When using DTrace to track I/Os to disks under the sd/ssd driver, it's easy
enough to get the major/minor device number of the disk being targeted for I/O:
fbt:ssd:ssdstrategy:entry,
fbt:sd:sdstrategy:entry
{
io_start[(struct buf *)arg0] = timestamp;
}
fbt:ssd:ssdintr:entry,
fbt:sd:sdintr:entry
/ io_start[(this->buf = (struct buf *)((struct scsi_pkt *)arg0)->pkt_private)]
!= 0 /
{
this->un = ((struct sd_xbuf *) this->buf->b_private)->xb_un;
this->major = getmajor(this->buf->b_edev);
this->minor = getminor(this->buf->b_edev);
@max_ms[this->major, this->minor] =
max((timestamp - io_start[this->buf])/1000000); /* convert ns to ms */
io_start[this->buf] = 0;
}
We can even get device names in the form of 'ssdXXX', which unfortunately
aren't that helpful.
How can we map major/minor numbers or device names to their /dev/[r]dsk/...
symlinks in DTrace? That would make the output more intuitive, at least to us.
Gordon Marler
[EMAIL PROTECTED]
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