[PATCH] hrtimers: cleanup locking
Improve kernel/hrtimers.c locking: use a per-CPU base with a lock to control locking of all clocks belonging to a CPU. This simplifies code that needs to lock all clocks at once. This makes life easier for high-res timers and dyntick. No functional changes. [ optimization change from Andrew Morton <akpm@osdl.org> ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner
Linus Torvalds
Родитель
c9cb2e3d7c
Коммит
3c8aa39d7c
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@ -21,6 +21,9 @@
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#include <linux/list.h>
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#include <linux/wait.h>
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struct hrtimer_clock_base;
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struct hrtimer_cpu_base;
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/*
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* Mode arguments of xxx_hrtimer functions:
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*/
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@ -37,8 +40,6 @@ enum hrtimer_restart {
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HRTIMER_RESTART, /* Timer must be restarted */
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};
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struct hrtimer_base;
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/**
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* struct hrtimer - the basic hrtimer structure
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* @node: red black tree node for time ordered insertion
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@ -51,10 +52,10 @@ struct hrtimer_base;
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* The hrtimer structure must be initialized by init_hrtimer_#CLOCKTYPE()
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*/
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struct hrtimer {
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struct rb_node node;
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ktime_t expires;
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enum hrtimer_restart (*function)(struct hrtimer *);
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struct hrtimer_base *base;
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struct rb_node node;
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ktime_t expires;
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enum hrtimer_restart (*function)(struct hrtimer *);
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struct hrtimer_clock_base *base;
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};
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/**
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@ -71,29 +72,41 @@ struct hrtimer_sleeper {
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/**
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* struct hrtimer_base - the timer base for a specific clock
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* @index: clock type index for per_cpu support when moving a timer
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* to a base on another cpu.
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* @lock: lock protecting the base and associated timers
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* @index: clock type index for per_cpu support when moving a
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* timer to a base on another cpu.
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* @active: red black tree root node for the active timers
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* @first: pointer to the timer node which expires first
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* @resolution: the resolution of the clock, in nanoseconds
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* @get_time: function to retrieve the current time of the clock
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* @get_softirq_time: function to retrieve the current time from the softirq
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* @curr_timer: the timer which is executing a callback right now
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* @softirq_time: the time when running the hrtimer queue in the softirq
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* @lock_key: the lock_class_key for use with lockdep
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*/
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struct hrtimer_base {
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struct hrtimer_clock_base {
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struct hrtimer_cpu_base *cpu_base;
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clockid_t index;
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spinlock_t lock;
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struct rb_root active;
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struct rb_node *first;
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ktime_t resolution;
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ktime_t (*get_time)(void);
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ktime_t (*get_softirq_time)(void);
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struct hrtimer *curr_timer;
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ktime_t softirq_time;
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struct lock_class_key lock_key;
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};
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#define HRTIMER_MAX_CLOCK_BASES 2
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/*
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* struct hrtimer_cpu_base - the per cpu clock bases
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* @lock: lock protecting the base and associated clock bases
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* and timers
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* @lock_key: the lock_class_key for use with lockdep
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* @clock_base: array of clock bases for this cpu
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* @curr_timer: the timer which is executing a callback right now
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*/
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struct hrtimer_cpu_base {
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spinlock_t lock;
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struct lock_class_key lock_key;
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struct hrtimer_clock_base clock_base[HRTIMER_MAX_CLOCK_BASES];
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struct hrtimer *curr_timer;
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};
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/*
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184
kernel/hrtimer.c
184
kernel/hrtimer.c
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@ -1,8 +1,9 @@
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/*
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* linux/kernel/hrtimer.c
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*
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* Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
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* Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
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* Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
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* Copyright(C) 2005-2006, Red Hat, Inc., Ingo Molnar
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* Copyright(C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
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*
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* High-resolution kernel timers
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*
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@ -79,21 +80,22 @@ EXPORT_SYMBOL_GPL(ktime_get_real);
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* This ensures that we capture erroneous accesses to these clock ids
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* rather than moving them into the range of valid clock id's.
