As a follow-up to earlier discussions about adding statistics to the SCSI layer (http://lkml.org/lkml/2006/9/26/151), i am looking what data blktrace can provide. One problem is that blktrace currently can only get the trace data from block device files. This excludes retrieving trace data from other SCSI devices, especially from tape drives. Looking at the code, the SCSI layer internally uses the same request_queue per device. It looks like the blktrace ioctls as interface to userspace are the first thing that is missing. Is this all? What would be a going idea to make the blktrace ioctls available for all SCSI devices? My first approach would be to add them to the sg devices. Any comments? If there are now objections, i will try to implement the ioctls for sg devices, to see if this actually works. -- Christof Schmitt - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
