Merge branch 'sched/clock' into sched/urgent
This commit is contained in:
commit
e26b33e955
|
@ -1551,16 +1551,10 @@ static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
|
||||||
|
|
||||||
extern unsigned long long sched_clock(void);
|
extern unsigned long long sched_clock(void);
|
||||||
|
|
||||||
|
extern void sched_clock_init(void);
|
||||||
|
extern u64 sched_clock_cpu(int cpu);
|
||||||
|
|
||||||
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
|
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
|
||||||
static inline void sched_clock_init(void)
|
|
||||||
{
|
|
||||||
}
|
|
||||||
|
|
||||||
static inline u64 sched_clock_cpu(int cpu)
|
|
||||||
{
|
|
||||||
return sched_clock();
|
|
||||||
}
|
|
||||||
|
|
||||||
static inline void sched_clock_tick(void)
|
static inline void sched_clock_tick(void)
|
||||||
{
|
{
|
||||||
}
|
}
|
||||||
|
@ -1572,28 +1566,11 @@ static inline void sched_clock_idle_sleep_event(void)
|
||||||
static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
|
static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
|
||||||
{
|
{
|
||||||
}
|
}
|
||||||
|
#else
|
||||||
#ifdef CONFIG_NO_HZ
|
|
||||||
static inline void sched_clock_tick_stop(int cpu)
|
|
||||||
{
|
|
||||||
}
|
|
||||||
|
|
||||||
static inline void sched_clock_tick_start(int cpu)
|
|
||||||
{
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
|
|
||||||
#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
|
|
||||||
extern void sched_clock_init(void);
|
|
||||||
extern u64 sched_clock_cpu(int cpu);
|
|
||||||
extern void sched_clock_tick(void);
|
extern void sched_clock_tick(void);
|
||||||
extern void sched_clock_idle_sleep_event(void);
|
extern void sched_clock_idle_sleep_event(void);
|
||||||
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
|
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
|
||||||
#ifdef CONFIG_NO_HZ
|
|
||||||
extern void sched_clock_tick_stop(int cpu);
|
|
||||||
extern void sched_clock_tick_start(int cpu);
|
|
||||||
#endif
|
#endif
|
||||||
#endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* For kernel-internal use: high-speed (but slightly incorrect) per-cpu
|
* For kernel-internal use: high-speed (but slightly incorrect) per-cpu
|
||||||
|
|
|
@ -42,12 +42,9 @@ unsigned long long __attribute__((weak)) sched_clock(void)
|
||||||
return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
|
return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
|
||||||
}
|
}
|
||||||
|
|
||||||
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
|
static __read_mostly int sched_clock_running;
|
||||||
|
|
||||||
#define MULTI_SHIFT 15
|
#ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
|
||||||
/* Max is double, Min is 1/2 */
|
|
||||||
#define MAX_MULTI (2LL << MULTI_SHIFT)
|
|
||||||
#define MIN_MULTI (1LL << (MULTI_SHIFT-1))
|
|
||||||
|
|
||||||
struct sched_clock_data {
|
struct sched_clock_data {
|
||||||
/*
|
/*
|
||||||
|
@ -58,14 +55,9 @@ struct sched_clock_data {
|
||||||
raw_spinlock_t lock;
|
raw_spinlock_t lock;
|
||||||
|
|
||||||
unsigned long tick_jiffies;
|
unsigned long tick_jiffies;
|
||||||
u64 prev_raw;
|
|
||||||
u64 tick_raw;
|
u64 tick_raw;
|
||||||
u64 tick_gtod;
|
u64 tick_gtod;
|
||||||
u64 clock;
|
u64 clock;
|
||||||
s64 multi;
|
|
||||||
#ifdef CONFIG_NO_HZ
|
|
||||||
int check_max;
|
|
||||||
#endif
|
|
||||||
};
|
};
|
||||||
|
|
||||||
static DEFINE_PER_CPU_SHARED_ALIGNED(struct sched_clock_data, sched_clock_data);