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*/
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#define MAX_HRTIMER_BASES 2
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static DEFINE_PER_CPU(struct hrtimer_base, hrtimer_bases[MAX_HRTIMER_BASES]) =
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static DEFINE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases) =
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{
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.clock_base =
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{
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.index = CLOCK_REALTIME,
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.get_time = &ktime_get_real,
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.resolution = KTIME_REALTIME_RES,
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},
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{
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.index = CLOCK_MONOTONIC,
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.get_time = &ktime_get,
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.resolution = KTIME_MONOTONIC_RES,
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},
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{
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.index = CLOCK_REALTIME,
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.get_time = &ktime_get_real,
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.resolution = KTIME_REALTIME_RES,
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},
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{
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.index = CLOCK_MONOTONIC,
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.get_time = &ktime_get,
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.resolution = KTIME_MONOTONIC_RES,
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},
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}
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};
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/**
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@ -125,7 +127,7 @@ EXPORT_SYMBOL_GPL(ktime_get_ts);
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* Get the coarse grained time at the softirq based on xtime and
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* wall_to_monotonic.
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*/
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static void hrtimer_get_softirq_time(struct hrtimer_base *base)
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static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
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{
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ktime_t xtim, tomono;
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struct timespec xts;
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@ -142,8 +144,9 @@ static void hrtimer_get_softirq_time(struct hrtimer_base *base)
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xtim = timespec_to_ktime(xts);
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tomono = timespec_to_ktime(wall_to_monotonic);
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base[CLOCK_REALTIME].softirq_time = xtim;
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base[CLOCK_MONOTONIC].softirq_time = ktime_add(xtim, tomono);
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base->clock_base[CLOCK_REALTIME].softirq_time = xtim;
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base->clock_base[CLOCK_MONOTONIC].softirq_time =
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ktime_add(xtim, tomono);
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}
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/*
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@ -166,19 +169,20 @@ static void hrtimer_get_softirq_time(struct hrtimer_base *base)
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* possible to set timer->base = NULL and drop the lock: the timer remains
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* locked.
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*/
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static struct hrtimer_base *lock_hrtimer_base(const struct hrtimer *timer,
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unsigned long *flags)
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static
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struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
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unsigned long *flags)
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{
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struct hrtimer_base *base;
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struct hrtimer_clock_base *base;
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for (;;) {
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base = timer->base;
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if (likely(base != NULL)) {
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spin_lock_irqsave(&base->lock, *flags);
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spin_lock_irqsave(&base->cpu_base->lock, *flags);
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if (likely(base == timer->base))
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return base;
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/* The timer has migrated to another CPU: */
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spin_unlock_irqrestore(&base->lock, *flags);
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spin_unlock_irqrestore(&base->cpu_base->lock, *flags);
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}
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cpu_relax();
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}
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@ -187,12 +191,14 @@ static struct hrtimer_base *lock_hrtimer_base(const struct hrtimer *timer,
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/*
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* Switch the timer base to the current CPU when possible.
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*/
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static inline struct hrtimer_base *
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switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_base *base)
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static inline struct hrtimer_clock_base *
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switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base)
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{
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struct hrtimer_base *new_base;
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struct hrtimer_clock_base *new_base;
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struct hrtimer_cpu_base *new_cpu_base;
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new_base = &__get_cpu_var(hrtimer_bases)[base->index];
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new_cpu_base = &__get_cpu_var(hrtimer_bases);
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new_base = &new_cpu_base->clock_base[base->index];
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if (base != new_base) {
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/*
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@ -204,13 +210,13 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_base *base)
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* completed. There is no conflict as we hold the lock until
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* the timer is enqueued.
