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| author | Jens Axboe <jens.axboe@oracle.com> | 2009-11-30 09:38:13 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-11-30 09:38:13 +0100 |
| commit | 464191c65b85a8ec68a6e1a6293af625287c807e (patch) | |
| tree | 4d4b91a3a4ce2faeb63758b119f0fb229fcc57ea /block/cfq-iosched.c | |
| parent | 8e550632cccae34e265cb066691945515eaa7fb5 (diff) | |
| download | lwn-464191c65b85a8ec68a6e1a6293af625287c807e.tar.gz lwn-464191c65b85a8ec68a6e1a6293af625287c807e.zip | |
Revert "cfq: Make use of service count to estimate the rb_key offset"
This reverts commit 3586e917f2c7df769d173c4ec99554cb40a911e5.
Corrado Zoccolo <czoccolo@gmail.com> 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 <jens.axboe@oracle.com>
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 8 |
1 files changed, 2 insertions, 6 deletions
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)); } /* |