dahdi: Group dahdi timers into "rates" for improved CPU utilization.
Most of the timers added to the kernel will be configured to fire at the same rate. This allows one "wake_up" from interrupt context to wake up all the waiters. On one test system, I saw about a ~10% improvement in CPU utilization when 10,000 timers were opened. Signed-off-by: Shaun Ruffell <sruffell@digium.com> Acked-by: Michael Spiceland <mspiceland@digium.com> Acked-by: Kinsey Moore <kmoore@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9891 a0bf4364-ded3-4de4-8d8a-66a801d63aff
This commit is contained in:
Shaun Ruffell
parent
1a6bbe43e7
commit
3ae1b03082
@ -289,18 +289,44 @@ static inline void dahdi_kernel_fpu_end(void)
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#endif
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struct dahdi_timer {
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int ms; /* Countdown */
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int pos; /* Position */
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int ping; /* Whether we've been ping'd */
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int tripped; /* Whether we're tripped */
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struct list_head list;
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/**
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* struct dahdi_timer_rate - A collection of timers of a given rate.
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* @rate_samples: Samples until these timers fire.
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* @cur_samples: Samples processed since last firing.
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* @sel: Wait queue for timer waiters.
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* @timers: List of individual timers at this rate.
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* @node: For storing on dahdi_timer_rates list.
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*
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*/
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struct dahdi_timer_rate {
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int rate_samples;
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int cur_samples;
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wait_queue_head_t sel;
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struct list_head timers;
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struct list_head node;
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};
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static LIST_HEAD(dahdi_timers);
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/**
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* struct dahdi_timer - A dahdi timer opened from user space.
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* @ping: 1 if we should operate in "continuous mode".
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* @tripped: Count of times we've tripped.
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* @rate: The rate this timer fires at.
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* @node: To store on rate->timers list.
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*
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* When a timer is in "continuous" mode, it should always return immediately
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* from a poll call from user space.
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*
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*/
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struct dahdi_timer {
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atomic_t ping;
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atomic_t tripped;
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struct dahdi_timer_rate *rate;
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struct list_head node;
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};
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static LIST_HEAD(dahdi_timer_rates);
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static DEFINE_SPINLOCK(dahdi_timer_lock);
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static DEFINE_MUTEX(dahdi_timer_mutex);
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#define DEFAULT_TONE_ZONE (-1)
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@ -2730,48 +2756,47 @@ static int initialize_channel(struct dahdi_chan *chan)
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static int dahdi_timing_open(struct file *file)
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{
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struct dahdi_timer *t;
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unsigned long flags;
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if (!(t = kzalloc(sizeof(*t), GFP_KERNEL)))
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t = kzalloc(sizeof(*t), GFP_KERNEL);
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if (!t)
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return -ENOMEM;
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init_waitqueue_head(&t->sel);
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INIT_LIST_HEAD(&t->list);
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INIT_LIST_HEAD(&t->node);
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file->private_data = t;
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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list_add(&t->list, &dahdi_timers);
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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return 0;
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}
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static int dahdi_timer_release(struct file *file)
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/**
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* _dahdi_remove_timer - Removes the timer from the rate it's associated with.
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*
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* Must be called with dahdi_timer_mutex held.
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*/
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static void _dahdi_remove_timer(struct dahdi_timer *timer)
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{
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struct dahdi_timer *t, *cur, *next;
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unsigned long flags;
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if (!(t = file->private_data))
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return 0;
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struct dahdi_timer_rate *const rate = timer->rate;
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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list_for_each_entry_safe(cur, next, &dahdi_timers, list) {
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if (t == cur) {
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list_del(&cur->list);
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break;
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}
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list_del(&timer->node);
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if (rate && list_empty(&rate->timers)) {
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list_del(&rate->node);
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kfree(rate);
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}
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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timer->rate = NULL;
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}
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if (!cur) {
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module_printk(KERN_NOTICE, "Timer: Not on list??\n");
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static int dahdi_timer_release(struct file *file)
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{
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struct dahdi_timer *timer = file->private_data;
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if (!timer)
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return 0;
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}
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kfree(cur);
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mutex_lock(&dahdi_timer_mutex);
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_dahdi_remove_timer(timer);
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mutex_unlock(&dahdi_timer_mutex);
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file->private_data = NULL;
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return 0;
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}
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@ -3658,48 +3683,80 @@ void dahdi_alarm_notify(struct dahdi_span *span)
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}
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}
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static int dahdi_timer_ioctl(struct file *file, unsigned int cmd, unsigned long data, struct dahdi_timer *timer)
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static int
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dahdi_timer_ioctl(struct file *file, unsigned int cmd,
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unsigned long data, struct dahdi_timer *timer)
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{
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int j;
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struct dahdi_timer_rate *rate, *c_rate;
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unsigned long flags;
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switch(cmd) {
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case DAHDI_TIMERCONFIG:
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get_user(j, (int __user *)data);
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if (j < 0)
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j = 0;
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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timer->ms = timer->pos = j;
