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sched: Move cputime code to its own file
Extract cputime code from the giant sched/core.c and put it in its own file. This make it easier to deal with this particular area and de-bloat a bit more core.c Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org>
This commit is contained in:
Frederic Weisbecker
parent
b952741c80
commit
73fbec6044
4 changed files with 570 additions and 556 deletions
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@ -11,7 +11,7 @@ ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
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CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer
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endif
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obj-y += core.o clock.o idle_task.o fair.o rt.o stop_task.o
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obj-y += core.o clock.o cputime.o idle_task.o fair.o rt.o stop_task.o
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obj-$(CONFIG_SMP) += cpupri.o
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obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
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obj-$(CONFIG_SCHEDSTATS) += stats.o
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@ -740,126 +740,6 @@ void deactivate_task(struct rq *rq, struct task_struct *p, int flags)
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dequeue_task(rq, p, flags);
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}
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#ifdef CONFIG_IRQ_TIME_ACCOUNTING
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/*
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* There are no locks covering percpu hardirq/softirq time.
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* They are only modified in account_system_vtime, on corresponding CPU
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* with interrupts disabled. So, writes are safe.
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* They are read and saved off onto struct rq in update_rq_clock().
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* This may result in other CPU reading this CPU's irq time and can
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* race with irq/account_system_vtime on this CPU. We would either get old
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* or new value with a side effect of accounting a slice of irq time to wrong
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* task when irq is in progress while we read rq->clock. That is a worthy
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* compromise in place of having locks on each irq in account_system_time.
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*/
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static DEFINE_PER_CPU(u64, cpu_hardirq_time);
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static DEFINE_PER_CPU(u64, cpu_softirq_time);
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static DEFINE_PER_CPU(u64, irq_start_time);
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static int sched_clock_irqtime;
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void enable_sched_clock_irqtime(void)
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{
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sched_clock_irqtime = 1;
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}
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void disable_sched_clock_irqtime(void)
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{
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sched_clock_irqtime = 0;
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}
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#ifndef CONFIG_64BIT
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static DEFINE_PER_CPU(seqcount_t, irq_time_seq);
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static inline void irq_time_write_begin(void)
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{
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__this_cpu_inc(irq_time_seq.sequence);
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smp_wmb();
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}
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static inline void irq_time_write_end(void)
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{
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smp_wmb();
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__this_cpu_inc(irq_time_seq.sequence);
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}
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static inline u64 irq_time_read(int cpu)
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{
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u64 irq_time;
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unsigned seq;
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do {
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seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu));
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irq_time = per_cpu(cpu_softirq_time, cpu) +
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per_cpu(cpu_hardirq_time, cpu);
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} while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq));
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return irq_time;
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}
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#else /* CONFIG_64BIT */
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static inline void irq_time_write_begin(void)
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{
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}
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static inline void irq_time_write_end(void)
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{
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}
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static inline u64 irq_time_read(int cpu)
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{
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return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu);
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}
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#endif /* CONFIG_64BIT */
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/*
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* Called before incrementing preempt_count on {soft,}irq_enter
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* and before decrementing preempt_count on {soft,}irq_exit.
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*/
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void account_system_vtime(struct task_struct *curr)
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{
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unsigned long flags;
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s64 delta;
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int cpu;
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if (!sched_clock_irqtime)
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return;
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local_irq_save(flags);
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cpu = smp_processor_id();
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delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time);
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__this_cpu_add(irq_start_time, delta);
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irq_time_write_begin();
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/*
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* We do not account for softirq time from ksoftirqd here.
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* We want to continue accounting softirq time to ksoftirqd thread
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* in that case, so as not to confuse scheduler with a special task
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* that do not consume any time, but still wants to run.
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*/
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if (hardirq_count())
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__this_cpu_add(cpu_hardirq_time, delta);
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else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
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__this_cpu_add(cpu_softirq_time, delta);
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irq_time_write_end();
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(account_system_vtime);
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#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
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#ifdef CONFIG_PARAVIRT
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static inline u64 steal_ticks(u64 steal)
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{
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if (unlikely(steal > NSEC_PER_SEC))
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return div_u64(steal, TICK_NSEC);
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return __iter_div_u64_rem(steal, TICK_NSEC, &steal);
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}
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#endif
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static void update_rq_clock_task(struct rq *rq, s64 delta)
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{
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/*
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@ -920,43 +800,6 @@ static void update_rq_clock_task(struct rq *rq, s64 delta)
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#endif
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}
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#ifdef CONFIG_IRQ_TIME_ACCOUNTING
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static int irqtime_account_hi_update(void)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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unsigned long flags;
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u64 latest_ns;
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int ret = 0;
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local_irq_save(flags);
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latest_ns = this_cpu_read(cpu_hardirq_time);
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if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_IRQ])
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ret = 1;
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local_irq_restore(flags);
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return ret;
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}
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static int irqtime_account_si_update(void)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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unsigned long flags;
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u64 latest_ns;
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int ret = 0;
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local_irq_save(flags);
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latest_ns = this_cpu_read(cpu_softirq_time);
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if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_SOFTIRQ])
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ret = 1;
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local_irq_restore(flags);
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return ret;
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}
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#else /* CONFIG_IRQ_TIME_ACCOUNTING */
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#define sched_clock_irqtime (0)
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#endif
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void sched_set_stop_task(int cpu, struct task_struct *stop)
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{
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struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
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@ -2809,404 +2652,6 @@ unsigned long long task_sched_runtime(struct task_struct *p)
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return ns;
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}
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#ifdef CONFIG_CGROUP_CPUACCT
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struct cgroup_subsys cpuacct_subsys;
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struct cpuacct root_cpuacct;
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#endif
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static inline void task_group_account_field(struct task_struct *p, int index,
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u64 tmp)
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{
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#ifdef CONFIG_CGROUP_CPUACCT
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struct kernel_cpustat *kcpustat;
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struct cpuacct *ca;
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#endif
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/*
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* Since all updates are sure to touch the root cgroup, we
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* get ourselves ahead and touch it first. If the root cgroup
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* is the only cgroup, then nothing else should be necessary.
