#!/usr/bin/env bpftrace /* * biolatency.bt Block I/O latency as a histogram. * For Linux, uses bpftrace, eBPF. * * This is a bpftrace version of the bcc tool of the same name. * * Copyright 2018 Netflix, Inc. * Licensed under the Apache License, Version 2.0 (the "License") * * 13-Sep-2018 Brendan Gregg Created this. */ BEGIN { printf("Tracing block device I/O... Hit Ctrl-C to end.\n"); } kprobe:blk_account_io_start, kprobe:__blk_account_io_start { @start[arg0] = nsecs; } kprobe:blk_account_io_done, kprobe:__blk_account_io_done /@start[arg0]/ { @usecs = hist((nsecs - @start[arg0]) / 1000); delete(@start[arg0]); } END { clear(@start); }