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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mutex_lock(&dahdi_timer_mutex);
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if (timer->rate)
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_dahdi_remove_timer(timer);
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rate = NULL;
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list_for_each_entry(c_rate, &dahdi_timer_rates, node) {
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if (c_rate->rate_samples == j) {
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rate = c_rate;
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break;
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}
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}
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if (!rate) {
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/* If we didn't find a rate, we need to create a new
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* one */
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rate = kzalloc(sizeof(*rate), GFP_KERNEL);
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if (!rate) {
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mutex_unlock(&dahdi_timer_mutex);
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return -ENOMEM;
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}
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init_waitqueue_head(&rate->sel);
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rate->rate_samples = rate->cur_samples = j;
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INIT_LIST_HEAD(&rate->timers);
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timer->rate = rate;
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list_add_tail(&timer->node, &rate->timers);
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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list_add_tail(&rate->node, &dahdi_timer_rates);
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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} else {
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/* Otherwise, just add this new timer to the existing
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* rates. */
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timer->rate = rate;
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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list_add_tail(&timer->node, &rate->timers);
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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}
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mutex_unlock(&dahdi_timer_mutex);
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break;
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case DAHDI_TIMERACK:
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get_user(j, (int __user *)data);
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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if ((j < 1) || (j > timer->tripped))
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j = timer->tripped;
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timer->tripped -= j;
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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if ((j < 1) || (j > atomic_read(&timer->tripped)))
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j = atomic_read(&timer->tripped);
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atomic_sub(j, &timer->tripped);
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break;
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case DAHDI_GETEVENT: /* Get event on queue */
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j = DAHDI_EVENT_NONE;
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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/* set up for no event */
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if (timer->tripped)
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if (atomic_read(&timer->tripped))
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j = DAHDI_EVENT_TIMER_EXPIRED;
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if (timer->ping)
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if (atomic_read(&timer->ping))
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j = DAHDI_EVENT_TIMER_PING;
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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put_user(j, (int __user *)data);
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break;
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case DAHDI_TIMERPING:
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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timer->ping = 1;
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wake_up_interruptible(&timer->sel);
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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atomic_set(&timer->ping, 1);
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if (timer->rate)
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wake_up_interruptible(&timer->rate->sel);
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break;
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case DAHDI_TIMERPONG:
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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timer->ping = 0;
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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atomic_set(&timer->ping, 0);
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break;
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default:
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return -ENOTTY;
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@ -8493,21 +8550,26 @@ int dahdi_hdlc_getbuf(struct dahdi_chan *ss, unsigned char *bufptr, unsigned int
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static void process_timers(void)
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{
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struct dahdi_timer *cur;
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struct dahdi_timer_rate *cur_rate;
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struct dahdi_timer *cur_timer;
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if (list_empty(&dahdi_timers))
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if (list_empty(&dahdi_timer_rates))
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return;
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spin_lock(&dahdi_timer_lock);
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list_for_each_entry(cur, &dahdi_timers, list) {
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if (cur->ms) {
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cur->pos -= DAHDI_CHUNKSIZE;
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if (cur->pos <= 0) {
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cur->tripped++;
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cur->pos = cur->ms;
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wake_up_interruptible(&cur->sel);
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}
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}
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list_for_each_entry(cur_rate, &dahdi_timer_rates, node) {
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if (!cur_rate->rate_samples)
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continue;
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cur_rate->cur_samples -= DAHDI_CHUNKSIZE;
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if (cur_rate->cur_samples > 0)
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continue;
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list_for_each_entry(cur_timer, &cur_rate->timers, node)
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atomic_inc(&cur_timer->tripped);
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cur_rate->cur_samples = cur_rate->rate_samples;
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wake_up_interruptible(&cur_rate->sel);
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}
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spin_unlock(&dahdi_timer_lock);
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}
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@ -8515,17 +8577,16 @@ static void process_timers(void)
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static unsigned int dahdi_timer_poll(struct file *file, struct poll_table_struct *wait_table)
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{
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struct dahdi_timer *timer = file->private_data;
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unsigned long flags;
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int ret = 0;
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if (timer) {
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poll_wait(file, &timer->sel, wait_table);
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spin_lock_irqsave(&dahdi_timer_lock, flags);
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if (timer->tripped || timer->ping)
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ret |= POLLPRI;
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spin_unlock_irqrestore(&dahdi_timer_lock, flags);
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} else
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ret = -EINVAL;
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return ret;
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struct dahdi_timer_rate *rate = timer->rate;
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if (!rate || !timer)
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return -EINVAL;
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poll_wait(file, &rate->sel, wait_table);
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if (atomic_read(&timer->tripped) || atomic_read(&timer->ping))
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return POLLPRI;
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return 0;
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}
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/* device poll routine */
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