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*
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*/
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__get_cpu_var(kernel_cpustat).cpustat[index] += tmp;
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#ifdef CONFIG_CGROUP_CPUACCT
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if (unlikely(!cpuacct_subsys.active))
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return;
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rcu_read_lock();
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ca = task_ca(p);
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while (ca && (ca != &root_cpuacct)) {
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kcpustat = this_cpu_ptr(ca->cpustat);
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kcpustat->cpustat[index] += tmp;
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ca = parent_ca(ca);
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}
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rcu_read_unlock();
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#endif
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}
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/*
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* Account user cpu time to a process.
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* @p: the process that the cpu time gets accounted to
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* @cputime: the cpu time spent in user space since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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*/
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void account_user_time(struct task_struct *p, cputime_t cputime,
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cputime_t cputime_scaled)
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{
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int index;
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/* Add user time to process. */
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p->utime += cputime;
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p->utimescaled += cputime_scaled;
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account_group_user_time(p, cputime);
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index = (TASK_NICE(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
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/* Add user time to cpustat. */
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task_group_account_field(p, index, (__force u64) cputime);
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/* Account for user time used */
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acct_update_integrals(p);
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}
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/*
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* Account guest cpu time to a process.
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* @p: the process that the cpu time gets accounted to
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* @cputime: the cpu time spent in virtual machine since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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*/
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static void account_guest_time(struct task_struct *p, cputime_t cputime,
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cputime_t cputime_scaled)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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/* Add guest time to process. */
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p->utime += cputime;
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p->utimescaled += cputime_scaled;
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account_group_user_time(p, cputime);
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p->gtime += cputime;
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/* Add guest time to cpustat. */
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if (TASK_NICE(p) > 0) {
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cpustat[CPUTIME_NICE] += (__force u64) cputime;
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cpustat[CPUTIME_GUEST_NICE] += (__force u64) cputime;
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} else {
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cpustat[CPUTIME_USER] += (__force u64) cputime;
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cpustat[CPUTIME_GUEST] += (__force u64) cputime;
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}
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}
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/*
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* Account system cpu time to a process and desired cpustat field
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* @p: the process that the cpu time gets accounted to
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* @cputime: the cpu time spent in kernel space since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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* @target_cputime64: pointer to cpustat field that has to be updated
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*/
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static inline
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void __account_system_time(struct task_struct *p, cputime_t cputime,
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cputime_t cputime_scaled, int index)
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{
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/* Add system time to process. */
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p->stime += cputime;
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p->stimescaled += cputime_scaled;
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account_group_system_time(p, cputime);
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/* Add system time to cpustat. */
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task_group_account_field(p, index, (__force u64) cputime);
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/* Account for system time used */
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acct_update_integrals(p);
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}
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/*
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* Account system cpu time to a process.
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* @p: the process that the cpu time gets accounted to
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* @hardirq_offset: the offset to subtract from hardirq_count()
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* @cputime: the cpu time spent in kernel space since the last update
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* @cputime_scaled: cputime scaled by cpu frequency
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*/
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void account_system_time(struct task_struct *p, int hardirq_offset,
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cputime_t cputime, cputime_t cputime_scaled)
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{
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int index;
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if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
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account_guest_time(p, cputime, cputime_scaled);
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return;
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}
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if (hardirq_count() - hardirq_offset)
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index = CPUTIME_IRQ;
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else if (in_serving_softirq())
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index = CPUTIME_SOFTIRQ;
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else
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index = CPUTIME_SYSTEM;
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__account_system_time(p, cputime, cputime_scaled, index);
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}
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/*
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* Account for involuntary wait time.
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* @cputime: the cpu time spent in involuntary wait
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*/
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void account_steal_time(cputime_t cputime)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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cpustat[CPUTIME_STEAL] += (__force u64) cputime;
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}
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/*
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* Account for idle time.
