1#@!#!123s

D7net
: / sbin /
Filename : biolatency.bt
back
#!/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.
//
// 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);
}