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#!/usr/bin/env bpftrace
/*
* biosnoop.bt Block I/O tracing tool, showing per I/O latency.
* For Linux, uses bpftrace, eBPF.
*
* TODO: switch to block tracepoints. Add offset and size columns.
*
* This is a bpftrace version of the bcc tool of the same name.
*
* 15-Nov-2017 Brendan Gregg Created this.
*/
#ifndef BPFTRACE_HAVE_BTF
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#endif
BEGIN
{
printf("%-12s %-7s %-16s %-6s %7s\n", "TIME(ms)", "DISK", "COMM", "PID", "LAT(ms)");
}
kprobe:blk_account_io_start,
kprobe:__blk_account_io_start
{
@start[arg0] = nsecs;
@iopid[arg0] = pid;
@iocomm[arg0] = comm;
@disk[arg0] = ((struct request *)arg0)->q->disk->disk_name;
}
kprobe:blk_account_io_done,
kprobe:__blk_account_io_done
/@start[arg0] != 0 && @iopid[arg0] != 0 && @iocomm[arg0] != ""/
{
$now = nsecs;
printf("%-12u %-7s %-16s %-6d %7d\n",
elapsed / 1e6, @disk[arg0], @iocomm[arg0], @iopid[arg0],
($now - @start[arg0]) / 1e6);
delete(@start[arg0]);
delete(@iopid[arg0]);
delete(@iocomm[arg0]);
delete(@disk[arg0]);
}
END
{
clear(@start);
clear(@iopid);
clear(@iocomm);
clear(@disk);
}
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