#!/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"); } tracepoint:block:block_bio_queue { @start[args.sector] = nsecs; } tracepoint:block:block_rq_complete, tracepoint:block:block_bio_complete /@start[args.sector]/ { @usecs = hist((nsecs - @start[args.sector]) / 1000); delete(@start[args.sector]); } END { clear(@start); }