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#!/usr/bin/env bpftrace
/*
* mdflush Trace md flush events.
* For Linux, uses bpftrace and eBPF.
*
* USAGE: mdflush.bt
*
* This is a bpftrace version of the bcc tool of the same name.
*
* For Linux 5.12+ (see tools/old for script for lower versions).
*
* Copyright 2018 Netflix, Inc.
* Licensed under the Apache License, Version 2.0 (the "License")
*
* 08-Sep-2018 Brendan Gregg Created this.
*/
#ifndef BPFTRACE_HAVE_BTF
#include <linux/blkdev.h>
#include <linux/bio.h>
#endif
BEGIN
{
printf("Tracing md flush events... Hit Ctrl-C to end.\n");
printf("%-8s %-6s %-16s %s\n", "TIME", "PID", "COMM", "DEVICE");
}
kprobe:md_flush_request
{
time("%H:%M:%S ");
printf("%-6d %-16s %s\n", pid, comm,
((struct bio *)arg1)->bi_bdev->bd_disk->disk_name);
}