Re: Why fio triggers reading of device serial number

[Asias He <asias@xxxxxxxxxx>]

On 05/18/2012 06:00 PM, Jens Axboe wrote:
> On 05/18/2012 08:28 AM, Asias He wrote:
> > Hi, List
> >
> > I noticed that fio triggers reading of device serial number when fio
> > starts (one read) and stops (lots of read). I was wondering if fio was
> > reading the sysfs attribute directly in fio's code,
> > e.g./sys/block/vda/serial, or it triggered something which make udevd to
> > read it.
> >
> > trace-cmd shows it seems udevd is reading:
> >
> > udevd-6856  [006] xxx: function:    dev_attr_show
> > udevd-6856  [006] xxx: function:        virtblk_serial_show
> >
> > Any ideas? Thanks.
>
> Probably mtime changing of the special file inode, causing some udev
> rule to attempt to re-read the id/serial. Fio doesn't read the serial
> number.

OK. Thanks, Jens.

--
Asias
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