#!/usr/bin/env bpftrace
/*
* xfsdist Summarize XFS operation latency.
* For Linux, uses bpftrace and eBPF.
*
* This traces four common file system calls: read, write, open, and fsync.
* It can be customized to trace more if desired.
*
* USAGE: xfsdist.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")
*
* 08-Sep-2018 Brendan Gregg Created this.
*/
BEGIN
{
printf("Tracing XFS operation latency... Hit Ctrl-C to end.\n");
}
kprobe:xfs_file_read_iter,
kprobe:xfs_file_write_iter,
kprobe:xfs_file_open,
kprobe:xfs_file_fsync
{
@start[tid] = nsecs;
@name[tid] = func;
}
kretprobe:xfs_file_read_iter,
kretprobe:xfs_file_write_iter,
kretprobe:xfs_file_open,
kretprobe:xfs_file_fsync
/@start[tid]/
{
@us[@name[tid]] = hist((nsecs - @start[tid]) / 1000);
delete(@start[tid]);
delete(@name[tid]);
}
END
{
clear(@start);
clear(@name);
}
Mini Shell