|
static DEFINE_PER_CPU_SHARED_ALIGNED(struct sched_clock_data, sched_clock_data);
|
||||||
|
@ -80,8 +72,6 @@ static inline struct sched_clock_data *cpu_sdc(int cpu)
|
||||||
return &per_cpu(sched_clock_data, cpu);
|
return &per_cpu(sched_clock_data, cpu);
|
||||||
}
|
}
|
||||||
|
|
||||||
static __read_mostly int sched_clock_running;
|
|
||||||
|
|
||||||
void sched_clock_init(void)
|
void sched_clock_init(void)
|
||||||
{
|
{
|
||||||
u64 ktime_now = ktime_to_ns(ktime_get());
|
u64 ktime_now = ktime_to_ns(ktime_get());
|
||||||
|
@ -93,90 +83,39 @@ void sched_clock_init(void)
|
||||||
|
|
||||||
scd->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
|
scd->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
|
||||||
scd->tick_jiffies = now_jiffies;
|
scd->tick_jiffies = now_jiffies;
|
||||||
scd->prev_raw = 0;
|
|
||||||
scd->tick_raw = 0;
|
scd->tick_raw = 0;
|
||||||
scd->tick_gtod = ktime_now;
|
scd->tick_gtod = ktime_now;
|
||||||
scd->clock = ktime_now;
|
scd->clock = ktime_now;
|
||||||
scd->multi = 1 << MULTI_SHIFT;
|
|
||||||
#ifdef CONFIG_NO_HZ
|
|
||||||
scd->check_max = 1;
|
|
||||||
#endif
|
|
||||||
}
|
}
|
||||||
|
|
||||||
sched_clock_running = 1;
|
sched_clock_running = 1;
|
||||||
}
|
}
|
||||||
|
|
||||||
#ifdef CONFIG_NO_HZ
|
|
||||||
/*
|
|
||||||
* The dynamic ticks makes the delta jiffies inaccurate. This
|
|
||||||
* prevents us from checking the maximum time update.
|
|
||||||
* Disable the maximum check during stopped ticks.
|
|
||||||
*/
|
|
||||||
void sched_clock_tick_stop(int cpu)
|
|
||||||
{
|
|
||||||
struct sched_clock_data *scd = cpu_sdc(cpu);
|
|
||||||
|
|
||||||
scd->check_max = 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
void sched_clock_tick_start(int cpu)
|
|
||||||
{
|
|
||||||
struct sched_clock_data *scd = cpu_sdc(cpu);
|
|
||||||
|
|
||||||
scd->check_max = 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int check_max(struct sched_clock_data *scd)
|
|
||||||
{
|
|
||||||
return scd->check_max;
|
|
||||||
}
|
|
||||||
#else
|
|
||||||
static int check_max(struct sched_clock_data *scd)
|
|
||||||
{
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
#endif /* CONFIG_NO_HZ */
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* update the percpu scd from the raw @now value
|
* update the percpu scd from the raw @now value
|
||||||
*
|
*
|
||||||
* - filter out backward motion
|
* - filter out backward motion
|
||||||
* - use jiffies to generate a min,max window to clip the raw values
|
* - use jiffies to generate a min,max window to clip the raw values
|
||||||
*/
|
*/
|
||||||
static void __update_sched_clock(struct sched_clock_data *scd, u64 now, u64 *time)
|
static u64 __update_sched_clock(struct sched_clock_data *scd, u64 now)
|
||||||
{
|
{
|
||||||
unsigned long now_jiffies = jiffies;
|
unsigned long now_jiffies = jiffies;
|
||||||
long delta_jiffies = now_jiffies - scd->tick_jiffies;
|
long delta_jiffies = now_jiffies - scd->tick_jiffies;
|
||||||
u64 clock = scd->clock;
|
u64 clock = scd->clock;
|
||||||
u64 min_clock, max_clock;
|
u64 min_clock, max_clock;
|
||||||
s64 delta = now - scd->prev_raw;
|
s64 delta = now - scd->tick_raw;
|
||||||
|
|
||||||
WARN_ON_ONCE(!irqs_disabled());
|
WARN_ON_ONCE(!irqs_disabled());
|
||||||
|
min_clock = scd->tick_gtod + delta_jiffies * TICK_NSEC;
|
||||||
/*
|
|
||||||
* At schedule tick the clock can be just under the gtod. We don't
|
|
||||||
* want to push it too prematurely.
