab0e69 [PATCH] list: use... |
1056 |
struct list_head work_list; |
1da177e4c Linux-2.6.12-rc2 |
1057 |
struct list_head *head = &work_list; |
6819457d2 timer.c: cleanup ... |
1058 |
int index = base->timer_jiffies & TVR_MASK; |
626ab0e69 [PATCH] list: use... |
1059 |
|
1da177e4c Linux-2.6.12-rc2 |
1060 1061 1062 1063 1064 1065 1066 1067 |
/* * 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... |
1068 1069 |
++base->timer_jiffies; list_replace_init(base->tv1.vec + index, &work_list); |
55c888d6d [PATCH] timers fi... |
1070 |
while (!list_empty(head)) { |
1da177e4c Linux-2.6.12-rc2 |
1071 1072 |
void (*fn)(unsigned long); unsigned long data; |
b5e618181 Introduce a handy... |
1073 |
timer = list_first_entry(head, struct timer_list,entry); |
6819457d2 timer.c: cleanup ... |
1074 1075 |
fn = timer->function; data = timer->data; |
1da177e4c Linux-2.6.12-rc2 |
1076 |
|
82f67cd9f [PATCH] Add debug... |
1077 |
timer_stats_account_timer(timer); |
1da177e4c Linux-2.6.12-rc2 |
1078 |
set_running_timer(base, timer); |
55c888d6d [PATCH] timers fi... |
1079 |
detach_timer(timer, 1); |
6f2b9b9a9 timer: implement ... |
1080 |
|
3691c5199 [PATCH] kill __in... |
1081 |
spin_unlock_irq(&base->lock); |
576da126a timer: Split out ... |
1082 |
call_timer_fn(timer, fn, data); |
3691c5199 [PATCH] kill __in... |
1083 |
spin_lock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
1084 1085 1086 |
} } set_running_timer(base, NULL); |
3691c5199 [PATCH] kill __in... |
1087 |
spin_unlock_irq(&base->lock); |
1da177e4c Linux-2.6.12-rc2 |
1088 |
} |
ee9c57852 dyntick: Remove l... |
1089 |
#ifdef CONFIG_NO_HZ |
1da177e4c Linux-2.6.12-rc2 |
1090 1091 |
/* * Find out when the next timer event is due to happen. This |
90cba64a5 timer.c: Fix S/39... |
1092 1093 |
* is used on S/390 to stop all activity when a CPU is idle. * This function needs to be called with interrupts disabled. |
1da177e4c Linux-2.6.12-rc2 |
1094 |
*/ |
a6fa8e5a6 time: clean hunga... |
1095 |
static unsigned long __next_timer_interrupt(struct tvec_base *base) |
1da177e4c Linux-2.6.12-rc2 |
1096 |
{ |
1cfd68496 [PATCH] Fix casca... |
1097 |
unsigned long timer_jiffies = base->timer_jiffies; |
eaad084bb NOHZ: prevent mul... |
1098 |
unsigned long expires = timer_jiffies + NEXT_TIMER_MAX_DELTA; |
1cfd68496 [PATCH] Fix casca... |
1099 |
int index, slot, array, found = 0; |
1da177e4c Linux-2.6.12-rc2 |
1100 |
struct timer_list *nte; |
a6fa8e5a6 time: clean hunga... |
1101 |
struct tvec *varray[4]; |
1da177e4c Linux-2.6.12-rc2 |
1102 1103 |
/* Look for timer events in tv1. */ |
1cfd68496 [PATCH] Fix casca... |
1104 |
index = slot = timer_jiffies & TVR_MASK; |
1da177e4c Linux-2.6.12-rc2 |
1105 |
do { |
1cfd68496 [PATCH] Fix casca... |
1106 |
list_for_each_entry(nte, base->tv1.vec + slot, entry) { |
6819457d2 timer.c: cleanup ... |
1107 1108 |
if (tbase_get_deferrable(nte->base)) continue; |
6e453a675 Add support for d... |
1109 |
|
1cfd68496 [PATCH] Fix casca... |
1110 |
found = 1; |
1da177e4c Linux-2.6.12-rc2 |
1111 |
expires = nte->expires; |
1cfd68496 [PATCH] Fix casca... |
1112 1113 1114 1115 |
/* Look at the cascade bucket(s)? */ if (!index || slot < index) goto cascade; return expires; |
1da177e4c Linux-2.6.12-rc2 |
1116 |
} |
1cfd68496 [PATCH] Fix casca... |
1117 1118 1119 1120 1121 1122 1123 1124 |
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 |