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*/
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if (unlikely(base->curr_timer == timer))
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if (unlikely(base->cpu_base->curr_timer == timer))
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return base;
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/* See the comment in lock_timer_base() */
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timer->base = NULL;
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spin_unlock(&base->lock);
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spin_lock(&new_base->lock);
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spin_unlock(&base->cpu_base->lock);
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spin_lock(&new_base->cpu_base->lock);
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timer->base = new_base;
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}
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return new_base;
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@ -220,12 +226,12 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_base *base)
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#define set_curr_timer(b, t) do { } while (0)
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static inline struct hrtimer_base *
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static inline struct hrtimer_clock_base *
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lock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
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{
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struct hrtimer_base *base = timer->base;
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struct hrtimer_clock_base *base = timer->base;
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spin_lock_irqsave(&base->lock, *flags);
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spin_lock_irqsave(&base->cpu_base->lock, *flags);
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return base;
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}
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@ -305,7 +311,7 @@ void hrtimer_notify_resume(void)
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static inline
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void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
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{
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spin_unlock_irqrestore(&timer->base->lock, *flags);
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spin_unlock_irqrestore(&timer->base->cpu_base->lock, *flags);
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}
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/**
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@ -355,7 +361,8 @@ hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
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* The timer is inserted in expiry order. Insertion into the
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* red black tree is O(log(n)). Must hold the base lock.
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*/
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static void enqueue_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
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static void enqueue_hrtimer(struct hrtimer *timer,
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struct hrtimer_clock_base *base)
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{
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struct rb_node **link = &base->active.rb_node;
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struct rb_node *parent = NULL;
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@ -394,7 +401,8 @@ static void enqueue_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
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*
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* Caller must hold the base lock.
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*/
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static void __remove_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
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static void __remove_hrtimer(struct hrtimer *timer,
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struct hrtimer_clock_base *base)
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{
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/*
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* Remove the timer from the rbtree and replace the
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@ -410,7 +418,7 @@ static void __remove_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
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* remove hrtimer, called with base lock held
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*/
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static inline int
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remove_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
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remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base)
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{
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if (hrtimer_active(timer)) {
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__remove_hrtimer(timer, base);
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@ -432,7 +440,7 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_base *base)
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int
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hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
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{
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struct hrtimer_base *base, *new_base;
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struct hrtimer_clock_base *base, *new_base;
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unsigned long flags;
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int ret;
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@ -479,13 +487,13 @@ EXPORT_SYMBOL_GPL(hrtimer_start);
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*/
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int hrtimer_try_to_cancel(struct hrtimer *timer)
