*/
void irqtime_account_irq(struct task_struct *curr)
{
- unsigned long flags;
s64 delta;
int cpu;
if (!sched_clock_irqtime)
return;
- local_irq_save(flags);
-
cpu = smp_processor_id();
delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time);
__this_cpu_add(irq_start_time, delta);
__this_cpu_add(cpu_softirq_time, delta);
irq_time_write_end();
- local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(irqtime_account_irq);
-static int irqtime_account_hi_update(void)
+static cputime_t irqtime_account_hi_update(cputime_t maxtime)
{
u64 *cpustat = kcpustat_this_cpu->cpustat;
unsigned long flags;
- u64 latest_ns;
- int ret = 0;
+ cputime_t irq_cputime;
local_irq_save(flags);
- latest_ns = this_cpu_read(cpu_hardirq_time);
- if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_IRQ])
- ret = 1;
+ irq_cputime = nsecs_to_cputime64(this_cpu_read(cpu_hardirq_time)) -
+ cpustat[CPUTIME_IRQ];
+ irq_cputime = min(irq_cputime, maxtime);
+ cpustat[CPUTIME_IRQ] += irq_cputime;
local_irq_restore(flags);
- return ret;
+ return irq_cputime;
}
-static int irqtime_account_si_update(void)
+static cputime_t irqtime_account_si_update(cputime_t maxtime)
{
u64 *cpustat = kcpustat_this_cpu->cpustat;
unsigned long flags;
- u64 latest_ns;
- int ret = 0;
+ cputime_t softirq_cputime;
local_irq_save(flags);
- latest_ns = this_cpu_read(cpu_softirq_time);
- if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_SOFTIRQ])
- ret = 1;
+ softirq_cputime = nsecs_to_cputime64(this_cpu_read(cpu_softirq_time)) -
+ cpustat[CPUTIME_SOFTIRQ];
+ softirq_cputime = min(softirq_cputime, maxtime);
+ cpustat[CPUTIME_SOFTIRQ] += softirq_cputime;
local_irq_restore(flags);
- return ret;
+ return softirq_cputime;
}
#else /* CONFIG_IRQ_TIME_ACCOUNTING */
#define sched_clock_irqtime (0)
+static cputime_t irqtime_account_hi_update(cputime_t dummy)
+{
+ return 0;
+}
+
+static cputime_t irqtime_account_si_update(cputime_t dummy)
+{
+ return 0;
+}
+
#endif /* !CONFIG_IRQ_TIME_ACCOUNTING */
static inline void task_group_account_field(struct task_struct *p, int index,
cpustat[CPUTIME_IDLE] += (__force u64) cputime;
}
-static __always_inline bool steal_account_process_tick(void)
+static __always_inline cputime_t steal_account_process_time(cputime_t maxtime)
{
#ifdef CONFIG_PARAVIRT
if (static_key_false(¶virt_steal_enabled)) {
+ cputime_t steal_cputime;
u64 steal;
- unsigned long steal_jiffies;
steal = paravirt_steal_clock(smp_processor_id());
steal -= this_rq()->prev_steal_time;
- /*
- * steal is in nsecs but our caller is expecting steal
- * time in jiffies. Lets cast the result to jiffies
- * granularity and account the rest on the next rounds.
- */
- steal_jiffies = nsecs_to_jiffies(steal);
- this_rq()->prev_steal_time += jiffies_to_nsecs(steal_jiffies);
+ steal_cputime = min(nsecs_to_cputime(steal), maxtime);
+ account_steal_time(steal_cputime);
+ this_rq()->prev_steal_time += cputime_to_nsecs(steal_cputime);
- account_steal_time(jiffies_to_cputime(steal_jiffies));
- return steal_jiffies;
+ return steal_cputime;
}
#endif
- return false;
+ return 0;
+}
+
+/*
+ * Account how much elapsed time was spent in steal, irq, or softirq time.
+ */
+static inline cputime_t account_other_time(cputime_t max)
+{
+ cputime_t accounted;
+
+ accounted = steal_account_process_time(max);
+
+ if (accounted < max)
+ accounted += irqtime_account_hi_update(max - accounted);
+
+ if (accounted < max)
+ accounted += irqtime_account_si_update(max - accounted);
+
+ return accounted;
}
/*
static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
struct rq *rq, int ticks)
{
- cputime_t scaled = cputime_to_scaled(cputime_one_jiffy);
- u64 cputime = (__force u64) cputime_one_jiffy;
- u64 *cpustat = kcpustat_this_cpu->cpustat;
+ u64 cputime = (__force u64) cputime_one_jiffy * ticks;
+ cputime_t scaled, other;
- if (steal_account_process_tick())
+ /*
+ * When returning from idle, many ticks can get accounted at
+ * once, including some ticks of steal, irq, and softirq time.
