函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\events\core.c Create Date:2022-07-27 14:50:27
Last Modify:2022-05-20 07:50:19 Copyright©Brick
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函数名称：__perf_update_times

函数原型：static __always_inline void __perf_update_times(struct perf_event *event, u64 now, u64 *enabled, u64 *running)

返回类型：void

参数：

类型参数名称
struct perf_event *event
u64now
u64 *enabled
u64 *running
622  state等于State based event timekeeping...* The basic idea is to use event->state to determine which (if any) time* fields to increment with the current delta. This means we only need to* update timestamps when we change state or when they are explicitly requested
623  delta等于now减tstamp
625  enabled等于total_time_enabled
626  如果state大于等于PERF_EVENT_STATE_INACTIVE则enabled加等于delta
629  running等于total_time_running
630  如果state大于等于PERF_EVENT_STATE_ACTIVE则running加等于delta
调用者
名称描述
perf_event_update_time
perf_event_read_localNMI-safe method to read a local event, that is an event that* is:* - either for the current task, or for this CPU* - does not have inherit set, for inherited task events* will not be local and we cannot read them atomically* - must not have a pmu::count
calc_timer_values