1125 1126 1127 1128 1129 1130 |
/* Check tv2-tv5. */ varray[0] = &base->tv2; varray[1] = &base->tv3; varray[2] = &base->tv4; varray[3] = &base->tv5; |
1cfd68496 [PATCH] Fix casca... |
1131 1132 |
for (array = 0; array < 4; array++) { |
a6fa8e5a6 time: clean hunga... |
1133 |
struct tvec *varp = varray[array]; |
1cfd68496 [PATCH] Fix casca... |
1134 1135 |
index = slot = timer_jiffies & TVN_MASK; |
1da177e4c Linux-2.6.12-rc2 |
1136 |
do { |
1cfd68496 [PATCH] Fix casca... |
1137 |
list_for_each_entry(nte, varp->vec + slot, entry) { |
a04198887 timers: allow def... |
1138 1139 |
if (tbase_get_deferrable(nte->base)) continue; |
1cfd68496 [PATCH] Fix casca... |
1140 |
found = 1; |
1da177e4c Linux-2.6.12-rc2 |
1141 1142 |
if (time_before(nte->expires, expires)) expires = nte->expires; |
1cfd68496 [PATCH] Fix casca... |
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 |
} /* * 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 |
1160 |
} |
1cfd68496 [PATCH] Fix casca... |
1161 1162 |
return expires; } |
69239749e [PATCH] fix next_... |
1163 |
|
1cfd68496 [PATCH] Fix casca... |
1164 1165 1166 1167 1168 1169 1170 1171 1172 |
/* * 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:... |
1173 |
unsigned long delta; |
1cfd68496 [PATCH] Fix casca... |
1174 1175 1176 |
if (hr_delta.tv64 == KTIME_MAX) return expires; |
0662b7132 [PATCH] Fix a NO_... |
1177 |
|
9501b6cf5 [PATCH] dynticks:... |
1178 1179 1180 1181 1182 |
/* * Expired timer available, let it expire in the next tick */ if (hr_delta.tv64 <= 0) return now + 1; |
69239749e [PATCH] fix next_... |
1183 |
|
1cfd68496 [PATCH] Fix casca... |
1184 |
tsdelta = ktime_to_timespec(hr_delta); |
9501b6cf5 [PATCH] dynticks:... |
1185 |
delta = timespec_to_jiffies(&tsdelta); |
eaad084bb NOHZ: prevent mul... |
1186 1187 1188 1189 1190 1191 1192 |
/* * 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:... |
1193 1194 1195 1196 1197 1198 1199 1200 1201 |
/* * 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... |
1202 1203 |
if (time_before(now, expires)) return now; |
1da177e4c Linux-2.6.12-rc2 |
1204 1205 |
return expires; } |
1cfd68496 [PATCH] Fix casca... |
1206 1207 |
/** |
8dce39c23 time: fix inconsi... |
1208 |
* get_next_timer_interrupt - return the jiffy of the next pending timer |
05fb6bf0b [PATCH] kernel-do... |
1209 |
* @now: current time (in jiffies) |
1cfd68496 [PATCH] Fix casca... |
1210 |
*/ |
fd064b9b7 [PATCH] Extend ne... |
1211 |
unsigned long get_next_timer_interrupt(unsigned long now) |
1cfd68496 [PATCH] Fix casca... |
1212 |
{ |
a6fa8e5a6 time: clean hunga... |
1213 |
struct tvec_base *base = __get_cpu_var(tvec_bases); |
fd064b9b7 [PATCH] Extend ne... |
1214 |
unsigned long expires; |
1cfd68496 [PATCH] Fix casca... |
1215 1216 |
spin_lock(&base->lock); |
97fd9ed48 timers: Cache __n... |
1217 1218 1219 |
if (time_before_eq(base->next_timer, base->timer_jiffies)) base->next_timer = __next_timer_interrupt(base); expires = base->next_timer; |
1cfd68496 [PATCH] Fix casca... |
1220 1221 1222 1223 1224 1225 1226 |
spin_unlock(&base->lock); if (time_before_eq(expires, now)) return now; return cmp_next_hrtimer_event(now, expires); } |
1da177e4c Linux-2.6.12-rc2 |
1227 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1228 |
/* |
5b4db0c2f whitespace fixes:... |
1229 |
* Called from the timer interrupt handler to charge one tick to the current |
