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#!/usr/bin/env bpftrace
/*
 * bitesize	Show disk I/O size as a histogram.
 *		For Linux, uses bpftrace and eBPF.
 *
 * USAGE: bitesize.bt
 *
 * 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")
 *
 * 07-Sep-2018	Brendan Gregg	Created this.
 */

BEGIN
{
	printf("Tracing block device I/O... Hit Ctrl-C to end.\n");
}

tracepoint:block:block_rq_issue
{
	@[args.comm] = hist(args.bytes);
}

END
{
	printf("\nI/O size (bytes) histograms by process name:");
}