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* @cputime: the cpu time spent in idle wait
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*/
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void account_idle_time(cputime_t cputime)
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{
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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struct rq *rq = this_rq();
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if (atomic_read(&rq->nr_iowait) > 0)
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cpustat[CPUTIME_IOWAIT] += (__force u64) cputime;
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else
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cpustat[CPUTIME_IDLE] += (__force u64) cputime;
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}
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static __always_inline bool steal_account_process_tick(void)
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{
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#ifdef CONFIG_PARAVIRT
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if (static_key_false(¶virt_steal_enabled)) {
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u64 steal, st = 0;
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steal = paravirt_steal_clock(smp_processor_id());
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steal -= this_rq()->prev_steal_time;
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st = steal_ticks(steal);
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this_rq()->prev_steal_time += st * TICK_NSEC;
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account_steal_time(st);
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return st;
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}
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#endif
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return false;
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}
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING
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#ifdef CONFIG_IRQ_TIME_ACCOUNTING
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/*
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* Account a tick to a process and cpustat
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* @p: the process that the cpu time gets accounted to
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* @user_tick: is the tick from userspace
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* @rq: the pointer to rq
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*
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* Tick demultiplexing follows the order
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* - pending hardirq update
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* - pending softirq update
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* - user_time
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* - idle_time
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* - system time
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* - check for guest_time
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* - else account as system_time
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*
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* Check for hardirq is done both for system and user time as there is
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* no timer going off while we are on hardirq and hence we may never get an
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* opportunity to update it solely in system time.
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* p->stime and friends are only updated on system time and not on irq
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* softirq as those do not count in task exec_runtime any more.
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*/
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static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
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struct rq *rq)
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{
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cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
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u64 *cpustat = kcpustat_this_cpu->cpustat;
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if (steal_account_process_tick())
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return;
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if (irqtime_account_hi_update()) {
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cpustat[CPUTIME_IRQ] += (__force u64) cputime_one_jiffy;
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} else if (irqtime_account_si_update()) {
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cpustat[CPUTIME_SOFTIRQ] += (__force u64) cputime_one_jiffy;
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} else if (this_cpu_ksoftirqd() == p) {
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/*
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* ksoftirqd time do not get accounted in cpu_softirq_time.
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* So, we have to handle it separately here.
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* Also, p->stime needs to be updated for ksoftirqd.
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*/
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__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
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CPUTIME_SOFTIRQ);
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} else if (user_tick) {
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account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
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} else if (p == rq->idle) {
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account_idle_time(cputime_one_jiffy);
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} else if (p->flags & PF_VCPU) { /* System time or guest time */
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account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
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} else {
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__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
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CPUTIME_SYSTEM);
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}
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}
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static void irqtime_account_idle_ticks(int ticks)
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{
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int i;
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struct rq *rq = this_rq();
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for (i = 0; i < ticks; i++)
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irqtime_account_process_tick(current, 0, rq);
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}
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#else /* CONFIG_IRQ_TIME_ACCOUNTING */
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static void irqtime_account_idle_ticks(int ticks) {}
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static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
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struct rq *rq) {}
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#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
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/*
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* Account a single tick of cpu time.
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* @p: the process that the cpu time gets accounted to
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* @user_tick: indicates if the tick is a user or a system tick
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*/
|
||||
void account_process_tick(struct task_struct *p, int user_tick)
|
||||
{
|
||||
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
|
||||
struct rq *rq = this_rq();
|
||||
|
||||
if (sched_clock_irqtime) {
|
||||
irqtime_account_process_tick(p, user_tick, rq);
|
||||
return;
|
||||
}
|
||||
|
||||
if (steal_account_process_tick())
|
||||
return;
|
||||
|
||||
if (user_tick)
|
||||
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
|
||||
else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
|
||||
account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
|
||||
one_jiffy_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 multiple ticks of idle time.