+ * Subtract those ticks from the amount of time accounted to
+ * idle, or potentially user or system time. Due to rounding,
+ * other time can exceed ticks occasionally.
+ */
+ other = account_other_time(cputime);
+ if (other >= cputime)
return;
+ cputime -= other;
+ scaled = cputime_to_scaled(cputime);
- cputime *= ticks;
- scaled *= ticks;
-
- if (irqtime_account_hi_update()) {
- cpustat[CPUTIME_IRQ] += cputime;
- } else if (irqtime_account_si_update()) {
- cpustat[CPUTIME_SOFTIRQ] += cputime;
- } else if (this_cpu_ksoftirqd() == p) {
+ if (this_cpu_ksoftirqd() == p) {
/*
* ksoftirqd time do not get accounted in cpu_softirq_time.
* So, we have to handle it separately here.
}
#endif
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
+
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
/*
* Archs that account the whole time spent in the idle task
* (outside irq) as idle time can rely on this and just implement
* vtime_account().
*/
#ifndef __ARCH_HAS_VTIME_ACCOUNT
-void vtime_common_account_irq_enter(struct task_struct *tsk)
+void vtime_account_irq_enter(struct task_struct *tsk)
{
- if (!in_interrupt()) {
- /*
- * If we interrupted user, context_tracking_in_user()
- * is 1 because the context tracking don't hook
- * on irq entry/exit. This way we know if
- * we need to flush user time on kernel entry.
- */
- if (context_tracking_in_user()) {
- vtime_account_user(tsk);
- return;
- }
-
- if (is_idle_task(tsk)) {
- vtime_account_idle(tsk);
- return;
- }
- }
- vtime_account_system(tsk);
+ if (!in_interrupt() && is_idle_task(tsk))
+ vtime_account_idle(tsk);
+ else
+ vtime_account_system(tsk);
}
-EXPORT_SYMBOL_GPL(vtime_common_account_irq_enter);
+EXPORT_SYMBOL_GPL(vtime_account_irq_enter);
#endif /* __ARCH_HAS_VTIME_ACCOUNT */
-#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
-
-#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st)
{
*ut = p->utime;
*/
void account_process_tick(struct task_struct *p, int user_tick)
{
- cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
+ cputime_t cputime, scaled, steal;
struct rq *rq = this_rq();
if (vtime_accounting_cpu_enabled())
return;
}
- if (steal_account_process_tick())
+ cputime = cputime_one_jiffy;
+ steal = steal_account_process_time(cputime);
+
+ if (steal >= cputime)
return;
+ cputime -= steal;
+ scaled = cputime_to_scaled(cputime);
+
if (user_tick)
- account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
+ account_user_time(p, cputime, scaled);
else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
- account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
- one_jiffy_scaled);
+ account_system_time(p, HARDIRQ_OFFSET, cputime, scaled);
else
- account_idle_time(cputime_one_jiffy);
-}
-
-/*
- * Account multiple ticks of steal time.
- * @p: the process from which the cpu time has been stolen
- * @ticks: number of stolen ticks
- */
-void account_steal_ticks(unsigned long ticks)
-{
- account_steal_time(jiffies_to_cputime(ticks));
+ account_idle_time(cputime);
}
/*
static cputime_t get_vtime_delta(struct task_struct *tsk)
{
unsigned long now = READ_ONCE(jiffies);
- unsigned long delta = now - tsk->vtime_snap;
+ cputime_t delta, other;
+ delta = jiffies_to_cputime(now - tsk->vtime_snap);
+ other = account_other_time(delta);
WARN_ON_ONCE(tsk->vtime_snap_whence == VTIME_INACTIVE);
tsk->vtime_snap = now;
- return jiffies_to_cputime(delta);
+ return delta - other;
}
static void __vtime_account_system(struct task_struct *tsk)
write_seqcount_end(&tsk->vtime_seqcount);
}
-void vtime_gen_account_irq_exit(struct task_struct *tsk)
-{
- write_seqcount_begin(&tsk->vtime_seqcount);
- if (vtime_delta(tsk))
- __vtime_account_system(tsk);
- if (context_tracking_in_user())
- tsk->vtime_snap_whence = VTIME_USER;
- write_seqcount_end(&tsk->vtime_seqcount);
-}
-
void vtime_account_user(struct task_struct *tsk)
{
cputime_t delta_cpu;
git.samba.org / sfrench / cifs-2.6.git / blobdiff