On Mon, 2017-04-24 at 17:35 -0400, Martin K. Petersen wrote: > > Show the SCSI CDB, .eh_eflags and .result for pending SCSI commands > > in /sys/kernel/debug/block/*/mq/*/dispatch and */rq_list. > > Why not use SCSI tracing if you are interested in these?
Hello Martin, SCSI tracing has to be enabled before a test is started, produces a huge amount of data, and deriving state information from a huge trace is far from easy. The information in debugfs provides an easy to read overview of the current state without having to analyze megabytes of traces, without introducing any slowdown and without having to enable any tracing mechanism from beforehand. Bart.