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{
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struct hrtimer_base *base;
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struct hrtimer_clock_base *base;
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unsigned long flags;
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int ret = -1;
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base = lock_hrtimer_base(timer, &flags);
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if (base->curr_timer != timer)
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if (base->cpu_base->curr_timer != timer)
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ret = remove_hrtimer(timer, base);
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unlock_hrtimer_base(timer, &flags);
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@ -521,12 +529,12 @@ EXPORT_SYMBOL_GPL(hrtimer_cancel);
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*/
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ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
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{
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struct hrtimer_base *base;
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struct hrtimer_clock_base *base;
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unsigned long flags;
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ktime_t rem;
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base = lock_hrtimer_base(timer, &flags);
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rem = ktime_sub(timer->expires, timer->base->get_time());
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rem = ktime_sub(timer->expires, base->get_time());
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unlock_hrtimer_base(timer, &flags);
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return rem;
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@ -542,26 +550,29 @@ EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
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*/
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ktime_t hrtimer_get_next_event(void)
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{
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struct hrtimer_base *base = __get_cpu_var(hrtimer_bases);
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struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
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struct hrtimer_clock_base *base = cpu_base->clock_base;
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ktime_t delta, mindelta = { .tv64 = KTIME_MAX };
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unsigned long flags;
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int i;
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for (i = 0; i < MAX_HRTIMER_BASES; i++, base++) {
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spin_lock_irqsave(&cpu_base->lock, flags);
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for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++, base++) {
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struct hrtimer *timer;
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spin_lock_irqsave(&base->lock, flags);
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if (!base->first) {
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spin_unlock_irqrestore(&base->lock, flags);
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if (!base->first)
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continue;
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}
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timer = rb_entry(base->first, struct hrtimer, node);
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delta.tv64 = timer->expires.tv64;
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spin_unlock_irqrestore(&base->lock, flags);
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delta = ktime_sub(delta, base->get_time());
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if (delta.tv64 < mindelta.tv64)
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mindelta.tv64 = delta.tv64;
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}
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spin_unlock_irqrestore(&cpu_base->lock, flags);
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if (mindelta.tv64 < 0)
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mindelta.tv64 = 0;
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return mindelta;
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@ -577,16 +588,16 @@ ktime_t hrtimer_get_next_event(void)
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void hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
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enum hrtimer_mode mode)
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{
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struct hrtimer_base *bases;
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struct hrtimer_cpu_base *cpu_base;
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memset(timer, 0, sizeof(struct hrtimer));
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bases = __raw_get_cpu_var(hrtimer_bases);
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cpu_base = &__raw_get_cpu_var(hrtimer_bases);
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if (clock_id == CLOCK_REALTIME && mode != HRTIMER_MODE_ABS)
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clock_id = CLOCK_MONOTONIC;
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timer->base = &bases[clock_id];
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timer->base = &cpu_base->clock_base[clock_id];
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rb_set_parent(&timer->node, &timer->node);
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}
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EXPORT_SYMBOL_GPL(hrtimer_init);
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@ -601,10 +612,10 @@ EXPORT_SYMBOL_GPL(hrtimer_init);
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*/
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int hrtimer_get_res(const clockid_t which_clock, struct timespec *tp)
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{