|
||||
* @ticks: number of stolen ticks
|
||||
*/
|
||||
void account_idle_ticks(unsigned long ticks)
|
||||
{
|
||||
|
||||
if (sched_clock_irqtime) {
|
||||
irqtime_account_idle_ticks(ticks);
|
||||
return;
|
||||
}
|
||||
|
||||
account_idle_time(jiffies_to_cputime(ticks));
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Use precise platform statistics if available:
|
||||
*/
|
||||
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
|
||||
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
*ut = p->utime;
|
||||
*st = p->stime;
|
||||
}
|
||||
|
||||
void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
struct task_cputime cputime;
|
||||
|
||||
thread_group_cputime(p, &cputime);
|
||||
|
||||
*ut = cputime.utime;
|
||||
*st = cputime.stime;
|
||||
}
|
||||
#else
|
||||
|
||||
#ifndef nsecs_to_cputime
|
||||
# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs)
|
||||
#endif
|
||||
|
||||
static cputime_t scale_utime(cputime_t utime, cputime_t rtime, cputime_t total)
|
||||
{
|
||||
u64 temp = (__force u64) rtime;
|
||||
|
||||
temp *= (__force u64) utime;
|
||||
|
||||
if (sizeof(cputime_t) == 4)
|
||||
temp = div_u64(temp, (__force u32) total);
|
||||
else
|
||||
temp = div64_u64(temp, (__force u64) total);
|
||||
|
||||
return (__force cputime_t) temp;
|
||||
}
|
||||
|
||||
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
cputime_t rtime, utime = p->utime, total = utime + p->stime;
|
||||
|
||||
/*
|
||||
* Use CFS's precise accounting:
|
||||
*/
|
||||
rtime = nsecs_to_cputime(p->se.sum_exec_runtime);
|
||||
|
||||
if (total)
|
||||
utime = scale_utime(utime, rtime, total);
|
||||
else
|
||||
utime = rtime;
|
||||
|
||||
/*
|
||||
* Compare with previous values, to keep monotonicity:
|
||||
*/
|
||||
p->prev_utime = max(p->prev_utime, utime);
|
||||
p->prev_stime = max(p->prev_stime, rtime - p->prev_utime);
|
||||
|
||||
*ut = p->prev_utime;
|
||||
*st = p->prev_stime;
|
||||
}
|
||||
|
||||
/*
|
||||
* Must be called with siglock held.
|
||||
*/
|
||||
void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
struct signal_struct *sig = p->signal;
|
||||
struct task_cputime cputime;
|
||||
cputime_t rtime, utime, total;
|
||||
|
||||
thread_group_cputime(p, &cputime);
|
||||
|
||||
total = cputime.utime + cputime.stime;
|
||||
rtime = nsecs_to_cputime(cputime.sum_exec_runtime);
|
||||
|
||||
if (total)
|
||||
utime = scale_utime(cputime.utime, rtime, total);
|
||||
else
|
||||
utime = rtime;
|
||||
|
||||
sig->prev_utime = max(sig->prev_utime, utime);
|
||||
sig->prev_stime = max(sig->prev_stime, rtime - sig->prev_utime);
|
||||
|
||||
*ut = sig->prev_utime;
|
||||
*st = sig->prev_stime;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* This function gets called by the timer code, with HZ frequency.
|
||||
* We call it with interrupts disabled.
|
||||
|
|
@ -8419,6 +7864,8 @@ struct cgroup_subsys cpu_cgroup_subsys = {
|
|||
* (balbir@in.ibm.com).
|
||||
*/
|
||||
|
||||
struct cpuacct root_cpuacct;
|
||||
|
||||
/* create a new cpu accounting group */
|
||||
static struct cgroup_subsys_state *cpuacct_create(struct cgroup *cgrp)
|
||||
{
|
||||
|
|
|
|||
504
kernel/sched/cputime.c
Normal file
504
kernel/sched/cputime.c
Normal file
|
|
@ -0,0 +1,504 @@
|
|||
#include <linux/export.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/tsacct_kern.h>
|
||||
#include <linux/kernel_stat.h>
|
||||
#include <linux/static_key.h>
|
||||
#include "sched.h"
|
||||
|
||||
|
||||
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
||||
|
||||
/*
|
||||
* There are no locks covering percpu hardirq/softirq time.
|
||||
* They are only modified in account_system_vtime, on corresponding CPU
|
||||
* with interrupts disabled. So, writes are safe.
|
||||
* They are read and saved off onto struct rq in update_rq_clock().
|
||||
* This may result in other CPU reading this CPU's irq time and can
|
||||
* race with irq/account_system_vtime on this CPU. We would either get old
|
||||
* or new value with a side effect of accounting a slice of irq time to wrong
|
||||
* task when irq is in progress while we read rq->clock. That is a worthy
|
||||
* compromise in place of having locks on each irq in account_system_time.
|
||||
*/
|
||||
DEFINE_PER_CPU(u64, cpu_hardirq_time);
|
||||
DEFINE_PER_CPU(u64, cpu_softirq_time);
|
||||
|
||||
static DEFINE_PER_CPU(u64, irq_start_time);
|
||||
static int sched_clock_irqtime;
|
||||
|
||||
void enable_sched_clock_irqtime(void)
|
||||
{
|
||||
sched_clock_irqtime = 1;
|
||||
}
|
||||
|
||||
void disable_sched_clock_irqtime(void)
|
||||
{
|
||||
sched_clock_irqtime = 0;
|
||||
}
|
||||
|
||||
#ifndef CONFIG_64BIT
|
||||
DEFINE_PER_CPU(seqcount_t, irq_time_seq);
|
||||
#endif /* CONFIG_64BIT */
|
||||
|
||||
/*
|
||||
* Called before incrementing preempt_count on {soft,}irq_enter
|
||||
* and before decrementing preempt_count on {soft,}irq_exit.
|
||||
*/
|
||||
void account_system_vtime(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);
|
||||
|
||||
irq_time_write_begin();
|
||||
/*
|
||||
* We do not account for softirq time from ksoftirqd here.
