10  * There are no locks covering percpu hardirq/softirq time.
14  * This may result in other CPU reading this CPU's irq time and can
16  * or new value with a side effect of accounting a slice of irq time to wrong
64 	 * We do not account for softirq time from ksoftirqd here.  in irqtime_account_irq()
65 	 * We want to continue accounting softirq time to ksoftirqd thread  in irqtime_account_irq()
67 	 * that do not consume any time, but still wants to run.  in irqtime_account_irq()
113  * Account user CPU time to a process.
114  * @p: the process that the CPU time gets accounted to
115  * @cputime: the CPU time spent in user space since the last update
121 	/* Add user time to process. */  in account_user_time()
127 	/* Add user time to cpustat. */  in account_user_time()
130 	/* Account for user time used */  in account_user_time()
135  * Account guest CPU time to a process.
136  * @p: the process that the CPU time gets accounted to
137  * @cputime: the CPU time spent in virtual machine since the last update
143 	/* Add guest time to process. */  in account_guest_time()
148 	/* Add guest time to cpustat. */  in account_guest_time()
159  * Account system CPU time to a process and desired cpustat field
160  * @p: the process that the CPU time gets accounted to
161  * @cputime: the CPU time spent in kernel space since the last update
167 	/* Add system time to process. */  in account_system_index_time()
171 	/* Add system time to cpustat. */  in account_system_index_time()
174 	/* Account for system time used */  in account_system_index_time()
179  * Account system CPU time to a process.
180  * @p: the process that the CPU time gets accounted to
182  * @cputime: the CPU time spent in kernel space since the last update
204  * Account for involuntary wait time.
205  * @cputime: the CPU time spent in involuntary wait
215  * Account for idle time.
216  * @cputime: the CPU time spent in idle wait
230  * When a guest is interrupted for a longer amount of time, missed clock
232  * occasion account more time than the calling functions think elapsed.
253  * Account how much elapsed time was spent in steal, irq, or softirq time.
290  * Accumulate raw cputime values of dead tasks (sig->[us]time) and live
302 	 * Update current task runtime to account pending time since last  in thread_group_cputime()
338  * @p: the process that the CPU time gets accounted to
347  * - system time
351  * Check for hardirq is done both for system and user time as there is
353  * opportunity to update it solely in system time.
354  * p->stime and friends are only updated on system time and not on irq
364 	 * once, including some ticks of steal, irq, and softirq time.  in irqtime_account_process_tick()
365 	 * Subtract those ticks from the amount of time accounted to  in irqtime_account_process_tick()
366 	 * idle, or potentially user or system time. Due to rounding,  in irqtime_account_process_tick()
367 	 * other time can exceed ticks occasionally.  in irqtime_account_process_tick()
377 		 * ksoftirqd time do not get accounted in cpu_softirq_time.  in irqtime_account_process_tick()
386 	} else if (p->flags & PF_VCPU) { /* System time or guest time */  in irqtime_account_process_tick()
426  * Archs that account the whole time spent in the idle task
427  * (outside irq) as idle time can rely on this and just implement
429  * have other meaning of the idle time (s390 only includes the
430  * time spent by the CPU when it's in low power mode) must override
471  * Account a single tick of CPU time.
472  * @p: the process that the CPU time gets accounted to
505  * Account multiple ticks of idle time.
702 	 * ticks, and no need for steal time accounting to make up for  in get_vtime_delta()
704 	 * elapsed time. Limit account_other_time to prevent rounding  in get_vtime_delta()
859  * add up the pending nohz execution time since the last
887 		 * Task runs either in user or kernel space, add pending nohz time to  in task_cputime()