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struct hrtimer_base *bases;
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struct hrtimer_cpu_base *cpu_base;
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bases = __raw_get_cpu_var(hrtimer_bases);
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*tp = ktime_to_timespec(bases[which_clock].resolution);
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cpu_base = &__raw_get_cpu_var(hrtimer_bases);
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*tp = ktime_to_timespec(cpu_base->clock_base[which_clock].resolution);
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return 0;
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}
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@ -613,9 +624,11 @@ EXPORT_SYMBOL_GPL(hrtimer_get_res);
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/*
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* Expire the per base hrtimer-queue:
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*/
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static inline void run_hrtimer_queue(struct hrtimer_base *base)
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static inline void run_hrtimer_queue(struct hrtimer_cpu_base *cpu_base,
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int index)
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{
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struct rb_node *node;
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struct hrtimer_clock_base *base = &cpu_base->clock_base[index];
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if (!base->first)
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return;
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@ -623,7 +636,7 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
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if (base->get_softirq_time)
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base->softirq_time = base->get_softirq_time();
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spin_lock_irq(&base->lock);
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spin_lock_irq(&cpu_base->lock);
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while ((node = base->first)) {
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struct hrtimer *timer;
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@ -635,21 +648,21 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
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break;
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fn = timer->function;
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set_curr_timer(base, timer);
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set_curr_timer(cpu_base, timer);
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__remove_hrtimer(timer, base);
|
||||
spin_unlock_irq(&base->lock);
|
||||
spin_unlock_irq(&cpu_base->lock);
|
||||
|
||||
restart = fn(timer);
|
||||
|
||||
spin_lock_irq(&base->lock);
|
||||
spin_lock_irq(&cpu_base->lock);
|
||||
|
||||
if (restart != HRTIMER_NORESTART) {
|
||||
BUG_ON(hrtimer_active(timer));
|
||||
enqueue_hrtimer(timer, base);
|
||||
}
|
||||
}
|
||||
set_curr_timer(base, NULL);
|
||||
spin_unlock_irq(&base->lock);
|
||||
set_curr_timer(cpu_base, NULL);
|
||||
spin_unlock_irq(&cpu_base->lock);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -657,13 +670,13 @@ static inline void run_hrtimer_queue(struct hrtimer_base *base)
|
|||
*/
|
||||
void hrtimer_run_queues(void)
|
||||
{
|
||||
struct hrtimer_base *base = __get_cpu_var(hrtimer_bases);
|
||||
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
|
||||
int i;
|
||||
|
||||
hrtimer_get_softirq_time(base);
|
||||
hrtimer_get_softirq_time(cpu_base);
|
||||
|
||||
for (i = 0; i < MAX_HRTIMER_BASES; i++)
|
||||
run_hrtimer_queue(&base[i]);
|
||||
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
|
||||
run_hrtimer_queue(cpu_base, i);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -792,19 +805,21 @@ sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
|
|||
*/
|
||||
static void __devinit init_hrtimers_cpu(int cpu)
|
||||
{
|
||||
struct hrtimer_base *base = per_cpu(hrtimer_bases, cpu);
|
||||
struct hrtimer_cpu_base *cpu_base = &per_cpu(hrtimer_bases, cpu);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < MAX_HRTIMER_BASES; i++, base++) {
|
||||
spin_lock_init(&base->lock);
|
||||
lockdep_set_class(&base->lock, &base->lock_key);
|
||||
}
|
||||
spin_lock_init(&cpu_base->lock);
|
||||
lockdep_set_class(&cpu_base->lock, &cpu_base->lock_key);
|
||||
|
||||
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)
|
||||
cpu_base->clock_base[i].cpu_base = cpu_base;
|
||||
|
||||
}
|
||||
|
||||
#ifdef CONFIG_HOTPLUG_CPU
|
||||
|
||||
static void migrate_hrtimer_list(struct hrtimer_base *old_base,
|
||||
struct hrtimer_base *new_base)
|
||||
static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
|
||||
struct hrtimer_clock_base *new_base)
|
||||
{
|
||||
struct hrtimer *timer;
|
||||
struct rb_node *node;
|
||||
|
|
@ -819,29 +834,26 @@ static void migrate_hrtimer_list(struct hrtimer_base *old_base,
|
|||
|
||||
static void migrate_hrtimers(int cpu)
|
||||
{
|
||||
struct hrtimer_base *old_base, *new_base;
|
||||
struct hrtimer_cpu_base *old_base, *new_base;
|
||||
int i;
|
||||
|
||||
BUG_ON(cpu_online(cpu));
|
||||
old_base = per_cpu(hrtimer_bases, cpu);
|
||||
new_base = get_cpu_var(hrtimer_bases);
|
||||
old_base = &per_cpu(hrtimer_bases, cpu);
|
||||
new_base = &get_cpu_var(hrtimer_bases);
|
||||
|
||||
local_irq_disable();
|
||||
|
||||
for (i = 0; i < MAX_HRTIMER_BASES; i++) {
|
||||
|
||||
spin_lock(&new_base->lock);
|
||||
spin_lock(&old_base->lock);
|
||||
spin_lock(&new_base->lock);
|
||||
spin_lock(&old_base->lock);
|
||||
|
||||
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
|
||||
BUG_ON(old_base->curr_timer);
|
||||
|
||||
migrate_hrtimer_list(old_base, new_base);
|
||||
|
||||
spin_unlock(&old_base->lock);
|
||||
spin_unlock(&new_base->lock);
|
||||
old_base++;
|
||||
new_base++;
|
||||
migrate_hrtimer_list(&old_base->clock_base[i],
|
||||
&new_base->clock_base[i]);
|
||||
}
|
||||
spin_unlock(&old_base->lock);
|
||||
spin_unlock(&new_base->lock);
|
||||
|
||||
local_irq_enable();
|
||||
put_cpu_var(hrtimer_bases);
|
||||
|
|
|
|||
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