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/* SPDX-License-Identifier: GPL-2.0 / #ifndef _LINUX_SCHED_CPUTIME_H #define _LINUX_SCHED_CPUTIME_H #include <linux/sched/signal.h> / * cputime accounting APIs: / #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE #include <asm/cputime.h> #ifndef cputime_to_nsecs # define cputime_to_nsecs(__ct) \ (cputime_to_usecs(__ct) NSEC_PER_USEC) #endif #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE / #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN extern void task_cputime(struct task_struct t, u64 utime, u64 stime); extern u64 task_gtime(struct task_struct t); #else static inline void task_cputime(struct task_struct t, u64 utime, u64 stime) { utime = t->utime; stime = t->stime; } static inline u64 task_gtime(struct task_struct t) { return t->gtime; } #endif #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME static inline void task_cputime_scaled(struct task_struct t, u64 utimescaled, u64 stimescaled) { utimescaled = t->utimescaled; stimescaled = t->stimescaled; } #else static inline void task_cputime_scaled(struct task_struct t, u64 utimescaled, u64 stimescaled) { task_cputime(t, utimescaled, stimescaled); } #endif extern void task_cputime_adjusted(struct task_struct p, u64 ut, u64 st); extern void thread_group_cputime_adjusted(struct task_struct p, u64 ut, u64 st); extern void cputime_adjust(struct task_cputime curr, struct prev_cputime prev, u64 ut, u64 st); / * Thread group CPU time accounting. / void thread_group_cputime(struct task_struct tsk, struct task_cputime times); void thread_group_sample_cputime(struct task_struct tsk, u64 samples); / * The following are functions that support scheduler-internal time accounting. * These functions are generally called at the timer tick. None of this depends * on CONFIG_SCHEDSTATS. / /* * get_running_cputimer - return &tsk->signal->cputimer if cputimers are active * * @tsk: Pointer to target task. / #ifdef CONFIG_POSIX_TIMERS static inline struct thread_group_cputimer get_running_cputimer(struct task_struct tsk) { struct thread_group_cputimer cputimer = &tsk->signal->cputimer; /* * Check whether posix CPU timers are active. If not the thread * group accounting is not active either. Lockless check. / if (!READ_ONCE(tsk->signal->posix_cputimers.timers_active)) return NULL; / * After we flush the task's sum_exec_runtime to sig->sum_sched_runtime * in __exit_signal(), we won't account to the signal struct further * cputime consumed by that task, even though the task can still be * ticking after __exit_signal(). * * In order to keep a consistent behaviour between thread group cputime * and thread group cputimer accounting, lets also ignore the cputime * elapsing after __exit_signal() in any thread group timer running. * * This makes sure that POSIX CPU clocks and timers are synchronized, so * that a POSIX CPU timer won't expire while the corresponding POSIX CPU * clock delta is behind the expiring timer value. / if (unlikely(!tsk->sighand)) return NULL; return cputimer; } #else static inline struct thread_group_cputimer get_running_cputimer(struct task_struct tsk) { return NULL; } #endif /* * account_group_user_time - Maintain utime for a thread group. * * @tsk: Pointer to task structure. * @cputime: Time value by which to increment the utime field of the * thread_group_cputime structure. * * If thread group time is being maintained, get the structure for the * running CPU and update the utime field there. / static inline void account_group_user_time(struct task_struct tsk, u64 cputime) { struct thread_group_cputimer cputimer = get_running_cputimer(tsk); if (!cputimer) return; atomic64_add(cputime, &cputimer->cputime_atomic.utime); } /* * account_group_system_time - Maintain stime for a thread group. * * @tsk: Pointer to task structure. * @cputime: Time value by which to increment the stime field of the * thread_group_cputime structure. * * If thread group time is being maintained, get the structure for the * running CPU and update the stime field there. / static inline void account_group_system_time(struct task_struct tsk, u64 cputime) { struct thread_group_cputimer cputimer = get_running_cputimer(tsk); if (!cputimer) return; atomic64_add(cputime, &cputimer->cputime_atomic.stime); } /* * account_group_exec_runtime - Maintain exec runtime for a thread group. * * @tsk: Pointer to task structure. * @ns: Time value by which to increment the sum_exec_runtime field * of the thread_group_cputime structure. * * If thread group time is being maintained, get the structure for the * running CPU and update the sum_exec_runtime field there. / static inline void account_group_exec_runtime(struct task_struct tsk, unsigned long long ns) { struct thread_group_cputimer cputimer = get_running_cputimer(tsk); if (!cputimer) return; atomic64_add(ns, &cputimer->cputime_atomic.sum_exec_runtime); } static inline void prev_cputime_init(struct prev_cputime prev) { #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE prev->utime = prev->stime = 0; raw_spin_lock_init(&prev->lock); #endif } extern unsigned long long task_sched_runtime(struct task_struct task); #endif / _LINUX_SCHED_CPUTIME_H */

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