1da177e4c Linux-2.6.12-rc2 |
1230 1231 1232 1233 1234 1235 1236 1237 |
* 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... |
1238 |
account_process_tick(p, user_tick); |
1da177e4c Linux-2.6.12-rc2 |
1239 |
run_local_timers(); |
a157229ca rcu: Simplify rcu... |
1240 |
rcu_check_callbacks(cpu, user_tick); |
b845b517b printk: robustify... |
1241 |
printk_tick(); |
e360adbe2 irq_work: Add gen... |
1242 1243 1244 1245 |
#ifdef CONFIG_IRQ_WORK if (in_irq()) irq_work_run(); #endif |
1da177e4c Linux-2.6.12-rc2 |
1246 |
scheduler_tick(); |
6819457d2 timer.c: cleanup ... |
1247 |
run_posix_cpu_timers(p); |
1da177e4c Linux-2.6.12-rc2 |
1248 1249 1250 |
} /* |
1da177e4c Linux-2.6.12-rc2 |
1251 1252 1253 1254 |
* This function runs timers and the timer-tq in bottom half context. */ static void run_timer_softirq(struct softirq_action *h) { |
a6fa8e5a6 time: clean hunga... |
1255 |
struct tvec_base *base = __get_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
1256 |
|
d3d74453c hrtimer: fixup th... |
1257 |
hrtimer_run_pending(); |
82f67cd9f [PATCH] Add debug... |
1258 |
|
1da177e4c Linux-2.6.12-rc2 |
1259 1260 1261 1262 1263 1264 1265 1266 1267 |
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) { |
d3d74453c hrtimer: fixup th... |
1268 |
hrtimer_run_queues(); |
1da177e4c Linux-2.6.12-rc2 |
1269 1270 1271 1272 |
raise_softirq(TIMER_SOFTIRQ); } /* |
1da177e4c Linux-2.6.12-rc2 |
1273 1274 1275 1276 |
* 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 ... |
1277 |
void do_timer(unsigned long ticks) |
1da177e4c Linux-2.6.12-rc2 |
1278 |
{ |
3171a0305 [PATCH] simplify ... |
1279 |
jiffies_64 += ticks; |
dce48a84a sched, timers: mo... |
1280 1281 |
update_wall_time(); calc_global_load(); |
1da177e4c Linux-2.6.12-rc2 |
1282 1283 1284 1285 1286 1287 1288 1289 |
} #ifdef __ARCH_WANT_SYS_ALARM /* * For backwards compatibility? This can be done in libc so Alpha * and all newer ports shouldn't need it. */ |
58fd3aa28 [CVE-2009-0029] S... |
1290 |
SYSCALL_DEFINE1(alarm, unsigned int, seconds) |
1da177e4c Linux-2.6.12-rc2 |
1291 |
{ |
c08b8a491 [PATCH] sys_alarm... |
1292 |
return alarm_setitimer(seconds); |
1da177e4c Linux-2.6.12-rc2 |
1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 |
} #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. */ |
58fd3aa28 [CVE-2009-0029] S... |
1313 |
SYSCALL_DEFINE0(getpid) |
1da177e4c Linux-2.6.12-rc2 |
1314 |
{ |
b488893a3 pid namespaces: c... |
1315 |
return task_tgid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
1316 1317 1318 |
} /* |
6997a6faa [PATCH] sys_getpp... |
1319 1320 1321 1322 |
* 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 |
1323 |
*/ |
dbf040d9d [CVE-2009-0029] S... |
1324 |
SYSCALL_DEFINE0(getppid) |
1da177e4c Linux-2.6.12-rc2 |
1325 1326 |
{ int pid; |
1da177e4c Linux-2.6.12-rc2 |
1327 |
|
6997a6faa [PATCH] sys_getpp... |
1328 |
rcu_read_lock(); |
6c5f3e7b4 Pidns: make full ... |
1329 |
pid = task_tgid_vnr(current->real_parent); |
6997a6faa [PATCH] sys_getpp... |
1330 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
1331 |
|
1da177e4c Linux-2.6.12-rc2 |
1332 1333 |
return pid; } |
dbf040d9d [CVE-2009-0029] S... |
1334 |
SYSCALL_DEFINE0(getuid) |
1da177e4c Linux-2.6.12-rc2 |
1335 1336 |
{ /* Only we change this so SMP safe */ |
76aac0e9a CRED: Wrap task c... |
1337 |
return current_uid(); |
1da177e4c Linux-2.6.12-rc2 |
1338 |
