bpfstack

Documentation

Overview

Package bpfstack parses the raw layout produced by BPF_MAP_TYPE_STACK_TRACE: a fixed 127-slot buffer of little-endian u64 instruction pointers, terminated by a zero slot. Shared between profile/ (CPU sampling) and offcpu/ (sched_switch tracking).

Index

• Constants
• func ExtractIPs(stack []byte) []uint64

Constants

const MaxFrames = 127

MaxFrames is the depth of a BPF stackmap entry. Matches the BPF PERF_MAX_STACK_DEPTH macro in bpf/perf.bpf.c and bpf/offcpu.bpf.c.

Functions

func ExtractIPs

func ExtractIPs(stack []byte) []uint64

ExtractIPs decodes a BPF stackmap entry into a slice of instruction pointers, stopping at the first zero slot. Buffers shorter than MaxFrames*8 bytes are processed up to their length; buffers longer are truncated at MaxFrames.