|
|
||||||
*/
|
|
||||||
min_clock = scd->tick_gtod + (delta_jiffies * TICK_NSEC);
|
|
||||||
if (min_clock > TICK_NSEC)
|
|
||||||
min_clock -= TICK_NSEC / 2;
|
|
||||||
|
|
||||||
if (unlikely(delta < 0)) {
|
if (unlikely(delta < 0)) {
|
||||||
clock++;
|
clock++;
|
||||||
goto out;
|
goto out;
|
||||||
}
|
}
|
||||||
|
|
||||||
/*
|
max_clock = min_clock + TICK_NSEC;
|
||||||
* The clock must stay within a jiffie of the gtod.
|
|
||||||
* But since we may be at the start of a jiffy or the end of one
|
|
||||||
* we add another jiffy buffer.
|
|
||||||
*/
|
|
||||||
max_clock = scd->tick_gtod + (2 + delta_jiffies) * TICK_NSEC;
|
|
||||||
|
|
||||||
delta *= scd->multi;
|
if (unlikely(clock + delta > max_clock)) {
|
||||||
delta >>= MULTI_SHIFT;
|
|
||||||
|
|
||||||
if (unlikely(clock + delta > max_clock) && check_max(scd)) {
|
|
||||||
if (clock < max_clock)
|
if (clock < max_clock)
|
||||||
clock = max_clock;
|
clock = max_clock;
|
||||||
else
|
else
|
||||||
|
@ -189,12 +128,10 @@ static void __update_sched_clock(struct sched_clock_data *scd, u64 now, u64 *tim
|
||||||
if (unlikely(clock < min_clock))
|
if (unlikely(clock < min_clock))
|
||||||
clock = min_clock;
|
clock = min_clock;
|
||||||
|
|
||||||
if (time)
|
scd->tick_jiffies = now_jiffies;
|
||||||
*time = clock;
|
scd->clock = clock;
|
||||||
else {
|
|
||||||
scd->prev_raw = now;
|
return clock;
|
||||||
scd->clock = clock;
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
|
|
||||||
static void lock_double_clock(struct sched_clock_data *data1,
|
static void lock_double_clock(struct sched_clock_data *data1,
|
||||||
|
@ -212,7 +149,7 @@ static void lock_double_clock(struct sched_clock_data *data1,
|
||||||
u64 sched_clock_cpu(int cpu)
|
u64 sched_clock_cpu(int cpu)
|
||||||
{
|
{
|
||||||
struct sched_clock_data *scd = cpu_sdc(cpu);
|
struct sched_clock_data *scd = cpu_sdc(cpu);
|
||||||
u64 now, clock;
|
u64 now, clock, this_clock, remote_clock;
|
||||||
|
|
||||||
if (unlikely(!sched_clock_running))
|
if (unlikely(!sched_clock_running))
|
||||||
return 0ull;
|
return 0ull;
|
||||||
|
@ -221,43 +158,44 @@ u64 sched_clock_cpu(int cpu)
|
||||||
now = sched_clock();
|
now = sched_clock();
|
||||||
|
|
||||||
if (cpu != raw_smp_processor_id()) {
|
if (cpu != raw_smp_processor_id()) {
|
||||||
/*
|
|
||||||
* in order to update a remote cpu's clock based on our
|
|
||||||
* unstable raw time rebase it against:
|
|
||||||
* tick_raw (offset between raw counters)
|
|
||||||
* tick_gotd (tick offset between cpus)
|
|
||||||
*/
|
|
||||||
struct sched_clock_data *my_scd = this_scd();
|
