函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\time\posix-cpu-timers.c Create Date:2022-07-27 11:47:23
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Sample a per-thread clock for the given task. clkid is validated.

函数原型：static u64 cpu_clock_sample(const clockid_t clkid, struct task_struct *p)

返回类型：u64

参数：

类型参数名称
const clockid_tclkid
struct task_struct *p
201  如果clkid恒等于CPUCLOCK_SCHED则返回:Return accounted runtime for the task.* In case the task is currently running, return the runtime plus current's* pending runtime that have not been accounted yet.
204  task_cputime(p, & utime, & stime)
207  当:clkid恒等于CPUCLOCK_PROF
208  返回:utime加stime
209  当:clkid恒等于CPUCLOCK_VIRT
210  返回:utime
211  默认
212  WARN_ON_ONCE(1)
214  返回:0
调用者
名称描述
posix_cpu_clock_get
posix_cpu_timer_setGuts of sys_timer_settime for CPU timers.* This is called with the timer locked and interrupts disabled.* If we return TIMER_RETRY, it's necessary to release the timer's lock* and try again. (This happens when the timer is in the middle of firing.)
posix_cpu_timer_get
posix_cpu_timer_rearm