|
||||
* We want to continue accounting softirq time to ksoftirqd thread
|
||||
* in that case, so as not to confuse scheduler with a special task
|
||||
* that do not consume any time, but still wants to run.
|
||||
*/
|
||||
if (hardirq_count())
|
||||
__this_cpu_add(cpu_hardirq_time, delta);
|
||||
else if (in_serving_softirq() && curr != this_cpu_ksoftirqd())
|
||||
__this_cpu_add(cpu_softirq_time, delta);
|
||||
|
||||
irq_time_write_end();
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(account_system_vtime);
|
||||
|
||||
static int irqtime_account_hi_update(void)
|
||||
{
|
||||
u64 *cpustat = kcpustat_this_cpu->cpustat;
|
||||
unsigned long flags;
|
||||
u64 latest_ns;
|
||||
int ret = 0;
|
||||
|
||||
local_irq_save(flags);
|
||||
latest_ns = this_cpu_read(cpu_hardirq_time);
|
||||
if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_IRQ])
|
||||
ret = 1;
|
||||
local_irq_restore(flags);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int irqtime_account_si_update(void)
|
||||
{
|
||||
u64 *cpustat = kcpustat_this_cpu->cpustat;
|
||||
unsigned long flags;
|
||||
u64 latest_ns;
|
||||
int ret = 0;
|
||||
|
||||
local_irq_save(flags);
|
||||
latest_ns = this_cpu_read(cpu_softirq_time);
|
||||
if (nsecs_to_cputime64(latest_ns) > cpustat[CPUTIME_SOFTIRQ])
|
||||
ret = 1;
|
||||
local_irq_restore(flags);
|
||||
return ret;
|
||||
}
|
||||
|
||||
#else /* CONFIG_IRQ_TIME_ACCOUNTING */
|
||||
|
||||
#define sched_clock_irqtime (0)
|
||||
|
||||
#endif /* !CONFIG_IRQ_TIME_ACCOUNTING */
|
||||
|
||||
static inline void task_group_account_field(struct task_struct *p, int index,
|
||||
u64 tmp)
|
||||
{
|
||||
#ifdef CONFIG_CGROUP_CPUACCT
|
||||
struct kernel_cpustat *kcpustat;
|
||||
struct cpuacct *ca;
|
||||
#endif
|
||||
/*
|
||||
* Since all updates are sure to touch the root cgroup, we
|
||||
* get ourselves ahead and touch it first. If the root cgroup
|
||||
* is the only cgroup, then nothing else should be necessary.
|
||||
*
|
||||
*/
|
||||
__get_cpu_var(kernel_cpustat).cpustat[index] += tmp;
|
||||
|
||||
#ifdef CONFIG_CGROUP_CPUACCT
|
||||
if (unlikely(!cpuacct_subsys.active))
|
||||
return;
|
||||
|
||||
rcu_read_lock();
|
||||
ca = task_ca(p);
|
||||
while (ca && (ca != &root_cpuacct)) {
|
||||
kcpustat = this_cpu_ptr(ca->cpustat);
|
||||
kcpustat->cpustat[index] += tmp;
|
||||
ca = parent_ca(ca);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Account user cpu time to a process.
|
||||
* @p: the process that the cpu time gets accounted to
|
||||
* @cputime: the cpu time spent in user space since the last update
|
||||
* @cputime_scaled: cputime scaled by cpu frequency
|
||||
*/
|
||||
void account_user_time(struct task_struct *p, cputime_t cputime,
|
||||
cputime_t cputime_scaled)
|
||||
{
|
||||
int index;
|
||||
|
||||
/* Add user time to process. */
|
||||
p->utime += cputime;
|
||||
p->utimescaled += cputime_scaled;
|
||||
account_group_user_time(p, cputime);
|
||||
|
||||
index = (TASK_NICE(p) > 0) ? CPUTIME_NICE : CPUTIME_USER;
|
||||
|
||||
/* Add user time to cpustat. */
|
||||
task_group_account_field(p, index, (__force u64) cputime);
|
||||
|
||||
/* Account for user time used */
|
||||
acct_update_integrals(p);
|
||||
}
|
||||
|
||||
/*
|
||||
* Account guest cpu time to a process.