} |
dbf040d9d [CVE-2009-0029] S... |
1339 |
SYSCALL_DEFINE0(geteuid) |
1da177e4c Linux-2.6.12-rc2 |
1340 1341 |
{ /* Only we change this so SMP safe */ |
76aac0e9a CRED: Wrap task c... |
1342 |
return current_euid(); |
1da177e4c Linux-2.6.12-rc2 |
1343 |
} |
dbf040d9d [CVE-2009-0029] S... |
1344 |
SYSCALL_DEFINE0(getgid) |
1da177e4c Linux-2.6.12-rc2 |
1345 1346 |
{ /* Only we change this so SMP safe */ |
76aac0e9a CRED: Wrap task c... |
1347 |
return current_gid(); |
1da177e4c Linux-2.6.12-rc2 |
1348 |
} |
dbf040d9d [CVE-2009-0029] S... |
1349 |
SYSCALL_DEFINE0(getegid) |
1da177e4c Linux-2.6.12-rc2 |
1350 1351 |
{ /* Only we change this so SMP safe */ |
76aac0e9a CRED: Wrap task c... |
1352 |
return current_egid(); |
1da177e4c Linux-2.6.12-rc2 |
1353 1354 1355 1356 1357 1358 |
} #endif static void process_timeout(unsigned long __data) { |
36c8b5868 [PATCH] sched: cl... |
1359 |
wake_up_process((struct task_struct *)__data); |
1da177e4c Linux-2.6.12-rc2 |
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 |
} /** * 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. */ |
7ad5b3a50 kernel: remove fa... |
1388 |
signed long __sched schedule_timeout(signed long timeout) |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 |
{ 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_... |
1413 |
if (timeout < 0) { |
1da177e4c Linux-2.6.12-rc2 |
1414 |
printk(KERN_ERR "schedule_timeout: wrong timeout " |
5b149bcc2 [PATCH] schedule_... |
1415 1416 1417 |
"value %lx ", timeout); dump_stack(); |
1da177e4c Linux-2.6.12-rc2 |
1418 1419 1420 1421 1422 1423 |
current->state = TASK_RUNNING; goto out; } } expire = timeout + jiffies; |
c6f3a97f8 debugobjects: add... |
1424 |
setup_timer_on_stack(&timer, process_timeout, (unsigned long)current); |
597d02757 timers: Framework... |
1425 |
__mod_timer(&timer, expire, false, TIMER_NOT_PINNED); |
1da177e4c Linux-2.6.12-rc2 |
1426 1427 |
schedule(); del_singleshot_timer_sync(&timer); |
c6f3a97f8 debugobjects: add... |
1428 1429 |
/* Remove the timer from the object tracker */ destroy_timer_on_stack(&timer); |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 1432 1433 1434 |
timeout = expire - jiffies; out: return timeout < 0 ? 0 : timeout; } |
1da177e4c Linux-2.6.12-rc2 |
1435 |
EXPORT_SYMBOL(schedule_timeout); |
8a1c17574 [PATCH] schedule_... |
1436 1437 1438 1439 |
/* * We can use __set_current_state() here because schedule_timeout() calls * schedule() unconditionally. */ |
64ed93a26 [PATCH] add sched... |
1440 1441 |
signed long __sched schedule_timeout_interruptible(signed long timeout) { |
a5a0d52c7 [PATCH] ntp white... |
1442 1443 |
__set_current_state(TASK_INTERRUPTIBLE); return schedule_timeout(timeout); |
64ed93a26 [PATCH] add sched... |
1444 1445 |
} EXPORT_SYMBOL(schedule_timeout_interruptible); |
294d5cc23 Add schedule_time... |
1446 1447 1448 1449 1450 1451 |
signed long __sched schedule_timeout_killable(signed long timeout) { __set_current_state(TASK_KILLABLE); return schedule_timeout(timeout); } EXPORT_SYMBOL(schedule_timeout_killable); |
64ed93a26 [PATCH] add sched... |
1452 1453 |
signed long __sched schedule_timeout_uninterruptible(signed long timeout) { |
a5a0d52c7 [PATCH] ntp white... |
1454 1455 |
__set_current_state(TASK_UNINTERRUPTIBLE); return schedule_timeout(timeout); |
64ed93a26 [PATCH] add sched... |
1456 1457 |
} EXPORT_SYMBOL(schedule_timeout_uninterruptible); |
