diff options
-rw-r--r-- | kernel/sched/cputime.c | 27 | ||||
-rw-r--r-- | kernel/sched/sched.h | 9 |
2 files changed, 23 insertions, 13 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index f3778e2b..aea3135 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -34,6 +34,18 @@ void disable_sched_clock_irqtime(void) sched_clock_irqtime = 0; } +static void irqtime_account_delta(struct irqtime *irqtime, u64 delta, + enum cpu_usage_stat idx) +{ + u64 *cpustat = kcpustat_this_cpu->cpustat; + + u64_stats_update_begin(&irqtime->sync); + cpustat[idx] += delta; + irqtime->total += delta; + irqtime->tick_delta += delta; + u64_stats_update_end(&irqtime->sync); +} + /* * Called before incrementing preempt_count on {soft,}irq_enter * and before decrementing preempt_count on {soft,}irq_exit. @@ -41,7 +53,6 @@ void disable_sched_clock_irqtime(void) void irqtime_account_irq(struct task_struct *curr) { struct irqtime *irqtime = this_cpu_ptr(&cpu_irqtime); - u64 *cpustat = kcpustat_this_cpu->cpustat; s64 delta; int cpu; @@ -52,22 +63,16 @@ void irqtime_account_irq(struct task_struct *curr) delta = sched_clock_cpu(cpu) - irqtime->irq_start_time; irqtime->irq_start_time += delta; - u64_stats_update_begin(&irqtime->sync); /* * 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()) { - cpustat[CPUTIME_IRQ] += delta; - irqtime->tick_delta += delta; - } else if (in_serving_softirq() && curr != this_cpu_ksoftirqd()) { - cpustat[CPUTIME_SOFTIRQ] += delta; - irqtime->tick_delta += delta; - } - - u64_stats_update_end(&irqtime->sync); + if (hardirq_count()) + irqtime_account_delta(irqtime, delta, CPUTIME_IRQ); + else if (in_serving_softirq() && curr != this_cpu_ksoftirqd()) + irqtime_account_delta(irqtime, delta, CPUTIME_SOFTIRQ); } EXPORT_SYMBOL_GPL(irqtime_account_irq); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 5cbf922..767aab3 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1869,6 +1869,7 @@ static inline void nohz_balance_exit_idle(unsigned int cpu) { } #ifdef CONFIG_IRQ_TIME_ACCOUNTING struct irqtime { + u64 total; u64 tick_delta; u64 irq_start_time; struct u64_stats_sync sync; @@ -1876,16 +1877,20 @@ struct irqtime { DECLARE_PER_CPU(struct irqtime, cpu_irqtime); +/* + * Returns the irqtime minus the softirq time computed by ksoftirqd. + * Otherwise ksoftirqd's sum_exec_runtime is substracted its own runtime + * and never move forward. + */ static inline u64 irq_time_read(int cpu) { struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu); - u64 *cpustat = kcpustat_cpu(cpu).cpustat; unsigned int seq; u64 total; do { seq = __u64_stats_fetch_begin(&irqtime->sync); - total = cpustat[CPUTIME_SOFTIRQ] + cpustat[CPUTIME_IRQ]; + total = irqtime->total; } while (__u64_stats_fetch_retry(&irqtime->sync, seq)); return total; |