/* * 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); } }
/* * 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; /* Shall be converted to a lockdep-enabled lightweight check */ WARN_ON_ONCE(!irqs_disabled()); 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; }