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 14:53:16
Last Modify:2022-05-20 07:50:19 Copyright©Brick
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函数名称：perf_rotate_context

函数原型：static bool perf_rotate_context(struct perf_cpu_context *cpuctx)

返回类型：bool

参数：

类型参数名称
struct perf_cpu_context *cpuctx
3849  struct perf_event * cpu_event = NULL, * task_event = NULL
3850  struct perf_event_context * task_ctx = NULL
3858  cpu_rotate等于Set when nr_events != nr_active, except tolerant to events not* necessary to be active due to scheduling constraints, such as cgroups.
3859  task_ctx等于task_ctx
3860  task_rotate等于如果task_ctx则Set when nr_events != nr_active, except tolerant to events not* necessary to be active due to scheduling constraints, such as cgroups.否则0
3862  如果非cpu_rotate或task_rotate的值则返回:false
3865  perf_ctx_lock(cpuctx, task_ctx)
3866  perf_pmu_disable(pmu)
3868  如果task_rotate则task_event等于pick an event from the flexible_groups to rotate
3870  如果cpu_rotate则cpu_event等于pick an event from the flexible_groups to rotate
3877  如果task_event或task_ctx且cpu_event则ctx_sched_out(task_ctx, cpuctx, EVENT_FLEXIBLE)
3879  如果cpu_event则cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE)
3882  如果task_event则Move @event to the tail of the @ctx's elegible events.
3884  如果cpu_event则Move @event to the tail of the @ctx's elegible events.
3887  perf_event_sched_in(cpuctx, task_ctx, 当前进程)
3889  perf_pmu_enable(pmu)
3890  perf_ctx_unlock(cpuctx, task_ctx)
3892  返回:true
调用者
名称描述
perf_mux_hrtimer_handler must be called with interrupts disabled