/*
* We want the task to sleep while waiting for next job to become
* ready, so we set the timer to the release instant and try to activate it.
*/
void start_timer_rtws(struct rq *rq, struct sched_rtws_entity *rtws_se)
{
ktime_t now, act;
ktime_t soft, hard;
unsigned long range;
s64 delta;
/*
* We want the timer to fire at given release time, but considering
* that it is actually coming from rq->clock and not from
* hrtimer's time base reading.
*/
act = ns_to_ktime(rtws_se->job.release);
now = hrtimer_cb_get_time(&rtws_se->timer);
delta = ktime_to_ns(now) - rq->clock;
act = ktime_add_ns(act, delta);
hrtimer_set_expires(&rtws_se->timer, act);
soft = hrtimer_get_softexpires(&rtws_se->timer);
hard = hrtimer_get_expires(&rtws_se->timer);
printk(KERN_INFO "expire: %Ld, soft: %Ld, hard: %Ld\n", ktime_to_ns(act), ktime_to_ns(soft), ktime_to_ns(hard));
range = ktime_to_ns(ktime_sub(hard, soft));
__hrtimer_start_range_ns(&rtws_se->timer, soft,
range, HRTIMER_MODE_ABS, 0);
}
static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
{
struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
atomic_set(&dpcm->running, 1);
return 0;
}
static enum hrtimer_restart timer_callback( struct hrtimer* p_hrtimer )
{
ktime_t now;
pr_info( "%s\n", __FUNCTION__ );
// we need to modify the next fire jiffies....else beware :-)
now = hrtimer_cb_get_time(p_hrtimer);
hrtimer_forward( p_hrtimer, now, TIMER_INTERVAL_MS*1E6L );
return HRTIMER_RESTART;
}
static enum hrtimer_restart lights_timer_cb(struct hrtimer *timer)
{
gpio_set_value(XMAS_OUT_0, lights_toggle);
lights_toggle = lights_toggle ? 0 : 1;
ktime_t kt_now;
ktime_t kt_period = ktime_set(0, 1000 * (lights_toggle ? 20 : 10));
kt_now = hrtimer_cb_get_time(&lights_timer);
hrtimer_forward(&lights_timer, kt_now, kt_period);
return HRTIMER_RESTART;
}
static snd_pcm_uframes_t
dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
u64 delta;
u32 pos;
delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
dpcm->base_time);
delta = div_u64(delta * runtime->rate + 999999, 1000000);
div_u64_rem(delta, runtime->buffer_size, &pos);
return pos;
}
static enum hrtimer_restart sched_rt_period_timer(struct hrtimer *timer)
{
struct rt_bandwidth *rt_b =
container_of(timer, struct rt_bandwidth, rt_period_timer);
ktime_t now;
int overrun;
int idle = 0;
for (;;) {
now = hrtimer_cb_get_time(timer);
overrun = hrtimer_forward(timer, now, rt_b->rt_period);
if (!overrun)
break;
idle = do_sched_rt_period_timer(rt_b, overrun);
}
return idle ? HRTIMER_NORESTART : HRTIMER_RESTART;
}
static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
{
struct k_itimer *timr;
unsigned long flags;
int si_private = 0;
enum hrtimer_restart ret = HRTIMER_NORESTART;
timr = container_of(timer, struct k_itimer, it.real.timer);
spin_lock_irqsave(&timr->it_lock, flags);
if (timr->it.real.interval.tv64 != 0)
si_private = ++timr->it_requeue_pending;
if (posix_timer_event(timr, si_private)) {
if (timr->it.real.interval.tv64 != 0) {
ktime_t now = hrtimer_cb_get_time(timer);
#ifdef CONFIG_HIGH_RES_TIMERS
{
ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ);
if (timr->it.real.interval.tv64 < kj.tv64)
now = ktime_add(now, kj);
}
#endif
timr->it_overrun += (unsigned int)
hrtimer_forward(timer, now,
timr->it.real.interval);
ret = HRTIMER_RESTART;
++timr->it_requeue_pending;
}
}
unlock_timer(timr, flags);
return ret;
}
/*
* This function gets called when a POSIX.1b interval timer expires. It
* is used as a callback from the kernel internal timer. The
* run_timer_list code ALWAYS calls with interrupts on.
* This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers.
*/
static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
{
struct k_itimer *timr;
unsigned long flags;
int si_private = 0;
enum hrtimer_restart ret = HRTIMER_NORESTART;
timr = container_of(timer, struct k_itimer, it.real.timer);
spin_lock_irqsave(&timr->it_lock, flags);
if (timr->it.real.interval.tv64 != 0)
si_private = ++timr->it_requeue_pending;
if (posix_timer_event(timr, si_private)) {
/*
* signal was not sent because of sig_ignor
* we will not get a call back to restart it AND
* it should be restarted.
