Also, a patch set providing an ftrace interface to blktrace was recently submitted to the LKML (http://marc.info/?t=123212992300002&r=1&w=2). This could come in handy in further debugging.
Also, a patch set providing an ftrace interface to blktrace was recently submitted to the LKML (http:// marc.info/ ?t=123212992300 002&r=1& w=2). This could come in handy in further debugging.