blktrace: Send BLK_TN_PROCESS events to all running traces
authorJan Kara <jack@suse.cz>
Tue, 17 Sep 2013 20:30:31 +0000 (22:30 +0200)
committerJens Axboe <axboe@kernel.dk>
Fri, 8 Nov 2013 15:59:00 +0000 (08:59 -0700)
commita404d5576bbe586a1097a8bc2f32c5f22651b0aa
tree011e6b1f5862a55485a9b9b32f19001c0b65e803
parent5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52
blktrace: Send BLK_TN_PROCESS events to all running traces

Currently each task sends BLK_TN_PROCESS event to the first traced
device it interacts with after a new trace is started. When there are
several traced devices and the task accesses more devices, this logic
can result in BLK_TN_PROCESS being sent several times to some devices
while it is never sent to other devices. Thus blkparse doesn't display
command name when parsing some blktrace files.

Fix the problem by sending BLK_TN_PROCESS event to all traced devices
when a task interacts with any of them.

Signed-off-by: Jan Kara <jack@suse.cz>
Review-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
include/linux/blktrace_api.h
kernel/trace/blktrace.c