*/
if (timr->it.real.interval.tv64 != 0) {
ktime_t now = hrtimer_cb_get_time(timer);
/*
* FIXME: What we really want, is to stop this
* timer completely and restart it in case the
* SIG_IGN is removed. This is a non trivial
* change which involves sighand locking
* (sigh !), which we don't want to do late in
* the release cycle.
*
* For now we just let timers with an interval
* less than a jiffie expire every jiffie to
* avoid softirq starvation in case of SIG_IGN
* and a very small interval, which would put
* the timer right back on the softirq pending
* list. By moving now ahead of time we trick
* hrtimer_forward() to expire the timer
* later, while we still maintain the overrun
* accuracy, but have some inconsistency in
* the timer_gettime() case. This is at least
* better than a starved softirq. A more
* complex fix which solves also another related
* inconsistency is already in the pipeline.
*/
#ifdef CONFIG_HIGH_RES_TIMERS
{
ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ);
if (timr->it.real.interval.tv64 < kj.tv64)
now = ktime_add(now, kj);
}
#endif
timr->it_overrun += (unsigned int)
hrtimer_forward(timer, now,
timr->it.real.interval);
ret = HRTIMER_RESTART;
++timr->it_requeue_pending;
}
}
unlock_timer(timr, flags);
return ret;
}
__BEGIN_PROGRAM
/*
* kernel/sched/core.c
*
* Kernel scheduler and related syscalls
*
* Copyright (C) 1991-2002 Linus Torvalds
*
* 1996-12-23 Modified by Dave Grothe to fix bugs in semaphores and
* make semaphores SMP safe
* 1998-11-19 Implemented schedule_timeout() and related stuff
* by Andrea Arcangeli
* 2002-01-04 New ultra-scalable O(1) scheduler by Ingo Molnar:
* hybrid priority-list and round-robin design with
* an array-switch method of distributing timeslices
* and per-CPU runqueues. Cleanups and useful suggestions
* by Davide Libenzi, preemptible kernel bits by Robert Love.
* 2003-09-03 Interactivity tuning by Con Kolivas.
* 2004-04-02 Scheduler domains code by Nick Piggin
* 2007-04-15 Work begun on replacing all interactivity tuning with a
* fair scheduling design by Con Kolivas.
* 2007-05-05 Load balancing (smp-nice) and other improvements
* by Peter Williams
* 2007-05-06 Interactivity improvements to CFS by Mike Galbraith
* 2007-07-01 Group scheduling enhancements by Srivatsa Vaddagiri
* 2007-11-29 RT balancing improvements by Steven Rostedt, Gregory Haskins,
* Thomas Gleixner, Mike Kravetz
*/
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/nmi.h>
#include <linux/init.h>
#include <linux/uaccess.h>
#include <linux/highmem.h>
#include <asm/mmu_context.h>
#include <linux/interrupt.h>
#include <linux/capability.h>
#include <linux/completion.h>
#include <linux/kernel_stat.h>
#include <linux/debug_locks.h>
#include <linux/perf_event.h>
#include <linux/security.h>
#include <linux/notifier.h>
#include <linux/profile.h>
#include <linux/freezer.h>
#include <linux/vmalloc.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/pid_namespace.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/timer.h>
#include <linux/rcupdate.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/percpu.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sysctl.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/tsacct_kern.h>
#include <linux/kprobes.h>
#include <linux/delayacct.h>
#include <linux/unistd.h>
#include <linux/pagemap.h>
#include <linux/hrtimer.h>
#include <linux/tick.h>
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
#include <linux/slab.h>
#include <linux/init_task.h>
#include <linux/binfmts.h>
#include <asm/switch_to.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
#include <asm/mutex.h>
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#endif
#include "sched.h"
#include "../workqueue_sched.h"
#include "../smpboot.h"
#define CREATE_TRACE_POINTS
#include <trace/events/sched.h>
void start_bandwidth_timer(struct hrtimer period_timer , int period)
{
unsigned long delta;
int soft, hard, now;
for (;;) {
if (hrtimer_active(period_timer))
break;
now = hrtimer_cb_get_time(period_timer);
hrtimer_forward(period_timer, now, period);
soft = hrtimer_get_softexpires(period_timer);
hard = hrtimer_get_expires(period_timer);
delta = into_ns(ktime_sub(hard, soft));
hrtimer_start_range_ns(period_timer, soft, delta,
HRTIMER_MODE_ABS_PINNED, 0);
}
}