#include <linux/irq_work.h>
#include <linux/posix-timers.h>
#include <linux/perf_event.h>
+#include <linux/context_tracking.h>
#include <asm/irq_regs.h>
tick_next_period = ktime_add(last_jiffies_update, tick_period);
}
write_sequnlock(&jiffies_lock);
+ update_wall_time();
}
/*
}
#ifdef CONFIG_NO_HZ_FULL
-static cpumask_var_t nohz_full_mask;
-bool have_nohz_full_mask;
+cpumask_var_t tick_nohz_full_mask;
+bool tick_nohz_full_running;
static bool can_stop_full_tick(void)
{
* Don't allow the user to think they can get
* full NO_HZ with this machine.
*/
- WARN_ONCE(have_nohz_full_mask,
+ WARN_ONCE(tick_nohz_full_running,
"NO_HZ FULL will not work with unstable sched clock");
return false;
}
* Re-evaluate the need for the tick on the current CPU
* and restart it if necessary.
*/
-void tick_nohz_full_check(void)
+void __tick_nohz_full_check(void)
{
struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
static void nohz_full_kick_work_func(struct irq_work *work)
{
- tick_nohz_full_check();
+ __tick_nohz_full_check();
}
static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
static void nohz_full_kick_ipi(void *info)
{
- tick_nohz_full_check();
+ __tick_nohz_full_check();
}
/*
*/
void tick_nohz_full_kick_all(void)
{
- if (!have_nohz_full_mask)
+ if (!tick_nohz_full_running)
return;
preempt_disable();
- smp_call_function_many(nohz_full_mask,
+ smp_call_function_many(tick_nohz_full_mask,
nohz_full_kick_ipi, NULL, false);
+ tick_nohz_full_kick();
preempt_enable();
}
* It might need the tick due to per task/process properties:
* perf events, posix cpu timers, ...
*/
-void tick_nohz_task_switch(struct task_struct *tsk)
+void __tick_nohz_task_switch(struct task_struct *tsk)
{
unsigned long flags;
local_irq_restore(flags);
}
-int tick_nohz_full_cpu(int cpu)
-{
- if (!have_nohz_full_mask)
- return 0;
-
- return cpumask_test_cpu(cpu, nohz_full_mask);
-}
-
/* Parse the boot-time nohz CPU list from the kernel parameters. */
static int __init tick_nohz_full_setup(char *str)
{
int cpu;
- alloc_bootmem_cpumask_var(&nohz_full_mask);
- if (cpulist_parse(str, nohz_full_mask) < 0) {
+ alloc_bootmem_cpumask_var(&tick_nohz_full_mask);
+ if (cpulist_parse(str, tick_nohz_full_mask) < 0) {
pr_warning("NOHZ: Incorrect nohz_full cpumask\n");
return 1;
}
cpu = smp_processor_id();
- if (cpumask_test_cpu(cpu, nohz_full_mask)) {
+ if (cpumask_test_cpu(cpu, tick_nohz_full_mask)) {
pr_warning("NO_HZ: Clearing %d from nohz_full range for timekeeping\n", cpu);
- cpumask_clear_cpu(cpu, nohz_full_mask);
+ cpumask_clear_cpu(cpu, tick_nohz_full_mask);
}
- have_nohz_full_mask = true;
+ tick_nohz_full_running = true;
return 1;
}
* If we handle the timekeeping duty for full dynticks CPUs,
* we can't safely shutdown that CPU.