struct sched_clock_data *my_scd = this_scd();
|
||||||
|
|
||||||
lock_double_clock(scd, my_scd);
|
lock_double_clock(scd, my_scd);
|
||||||
|
|
||||||
now -= my_scd->tick_raw;
|
this_clock = __update_sched_clock(my_scd, now);
|
||||||
now += scd->tick_raw;
|
remote_clock = scd->clock;
|
||||||
|
|
||||||
now += my_scd->tick_gtod;
|
/*
|
||||||
now -= scd->tick_gtod;
|
* Use the opportunity that we have both locks
|
||||||
|
* taken to couple the two clocks: we take the
|
||||||
|
* larger time as the latest time for both
|
||||||
|
* runqueues. (this creates monotonic movement)
|
||||||
|
*/
|
||||||
|
if (likely(remote_clock < this_clock)) {
|
||||||
|
clock = this_clock;
|
||||||
|
scd->clock = clock;
|
||||||
|
} else {
|
||||||
|
/*
|
||||||
|
* Should be rare, but possible:
|
||||||
|
*/
|
||||||
|
clock = remote_clock;
|
||||||
|
my_scd->clock = remote_clock;
|
||||||
|
}
|
||||||
|
|
||||||
__raw_spin_unlock(&my_scd->lock);
|
__raw_spin_unlock(&my_scd->lock);
|
||||||
|
|
||||||
__update_sched_clock(scd, now, &clock);
|
|
||||||
|
|
||||||
__raw_spin_unlock(&scd->lock);
|
|
||||||
|
|
||||||
} else {
|
} else {
|
||||||
__raw_spin_lock(&scd->lock);
|
__raw_spin_lock(&scd->lock);
|
||||||
__update_sched_clock(scd, now, NULL);
|
clock = __update_sched_clock(scd, now);
|
||||||
clock = scd->clock;
|
|
||||||
__raw_spin_unlock(&scd->lock);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
__raw_spin_unlock(&scd->lock);
|
||||||
|
|
||||||
return clock;
|
return clock;
|
||||||
}
|
}
|
||||||
|
|
||||||
void sched_clock_tick(void)
|
void sched_clock_tick(void)
|
||||||
{
|
{
|
||||||
struct sched_clock_data *scd = this_scd();
|
struct sched_clock_data *scd = this_scd();
|
||||||
unsigned long now_jiffies = jiffies;
|
|
||||||
s64 mult, delta_gtod, delta_raw;
|
|
||||||
u64 now, now_gtod;
|
u64 now, now_gtod;
|
||||||
|
|
||||||
if (unlikely(!sched_clock_running))
|
if (unlikely(!sched_clock_running))
|
||||||
|
@ -269,29 +207,14 @@ void sched_clock_tick(void)
|
||||||
now = sched_clock();
|
now = sched_clock();
|
||||||
|
|
||||||
__raw_spin_lock(&scd->lock);
|
__raw_spin_lock(&scd->lock);
|
||||||
__update_sched_clock(scd, now, NULL);
|
__update_sched_clock(scd, now);
|
||||||
/*
|
/*
|
||||||
* update tick_gtod after __update_sched_clock() because that will
|
* update tick_gtod after __update_sched_clock() because that will
|
||||||
* already observe 1 new jiffy; adding a new tick_gtod to that would
|
* already observe 1 new jiffy; adding a new tick_gtod to that would
|
||||||
* increase the clock 2 jiffies.
|
* increase the clock 2 jiffies.
|
||||||
*/
|
*/
|
||||||
delta_gtod = now_gtod - scd->tick_gtod;
|
|
||||||
delta_raw = now - scd->tick_raw;
|
|
||||||
|
|
||||||
if ((long)delta_raw > 0) {
|
|
||||||
mult = delta_gtod << MULTI_SHIFT;
|
|
||||||
do_div(mult, delta_raw);
|
|
||||||
scd->multi = mult;
|
|
||||||
if (scd->multi > MAX_MULTI)
|
|
||||||
scd->multi = MAX_MULTI;
|
|
||||||
else if (scd->multi < MIN_MULTI)
|
|
||||||
scd->multi = MIN_MULTI;
|
|
||||||
} else
|
|
||||||
scd->multi = 1 << MULTI_SHIFT;
|
|
||||||
|
|
||||||
scd->tick_raw = now;
|
scd->tick_raw = now;
|
||||||
scd->tick_gtod = now_gtod;
|
scd->tick_gtod = now_gtod;
|
||||||
scd->tick_jiffies = now_jiffies;
|
|
||||||
__raw_spin_unlock(&scd->lock);
|
__raw_spin_unlock(&scd->lock);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -310,7 +233,6 @@ EXPORT_SYMBOL_GPL(sched_clock_idle_sleep_event);
|
||||||
void sched_clock_idle_wakeup_event(u64 delta_ns)
|
void sched_clock_idle_wakeup_event(u64 delta_ns)
|
||||||
{
|
{
|
||||||
struct sched_clock_data *scd = this_scd();
|
struct sched_clock_data *scd = this_scd();
|
||||||
u64 now = sched_clock();
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Override the previous timestamp and ignore all
|
* Override the previous timestamp and ignore all
|
||||||
|
@ -319,15 +241,28 @@ void sched_clock_idle_wakeup_event(u64 delta_ns)
|
||||||
* rq clock:
|
* rq clock:
|
||||||
*/
|
*/
|
||||||
__raw_spin_lock(&scd->lock);
|
__raw_spin_lock(&scd->lock);
|
||||||
scd->prev_raw = now;
|
|
||||||
scd->clock += delta_ns;
|
scd->clock += delta_ns;
|
||||||
scd->multi = 1 << MULTI_SHIFT;
|
|
||||||
__raw_spin_unlock(&scd->lock);
|
__raw_spin_unlock(&scd->lock);
|
||||||
|
|
||||||
touch_softlockup_watchdog();
|
touch_softlockup_watchdog();
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
|
EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
|
||||||
|
|
||||||
|
#else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
|
||||||
|
|
||||||
|
void sched_clock_init(void)
|
||||||
|
{
|
||||||
|
sched_clock_running = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
u64 sched_clock_cpu(int cpu)
|
||||||
|
{
|
||||||
|
if (unlikely(!sched_clock_running))
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
return sched_clock();
|
||||||
|
}
|
||||||
|
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
unsigned long long cpu_clock(int cpu)
|
unsigned long long cpu_clock(int cpu)
|
||||||
|
|
|
@ -289,7 +289,6 @@ void tick_nohz_stop_sched_tick(int inidle)
|
||||||
ts->tick_stopped = 1;
|
ts->tick_stopped = 1;
|
||||||
ts->idle_jiffies = last_jiffies;
|
ts->idle_jiffies = last_jiffies;
|
||||||
rcu_enter_nohz();
|
rcu_enter_nohz();
|
||||||
sched_clock_tick_stop(cpu);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
@ -392,7 +391,6 @@ void tick_nohz_restart_sched_tick(void)
|
||||||
select_nohz_load_balancer(0);
|
select_nohz_load_balancer(0);
|
||||||
now = ktime_get();
|
now = ktime_get();
|
||||||
tick_do_update_jiffies64(now);
|
tick_do_update_jiffies64(now);
|
||||||
sched_clock_tick_start(cpu);
|
|
||||||
cpu_clear(cpu, nohz_cpu_mask);
|
cpu_clear(cpu, nohz_cpu_mask);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
|
Loading…
Reference in New Issue