|
||||
* @p: the process that the cpu time gets accounted to
|
||||
* @cputime: the cpu time spent in virtual machine since the last update
|
||||
* @cputime_scaled: cputime scaled by cpu frequency
|
||||
*/
|
||||
static void account_guest_time(struct task_struct *p, cputime_t cputime,
|
||||
cputime_t cputime_scaled)
|
||||
{
|
||||
u64 *cpustat = kcpustat_this_cpu->cpustat;
|
||||
|
||||
/* Add guest time to process. */
|
||||
p->utime += cputime;
|
||||
p->utimescaled += cputime_scaled;
|
||||
account_group_user_time(p, cputime);
|
||||
p->gtime += cputime;
|
||||
|
||||
/* Add guest time to cpustat. */
|
||||
if (TASK_NICE(p) > 0) {
|
||||
cpustat[CPUTIME_NICE] += (__force u64) cputime;
|
||||
cpustat[CPUTIME_GUEST_NICE] += (__force u64) cputime;
|
||||
} else {
|
||||
cpustat[CPUTIME_USER] += (__force u64) cputime;
|
||||
cpustat[CPUTIME_GUEST] += (__force u64) cputime;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Account system cpu time to a process and desired cpustat field
|
||||
* @p: the process that the cpu time gets accounted to
|
||||
* @cputime: the cpu time spent in kernel space since the last update
|
||||
* @cputime_scaled: cputime scaled by cpu frequency
|
||||
* @target_cputime64: pointer to cpustat field that has to be updated
|
||||
*/
|
||||
static inline
|
||||
void __account_system_time(struct task_struct *p, cputime_t cputime,
|
||||
cputime_t cputime_scaled, int index)
|
||||
{
|
||||
/* Add system time to process. */
|
||||
p->stime += cputime;
|
||||
p->stimescaled += cputime_scaled;
|
||||
account_group_system_time(p, cputime);
|
||||
|
||||
/* Add system time to cpustat. */
|
||||
task_group_account_field(p, index, (__force u64) cputime);
|
||||
|
||||
/* Account for system time used */
|
||||
acct_update_integrals(p);
|
||||
}
|
||||
|
||||
/*
|
||||
* Account system cpu time to a process.
|
||||
* @p: the process that the cpu time gets accounted to
|
||||
* @hardirq_offset: the offset to subtract from hardirq_count()
|
||||
* @cputime: the cpu time spent in kernel space since the last update
|
||||
* @cputime_scaled: cputime scaled by cpu frequency
|
||||
*/
|
||||
void account_system_time(struct task_struct *p, int hardirq_offset,
|
||||
cputime_t cputime, cputime_t cputime_scaled)
|
||||
{
|
||||
int index;
|
||||
|
||||
if ((p->flags & PF_VCPU) && (irq_count() - hardirq_offset == 0)) {
|
||||
account_guest_time(p, cputime, cputime_scaled);
|
||||
return;
|
||||
}
|
||||
|
||||
if (hardirq_count() - hardirq_offset)
|
||||
index = CPUTIME_IRQ;
|
||||
else if (in_serving_softirq())
|
||||
index = CPUTIME_SOFTIRQ;
|
||||
else
|
||||
index = CPUTIME_SYSTEM;
|
||||
|
||||
__account_system_time(p, cputime, cputime_scaled, index);
|
||||
}
|
||||
|
||||
/*
|
||||
* Account for involuntary wait time.
|
||||
* @cputime: the cpu time spent in involuntary wait
|
||||
*/
|
||||
void account_steal_time(cputime_t cputime)
|
||||
{
|
||||
u64 *cpustat = kcpustat_this_cpu->cpustat;
|
||||
|
||||
cpustat[CPUTIME_STEAL] += (__force u64) cputime;
|
||||
}
|
||||
|
||||
/*
|
||||
* Account for idle time.
|
||||
* @cputime: the cpu time spent in idle wait
|
||||
*/
|
||||
void account_idle_time(cputime_t cputime)
|
||||
{
|
||||
u64 *cpustat = kcpustat_this_cpu->cpustat;
|
||||
struct rq *rq = this_rq();
|
||||
|
||||
if (atomic_read(&rq->nr_iowait) > 0)
|
||||
cpustat[CPUTIME_IOWAIT] += (__force u64) cputime;
|
||||
else
|
||||
cpustat[CPUTIME_IDLE] += (__force u64) cputime;
|
||||
}
|
||||
|
||||
static __always_inline bool steal_account_process_tick(void)
|
||||
{
|
||||
#ifdef CONFIG_PARAVIRT
|
||||
if (static_key_false(¶virt_steal_enabled)) {
|
||||
u64 steal, st = 0;
|
||||
|
||||
steal = paravirt_steal_clock(smp_processor_id());
|
||||
steal -= this_rq()->prev_steal_time;
|
||||
|
||||
st = steal_ticks(steal);
|
||||
this_rq()->prev_steal_time += st * TICK_NSEC;
|
||||
|
||||
account_steal_time(st);
|
||||
return st;
|
||||
}
|
||||
#endif
|
||||
return false;
|
||||
}
|
||||
|
||||
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
|
||||
|
||||
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
||||
/*
|
||||
* Account a tick to a process and cpustat
|
||||
* @p: the process that the cpu time gets accounted to
|
||||
* @user_tick: is the tick from userspace
|
||||
* @rq: the pointer to rq
|
||||
*
|
||||
* Tick demultiplexing follows the order
|
||||
* - pending hardirq update
|
||||
* - pending softirq update
|
||||
* - user_time
|
||||
* - idle_time
|
||||
* - system time
|
||||
* - check for guest_time
|
||||
* - else account as system_time
|
||||
*
|
||||
* Check for hardirq is done both for system and user time as there is
|
||||
* no timer going off while we are on hardirq and hence we may never get an
|
||||
* opportunity to update it solely in system time.
