blktrace: add FLUSH/FUA support
authorNamhyung Kim <namhyung@gmail.com>
Thu, 11 Aug 2011 08:36:05 +0000 (10:36 +0200)
committerJens Axboe <jaxboe@fusionio.com>
Thu, 11 Aug 2011 08:36:05 +0000 (10:36 +0200)
commitc09c47caedc9854d59378d6e34c989e51cfdd2b4
treead7de20c08092cdf1cbbb83625a76acab3b0e2ce
parent8e4bf84474960e832b56293c9b0674c88b5b05ce
blktrace: add FLUSH/FUA support

Add FLUSH/FUA support to blktrace. As FLUSH precedes WRITE and/or
FUA follows WRITE, use the same 'F' flag for both cases and
distinguish them by their (relative) position. The end results
look like (other flags might be shown also):

 - WRITE:            W
 - WRITE_FLUSH:      FW
 - WRITE_FUA:        WF
 - WRITE_FLUSH_FUA:  FWF

Note that we reuse TC_BARRIER due to lack of bit space of act_mask
so that the older versions of blktrace tools will report flush
requests as barriers from now on.

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
include/linux/blktrace_api.h
include/trace/events/block.h
kernel/trace/blktrace.c