tree c876b93785ee3b25c341be0dd5080a5176f27736
parent 9a79b2274186fade17134929d4f85b70d59a3840
author Vasily Tarasov <vtaras@openvz.org> 1184918798 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1184918798 +0200

cfq: async queue allocation per priority

If we have two processes with different ioprio_class, but the same
ioprio_data, their async requests will fall into the same queue. I guess
such behavior is not expected, because it's not right to put real-time
requests and best-effort requests in the same queue.

The attached patch fixes the problem by introducing additional *cfqq
fields on cfqd, pointing to per-(class,priority) async queues.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>