|
||||
* p->stime and friends are only updated on system time and not on irq
|
||||
* softirq as those do not count in task exec_runtime any more.
|
||||
*/
|
||||
static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
|
||||
struct rq *rq)
|
||||
{
|
||||
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
|
||||
u64 *cpustat = kcpustat_this_cpu->cpustat;
|
||||
|
||||
if (steal_account_process_tick())
|
||||
return;
|
||||
|
||||
if (irqtime_account_hi_update()) {
|
||||
cpustat[CPUTIME_IRQ] += (__force u64) cputime_one_jiffy;
|
||||
} else if (irqtime_account_si_update()) {
|
||||
cpustat[CPUTIME_SOFTIRQ] += (__force u64) cputime_one_jiffy;
|
||||
} else if (this_cpu_ksoftirqd() == p) {
|
||||
/*
|
||||
* ksoftirqd time do not get accounted in cpu_softirq_time.
|
||||
* So, we have to handle it separately here.
|
||||
* Also, p->stime needs to be updated for ksoftirqd.
|
||||
*/
|
||||
__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
|
||||
CPUTIME_SOFTIRQ);
|
||||
} else if (user_tick) {
|
||||
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
|
||||
} else if (p == rq->idle) {
|
||||
account_idle_time(cputime_one_jiffy);
|
||||
} else if (p->flags & PF_VCPU) { /* System time or guest time */
|
||||
account_guest_time(p, cputime_one_jiffy, one_jiffy_scaled);
|
||||
} else {
|
||||
__account_system_time(p, cputime_one_jiffy, one_jiffy_scaled,
|
||||
CPUTIME_SYSTEM);
|
||||
}
|
||||
}
|
||||
|
||||
static void irqtime_account_idle_ticks(int ticks)
|
||||
{
|
||||
int i;
|
||||
struct rq *rq = this_rq();
|
||||
|
||||
for (i = 0; i < ticks; i++)
|
||||
irqtime_account_process_tick(current, 0, rq);
|
||||
}
|
||||
#else /* CONFIG_IRQ_TIME_ACCOUNTING */
|
||||
static void irqtime_account_idle_ticks(int ticks) {}
|
||||
static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
|
||||
struct rq *rq) {}
|
||||
#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
|
||||
|
||||
/*
|
||||
* Account a single tick of cpu time.
|
||||
* @p: the process that the cpu time gets accounted to
|
||||
* @user_tick: indicates if the tick is a user or a system tick
|
||||
*/
|
||||
void account_process_tick(struct task_struct *p, int user_tick)
|
||||
{
|
||||
cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
|
||||
struct rq *rq = this_rq();
|
||||
|
||||
if (sched_clock_irqtime) {
|
||||
irqtime_account_process_tick(p, user_tick, rq);
|
||||
return;
|
||||
}
|
||||
|
||||
if (steal_account_process_tick())
|
||||
return;
|
||||
|
||||
if (user_tick)
|
||||
account_user_time(p, cputime_one_jiffy, one_jiffy_scaled);
|
||||
else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
|
||||
account_system_time(p, HARDIRQ_OFFSET, cputime_one_jiffy,
|
||||
one_jiffy_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 multiple ticks of idle time.
|
||||
* @ticks: number of stolen ticks
|
||||
*/
|
||||
void account_idle_ticks(unsigned long ticks)
|
||||
{
|
||||
|
||||
if (sched_clock_irqtime) {
|
||||
irqtime_account_idle_ticks(ticks);
|
||||
return;
|
||||
}
|
||||
|
||||
account_idle_time(jiffies_to_cputime(ticks));
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Use precise platform statistics if available:
|
||||
*/
|
||||
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
|
||||
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
*ut = p->utime;
|
||||
*st = p->stime;
|
||||
}
|
||||
|
||||
void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
struct task_cputime cputime;
|
||||
|
||||
thread_group_cputime(p, &cputime);
|
||||
|
||||
*ut = cputime.utime;
|
||||
*st = cputime.stime;
|
||||
}
|
||||
#else
|
||||
|
||||
#ifndef nsecs_to_cputime
|
||||
# define nsecs_to_cputime(__nsecs) nsecs_to_jiffies(__nsecs)
|
||||
#endif
|
||||
|
||||
static cputime_t scale_utime(cputime_t utime, cputime_t rtime, cputime_t total)
|
||||
{
|
||||
u64 temp = (__force u64) rtime;
|
||||
|
||||
temp *= (__force u64) utime;
|
||||
|
||||
if (sizeof(cputime_t) == 4)
|
||||
temp = div_u64(temp, (__force u32) total);
|
||||
else
|
||||
temp = div64_u64(temp, (__force u64) total);
|
||||
|
||||
return (__force cputime_t) temp;
|
||||
}
|
||||
|
||||
void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
cputime_t rtime, utime = p->utime, total = utime + p->stime;
|
||||
|
||||
/*
|
||||
* Use CFS's precise accounting:
|
||||
*/
|
||||
rtime = nsecs_to_cputime(p->se.sum_exec_runtime);
|
||||
|
||||
if (total)
|
||||
utime = scale_utime(utime, rtime, total);
|
||||
else
|
||||
utime = rtime;
|
||||
|
||||
/*
|
||||
* Compare with previous values, to keep monotonicity:
|
||||
*/
|
||||
p->prev_utime = max(p->prev_utime, utime);
|
||||
p->prev_stime = max(p->prev_stime, rtime - p->prev_utime);
|
||||
|
||||
*ut = p->prev_utime;
|
||||
*st = p->prev_stime;
|
||||
}
|
||||
|
||||
/*
|
||||
* Must be called with siglock held.
