函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\events\hw_breakpoint.c Create Date:2022-07-27 15:04:34
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Report the number of pinned/un-pinned breakpoints we have in* a given cpu (cpu > -1) or in all of them (cpu = -1).

函数原型：static void fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp, enum bp_type_idx type)

返回类型：void

参数：

类型参数名称
struct bp_busy_slots *slots
struct perf_event *bp
enum bp_type_idxtype
136  cpumask等于cpumask_of_bp(bp)
140  info等于get_bp_info(cpu, type)
143  nr等于Number of pinned cpu breakpoints in a cpu
144  如果非target则nr加等于Report the maximum number of pinned breakpoints a task* have in this cpu
146  否则nr加等于Count the number of breakpoints of the same type and same task.* The given event must be not on the list.
149  如果nr大于pinned则pinned等于nr
152  nr等于XXX: placeholder, see fetch_this_slot()
153  如果nr大于flexible则flexible等于nr
调用者
名称描述
__reserve_bp_slotConstraints to check before allowing this new breakpoint counter:* == Non-pinned counter == (Considered as pinned for now)* - If attached to a single cpu, check:* (per_cpu(info->flexible, cpu) || (per_cpu(info->cpu_pinned, cpu)* +