*/
- if (have_nohz_full_mask && tick_do_timer_cpu == cpu)
+ if (tick_nohz_full_running && tick_do_timer_cpu == cpu)
return NOTIFY_BAD;
break;
}
int err = -1;
#ifdef CONFIG_NO_HZ_FULL_ALL
- if (!alloc_cpumask_var(&nohz_full_mask, GFP_KERNEL)) {
+ if (!alloc_cpumask_var(&tick_nohz_full_mask, GFP_KERNEL)) {
pr_err("NO_HZ: Can't allocate full dynticks cpumask\n");
return err;
}
err = 0;
- cpumask_setall(nohz_full_mask);
- cpumask_clear_cpu(smp_processor_id(), nohz_full_mask);
- have_nohz_full_mask = true;
+ cpumask_setall(tick_nohz_full_mask);
+ cpumask_clear_cpu(smp_processor_id(), tick_nohz_full_mask);
+ tick_nohz_full_running = true;
#endif
return err;
}
void __init tick_nohz_init(void)
{
- if (!have_nohz_full_mask) {
+ int cpu;
+
+ if (!tick_nohz_full_running) {
if (tick_nohz_init_all() < 0)
return;
}
+ for_each_cpu(cpu, tick_nohz_full_mask)
+ context_tracking_cpu_set(cpu);
+
cpu_notifier(tick_nohz_cpu_down_callback, 0);
- cpulist_scnprintf(nohz_full_buf, sizeof(nohz_full_buf), nohz_full_mask);
+ cpulist_scnprintf(nohz_full_buf, sizeof(nohz_full_buf), tick_nohz_full_mask);
pr_info("NO_HZ: Full dynticks CPUs: %s.\n", nohz_full_buf);
}
-#else
-#define have_nohz_full_mask (0)
#endif
/*
*/
static void tick_nohz_update_jiffies(ktime_t now)
{
- int cpu = smp_processor_id();
- struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
unsigned long flags;
- ts->idle_waketime = now;
+ __this_cpu_write(tick_cpu_sched.idle_waketime, now);
local_irq_save(flags);
tick_do_update_jiffies64(now);
}
-static void tick_nohz_stop_idle(int cpu, ktime_t now)
+static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)
{
- struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
-
- update_ts_time_stats(cpu, ts, now, NULL);
+ update_ts_time_stats(smp_processor_id(), ts, now, NULL);
ts->idle_active = 0;
sched_clock_idle_wakeup_event(0);
}
-static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
+static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
{
ktime_t now = ktime_get();
return false;
}
- if (have_nohz_full_mask) {
+ if (tick_nohz_full_enabled()) {
/*
* Keep the tick alive to guarantee timekeeping progression
* if there are full dynticks CPUs around
ktime_t now, expires;
int cpu = smp_processor_id();
- now = tick_nohz_start_idle(cpu, ts);
+ now = tick_nohz_start_idle(ts);
if (can_stop_idle_tick(cpu, ts)) {
int was_stopped = ts->tick_stopped;
*/
void tick_nohz_idle_exit(void)
{
- int cpu = smp_processor_id();
- struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+ struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
ktime_t now;
local_irq_disable();
now = ktime_get();
if (ts->idle_active)
- tick_nohz_stop_idle(cpu, now);
+ tick_nohz_stop_idle(ts, now);
if (ts->tick_stopped) {
tick_nohz_restart_sched_tick(ts, now);
* timer and do not touch the other magic bits which need to be done
* when idle is left.
*/
-static void tick_nohz_kick_tick(int cpu, ktime_t now)
+static void tick_nohz_kick_tick(struct tick_sched *ts, ktime_t now)
{
#if 0
/* Switch back to 2.6.27 behaviour */
-
- struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
ktime_t delta;
/*
#endif
}
-static inline void tick_check_nohz(int cpu)
+static inline void tick_check_nohz_this_cpu(void)
{
- struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+ struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
ktime_t now;
if (!ts->idle_active && !ts->tick_stopped)
return;
now = ktime_get();
if (ts->idle_active)
- tick_nohz_stop_idle(cpu, now);
+ tick_nohz_stop_idle(ts, now);
if (ts->tick_stopped) {
tick_nohz_update_jiffies(now);
- tick_nohz_kick_tick(cpu, now);
+ tick_nohz_kick_tick(ts, now);
}
}
#else
static inline void tick_nohz_switch_to_nohz(void) { }
-static inline void tick_check_nohz(int cpu) { }
+static inline void tick_check_nohz_this_cpu(void) { }
#endif /* CONFIG_NO_HZ_COMMON */
/*
* Called from irq_enter to notify about the possible interruption of idle()
*/
-void tick_check_idle(int cpu)
+void tick_check_idle(void)
{
- tick_check_oneshot_broadcast(cpu);
- tick_check_nohz(cpu);
+ tick_check_oneshot_broadcast_this_cpu();
+ tick_check_nohz_this_cpu();
}
/*
projects / ~andy / linux / blobdiff