1da177e4c Linux-2.6.12-rc2 |
1458 |
/* Thread ID - the internal kernel "pid" */ |
58fd3aa28 [CVE-2009-0029] S... |
1459 |
SYSCALL_DEFINE0(gettid) |
1da177e4c Linux-2.6.12-rc2 |
1460 |
{ |
b488893a3 pid namespaces: c... |
1461 |
return task_pid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
1462 |
} |
2aae4a108 [PATCH] Fix kerne... |
1463 |
/** |
d4d23add3 [PATCH] Common co... |
1464 |
* do_sysinfo - fill in sysinfo struct |
2aae4a108 [PATCH] Fix kerne... |
1465 |
* @info: pointer to buffer to fill |
6819457d2 timer.c: cleanup ... |
1466 |
*/ |
d4d23add3 [PATCH] Common co... |
1467 |
int do_sysinfo(struct sysinfo *info) |
1da177e4c Linux-2.6.12-rc2 |
1468 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1469 1470 |
unsigned long mem_total, sav_total; unsigned int mem_unit, bitcount; |
2d02494f5 sched, timers: cl... |
1471 |
struct timespec tp; |
1da177e4c Linux-2.6.12-rc2 |
1472 |
|
d4d23add3 [PATCH] Common co... |
1473 |
memset(info, 0, sizeof(struct sysinfo)); |
1da177e4c Linux-2.6.12-rc2 |
1474 |
|
2d02494f5 sched, timers: cl... |
1475 1476 1477 |
ktime_get_ts(&tp); monotonic_to_bootbased(&tp); info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
1da177e4c Linux-2.6.12-rc2 |
1478 |
|
2d02494f5 sched, timers: cl... |
1479 |
get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); |
1da177e4c Linux-2.6.12-rc2 |
1480 |
|
2d02494f5 sched, timers: cl... |
1481 |
info->procs = nr_threads; |
1da177e4c Linux-2.6.12-rc2 |
1482 |
|
d4d23add3 [PATCH] Common co... |
1483 1484 |
si_meminfo(info); si_swapinfo(info); |
1da177e4c Linux-2.6.12-rc2 |
1485 1486 1487 1488 1489 1490 1491 1492 1493 |
/* * 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... |
1494 1495 |
mem_total = info->totalram + info->totalswap; if (mem_total < info->totalram || mem_total < info->totalswap) |
1da177e4c Linux-2.6.12-rc2 |
1496 1497 |
goto out; bitcount = 0; |
d4d23add3 [PATCH] Common co... |
1498 |
mem_unit = info->mem_unit; |
1da177e4c Linux-2.6.12-rc2 |
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 |
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... |
1510 |
* info->mem_unit and set it to 1. This leaves things compatible |
1da177e4c Linux-2.6.12-rc2 |
1511 1512 1513 |
* with 2.2.x, and also retains compatibility with earlier 2.4.x * kernels... */ |
d4d23add3 [PATCH] Common co... |
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 |
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; } |
1e7bfb213 [CVE-2009-0029] S... |
1527 |
SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) |
d4d23add3 [PATCH] Common co... |
1528 1529 1530 1531 |
{ struct sysinfo val; do_sysinfo(&val); |
1da177e4c Linux-2.6.12-rc2 |
1532 |
|
1da177e4c Linux-2.6.12-rc2 |
1533 1534 1535 1536 1537 |
if (copy_to_user(info, &val, sizeof(struct sysinfo))) return -EFAULT; return 0; } |
b4be62585 timer: kernel/tim... |
1538 |
static int __cpuinit init_timers_cpu(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1539 1540 |
{ int j; |
a6fa8e5a6 time: clean hunga... |
1541 |
struct tvec_base *base; |
b4be62585 timer: kernel/tim... |
1542 |
static char __cpuinitdata tvec_base_done[NR_CPUS]; |
55c888d6d [PATCH] timers fi... |
1543 |
|
ba6edfcd1 [PATCH] timer ini... |
1544 |
if (!tvec_base_done[cpu]) { |
a4a6198b8 [PATCH] tvec_base... |
1545 |
static char boot_done; |
a4a6198b8 [PATCH] tvec_base... |
