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. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
