diff options
| -rw-r--r-- | include/linux/sched/cputime.h | 2 | ||||
| -rw-r--r-- | kernel/time/posix-cpu-timers.c | 21 |
2 files changed, 22 insertions, 1 deletions
diff --git a/include/linux/sched/cputime.h b/include/linux/sched/cputime.h index 53f883f5a2fd..6de7b384d2be 100644 --- a/include/linux/sched/cputime.h +++ b/include/linux/sched/cputime.h @@ -62,7 +62,7 @@ extern void cputime_adjust(struct task_cputime *curr, struct prev_cputime *prev, */ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); - +void thread_group_sample_cputime(struct task_struct *tsk, struct task_cputime *times); /* * The following are functions that support scheduler-internal time accounting. diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index 4426a0f9c470..c22b6b604a95 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -232,6 +232,27 @@ static inline void sample_cputime_atomic(struct task_cputime *times, times->sum_exec_runtime = atomic64_read(&atomic_times->sum_exec_runtime); } +/** + * thread_group_sample_cputime - Sample cputime for a given task + * @tsk: Task for which cputime needs to be started + * @iimes: Storage for time samples + * + * Called from sys_getitimer() to calculate the expiry time of an active + * timer. That means group cputime accounting is already active. Called + * with task sighand lock held. + * + * Updates @times with an uptodate sample of the thread group cputimes. + */ +void thread_group_sample_cputime(struct task_struct *tsk, + struct task_cputime *times) +{ + struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; + + WARN_ON_ONCE(!cputimer->running); + + sample_cputime_atomic(times, &cputimer->cputime_atomic); +} + void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times) { struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; |