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#!/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);
}