1546 |
if (boot_done) { |
ba6edfcd1 [PATCH] timer ini... |
1547 1548 1549 |
/* * The APs use this path later in boot */ |
94f6030ca Slab allocators: ... |
1550 1551 |
base = kmalloc_node(sizeof(*base), GFP_KERNEL | __GFP_ZERO, |
a4a6198b8 [PATCH] tvec_base... |
1552 1553 1554 |
cpu_to_node(cpu)); if (!base) return -ENOMEM; |
6e453a675 Add support for d... |
1555 1556 1557 1558 1559 1560 1561 |
/* 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... |
1562 |
per_cpu(tvec_bases, cpu) = base; |
a4a6198b8 [PATCH] tvec_base... |
1563 |
} else { |
ba6edfcd1 [PATCH] timer ini... |
1564 1565 1566 1567 1568 1569 |
/* * 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... |
1570 |
boot_done = 1; |
ba6edfcd1 [PATCH] timer ini... |
1571 |
base = &boot_tvec_bases; |
a4a6198b8 [PATCH] tvec_base... |
1572 |
} |
ba6edfcd1 [PATCH] timer ini... |
1573 1574 1575 |
tvec_base_done[cpu] = 1; } else { base = per_cpu(tvec_bases, cpu); |
a4a6198b8 [PATCH] tvec_base... |
1576 |
} |
ba6edfcd1 [PATCH] timer ini... |
1577 |
|
3691c5199 [PATCH] kill __in... |
1578 |
spin_lock_init(&base->lock); |
d730e882a [PATCH] lockdep: ... |
1579 |
|
1da177e4c Linux-2.6.12-rc2 |
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 |
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; |
97fd9ed48 timers: Cache __n... |
1590 |
base->next_timer = base->timer_jiffies; |
a4a6198b8 [PATCH] tvec_base... |
1591 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1592 1593 1594 |
} #ifdef CONFIG_HOTPLUG_CPU |
a6fa8e5a6 time: clean hunga... |
1595 |
static void migrate_timer_list(struct tvec_base *new_base, struct list_head *head) |
1da177e4c Linux-2.6.12-rc2 |
1596 1597 1598 1599 |
{ struct timer_list *timer; while (!list_empty(head)) { |
b5e618181 Introduce a handy... |
1600 |
timer = list_first_entry(head, struct timer_list, entry); |
55c888d6d [PATCH] timers fi... |
1601 |
detach_timer(timer, 0); |
6e453a675 Add support for d... |
1602 |
timer_set_base(timer, new_base); |
97fd9ed48 timers: Cache __n... |
1603 1604 1605 |
if (time_before(timer->expires, new_base->next_timer) && !tbase_get_deferrable(timer->base)) new_base->next_timer = timer->expires; |
1da177e4c Linux-2.6.12-rc2 |
1606 |
internal_add_timer(new_base, timer); |
1da177e4c Linux-2.6.12-rc2 |
1607 |
} |
1da177e4c Linux-2.6.12-rc2 |
1608 |
} |
48ccf3dac timer: fix sectio... |
1609 |
static void __cpuinit migrate_timers(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1610 |
{ |
a6fa8e5a6 time: clean hunga... |
1611 1612 |
struct tvec_base *old_base; struct tvec_base *new_base; |
1da177e4c Linux-2.6.12-rc2 |
1613 1614 1615 |
int i; BUG_ON(cpu_online(cpu)); |
a4a6198b8 [PATCH] tvec_base... |
1616 1617 |
old_base = per_cpu(tvec_bases, cpu); new_base = get_cpu_var(tvec_bases); |
d82f0b0f6 migrate_timers: a... |
1618 1619 1620 1621 1622 |
/* * The caller is globally serialized and nobody else * takes two locks at once, deadlock is not possible. */ spin_lock_irq(&new_base->lock); |
0d180406f timers: simplify ... |
1623 |
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING); |
3691c5199 [PATCH] kill __in... |
1624 1625 |
BUG_ON(old_base->running_timer); |
1da177e4c Linux-2.6.12-rc2 |
1626 |
|
1da177e4c Linux-2.6.12-rc2 |
1627 |
for (i = 0; i < TVR_SIZE; i++) |
55c888d6d [PATCH] timers fi... |
1628 1629 1630 1631 1632 1633 1634 |
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); } |
