From 464191c65b85a8ec68a6e1a6293af625287c807e Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 30 Nov 2009 09:38:13 +0100 Subject: Revert "cfq: Make use of service count to estimate the rb_key offset" This reverts commit 3586e917f2c7df769d173c4ec99554cb40a911e5. Corrado Zoccolo correctly points out, that we need consistency of rb_key offset across groups. This means we cannot properly use the per-service_tree service count. Revert this change. Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'block/cfq-iosched.c') diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index a5de31f76d3b..71446497d7b6 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -609,15 +609,11 @@ cfq_find_next_rq(struct cfq_data *cfqd, struct cfq_queue *cfqq, static unsigned long cfq_slice_offset(struct cfq_data *cfqd, struct cfq_queue *cfqq) { - struct cfq_rb_root *service_tree; - - service_tree = service_tree_for(cfqq_prio(cfqq), cfqq_type(cfqq), cfqd); - /* * just an approximation, should be ok. */ - return service_tree->count * (cfq_prio_slice(cfqd, 1, 0) - - cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); + return (cfqd->busy_queues - 1) * (cfq_prio_slice(cfqd, 1, 0) - + cfq_prio_slice(cfqd, cfq_cfqq_sync(cfqq), cfqq->ioprio)); } /* -- cgit v1.2.2