Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\events\hw_breakpoint.c Create Date:2022-07-28 13:43:34
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Name:Report the number of pinned/un-pinned breakpoints we have in* a given cpu (cpu > -1) or in all of them (cpu = -1).

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

Type:void

Parameter:

TypeParameterName
struct bp_busy_slots *slots
struct perf_event *bp
enum bp_type_idxtype
136  cpumask = cpumask_of_bp(bp)
140  info = get_bp_info(cpu, type)
143  nr = Number of pinned cpu breakpoints in a cpu
144  If Not target Then nr += Report the maximum number of pinned breakpoints a task* have in this cpu
146  Else nr += Count the number of breakpoints of the same type and same task.* The given event must be not on the list.
149  If nr > pinned Then pinned = nr
152  nr = XXX: placeholder, see fetch_this_slot()
153  If nr > flexible Then flexible = nr
Caller
NameDescribe
__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)* +