0d180406f timers: simplify ... |
1635 |
spin_unlock(&old_base->lock); |
d82f0b0f6 migrate_timers: a... |
1636 |
spin_unlock_irq(&new_base->lock); |
1da177e4c Linux-2.6.12-rc2 |
1637 |
put_cpu_var(tvec_bases); |
1da177e4c Linux-2.6.12-rc2 |
1638 1639 |
} #endif /* CONFIG_HOTPLUG_CPU */ |
8c78f3075 [PATCH] cpu hotpl... |
1640 |
static int __cpuinit timer_cpu_notify(struct notifier_block *self, |
1da177e4c Linux-2.6.12-rc2 |
1641 1642 1643 |
unsigned long action, void *hcpu) { long cpu = (long)hcpu; |
80b5184cc kernel/: convert ... |
1644 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
1645 1646 |
switch(action) { case CPU_UP_PREPARE: |
8bb784428 Add suspend-relat... |
1647 |
case CPU_UP_PREPARE_FROZEN: |
80b5184cc kernel/: convert ... |
1648 1649 1650 |
err = init_timers_cpu(cpu); if (err < 0) return notifier_from_errno(err); |
1da177e4c Linux-2.6.12-rc2 |
1651 1652 1653 |
break; #ifdef CONFIG_HOTPLUG_CPU case CPU_DEAD: |
8bb784428 Add suspend-relat... |
1654 |
case CPU_DEAD_FROZEN: |
1da177e4c Linux-2.6.12-rc2 |
1655 1656 1657 1658 1659 1660 1661 1662 |
migrate_timers(cpu); break; #endif default: break; } return NOTIFY_OK; } |
8c78f3075 [PATCH] cpu hotpl... |
1663 |
static struct notifier_block __cpuinitdata timers_nb = { |
1da177e4c Linux-2.6.12-rc2 |
1664 1665 1666 1667 1668 1669 |
.notifier_call = timer_cpu_notify, }; void __init init_timers(void) { |
07dccf334 [PATCH] check ret... |
1670 |
int err = timer_cpu_notify(&timers_nb, (unsigned long)CPU_UP_PREPARE, |
1da177e4c Linux-2.6.12-rc2 |
1671 |
(void *)(long)smp_processor_id()); |
07dccf334 [PATCH] check ret... |
1672 |
|
82f67cd9f [PATCH] Add debug... |
1673 |
init_timer_stats(); |
9e506f7ad kernel/: fix BUG_... |
1674 |
BUG_ON(err != NOTIFY_OK); |
1da177e4c Linux-2.6.12-rc2 |
1675 |
register_cpu_notifier(&timers_nb); |
962cf36c5 Remove argument f... |
1676 |
open_softirq(TIMER_SOFTIRQ, run_timer_softirq); |
1da177e4c Linux-2.6.12-rc2 |
1677 |
} |
1da177e4c Linux-2.6.12-rc2 |
1678 1679 1680 1681 1682 1683 1684 |
/** * 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... |
1685 1686 |
while (timeout) timeout = schedule_timeout_uninterruptible(timeout); |
1da177e4c Linux-2.6.12-rc2 |
1687 1688 1689 1690 1691 |
} EXPORT_SYMBOL(msleep); /** |
96ec3efdc [PATCH] kernel/ti... |
1692 |
* msleep_interruptible - sleep waiting for signals |
1da177e4c Linux-2.6.12-rc2 |
1693 1694 1695 1696 1697 |
* @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... |
1698 1699 |
while (timeout && !signal_pending(current)) timeout = schedule_timeout_interruptible(timeout); |
1da177e4c Linux-2.6.12-rc2 |
1700 1701 1702 1703 |
return jiffies_to_msecs(timeout); } EXPORT_SYMBOL(msleep_interruptible); |
5e7f5a178 timer: Added usle... |
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 |
static int __sched do_usleep_range(unsigned long min, unsigned long max) { ktime_t kmin; unsigned long delta; kmin = ktime_set(0, min * NSEC_PER_USEC); delta = (max - min) * NSEC_PER_USEC; return schedule_hrtimeout_range(&kmin, delta, HRTIMER_MODE_REL); } /** * usleep_range - Drop in replacement for udelay where wakeup is flexible * @min: Minimum time in usecs to sleep * @max: Maximum time in usecs to sleep */ void usleep_range(unsigned long min, unsigned long max) { __set_current_state(TASK_UNINTERRUPTIBLE); do_usleep_range(min, max); } EXPORT_SYMBOL(usleep_range); |