|
||||
*/
|
||||
void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st)
|
||||
{
|
||||
struct signal_struct *sig = p->signal;
|
||||
struct task_cputime cputime;
|
||||
cputime_t rtime, utime, total;
|
||||
|
||||
thread_group_cputime(p, &cputime);
|
||||
|
||||
total = cputime.utime + cputime.stime;
|
||||
rtime = nsecs_to_cputime(cputime.sum_exec_runtime);
|
||||
|
||||
if (total)
|
||||
utime = scale_utime(cputime.utime, rtime, total);
|
||||
else
|
||||
utime = rtime;
|
||||
|
||||
sig->prev_utime = max(sig->prev_utime, utime);
|
||||
sig->prev_stime = max(sig->prev_stime, rtime - sig->prev_utime);
|
||||
|
||||
*ut = sig->prev_utime;
|
||||
*st = sig->prev_stime;
|
||||
}
|
||||
#endif
|
||||
|
|
@ -891,6 +891,9 @@ struct cpuacct {
|
|||
struct kernel_cpustat __percpu *cpustat;
|
||||
};
|
||||
|
||||
extern struct cgroup_subsys cpuacct_subsys;
|
||||
extern struct cpuacct root_cpuacct;
|
||||
|
||||
/* return cpu accounting group corresponding to this container */
|
||||
static inline struct cpuacct *cgroup_ca(struct cgroup *cgrp)
|
||||
{
|
||||
|
|
@ -917,6 +920,16 @@ extern void cpuacct_charge(struct task_struct *tsk, u64 cputime);
|
|||
static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime) {}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_PARAVIRT
|
||||
static inline u64 steal_ticks(u64 steal)
|
||||
{
|
||||
if (unlikely(steal > NSEC_PER_SEC))
|
||||
return div_u64(steal, TICK_NSEC);
|
||||
|
||||
return __iter_div_u64_rem(steal, TICK_NSEC, &steal);
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline void inc_nr_running(struct rq *rq)
|
||||
{
|
||||
rq->nr_running++;
|
||||
|
|
@ -1157,3 +1170,53 @@ enum rq_nohz_flag_bits {
|
|||
|
||||
#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
||||
|
||||
DECLARE_PER_CPU(u64, cpu_hardirq_time);
|
||||
DECLARE_PER_CPU(u64, cpu_softirq_time);
|
||||
|
||||
#ifndef CONFIG_64BIT
|
||||
DECLARE_PER_CPU(seqcount_t, irq_time_seq);
|
||||
|
||||
static inline void irq_time_write_begin(void)
|
||||
{
|
||||
__this_cpu_inc(irq_time_seq.sequence);
|
||||
smp_wmb();
|
||||
}
|
||||
|
||||
static inline void irq_time_write_end(void)
|
||||
{
|
||||
smp_wmb();
|
||||
__this_cpu_inc(irq_time_seq.sequence);
|
||||
}
|
||||
|
||||
static inline u64 irq_time_read(int cpu)
|
||||
{
|
||||
u64 irq_time;
|
||||
unsigned seq;
|
||||
|
||||
do {
|
||||
seq = read_seqcount_begin(&per_cpu(irq_time_seq, cpu));
|
||||
irq_time = per_cpu(cpu_softirq_time, cpu) +
|
||||
per_cpu(cpu_hardirq_time, cpu);
|
||||
} while (read_seqcount_retry(&per_cpu(irq_time_seq, cpu), seq));
|
||||
|
||||
return irq_time;
|
||||
}
|
||||
#else /* CONFIG_64BIT */
|
||||
static inline void irq_time_write_begin(void)
|
||||
{
|
||||
}
|
||||
|
||||
static inline void irq_time_write_end(void)
|
||||
{
|
||||
}
|
||||
|
||||
static inline u64 irq_time_read(int cpu)
|
||||
{
|
||||
return per_cpu(cpu_softirq_time, cpu) + per_cpu(cpu_hardirq_time, cpu);
|
||||
}
|
||||
#endif /* CONFIG_64BIT */
|
||||
#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue