iowatcher: Handle cgroup information

Since Linux kernel commit 35fe6d763229 "block: use standard blktrace API
to output cgroup info for debug notes" the kernel can pass
__BLK_TA_CGROUP flag in the action field of generated events. Teach
iowatcher to ignore this information.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed