From fe8e5677370bf792c2ae3b7e3aae46ddf9860fb2 Mon Sep 17 00:00:00 2001 From: Justin TerAvest Date: Sun, 10 Jul 2011 22:09:19 +0200 Subject: [PATCH] cfq: Remove special treatment for metadata rqs. There is no consistency among filesystems from what bios (or requests) are marked as being metadata. It's interesting to expose this in traces, but we shouldn't schedule the requests differently based on whether or not they're marked as being metadata. Signed-off-by: Justin TerAvest Signed-off-by: Jens Axboe --- block/cfq-iosched.c | 18 ------------------ 1 file changed, 18 deletions(-) diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index b2e1c75e4fbe2..762bd509b71b4 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -129,8 +129,6 @@ struct cfq_queue { unsigned long slice_end; long slice_resid; - /* pending metadata requests */ - int meta_pending; /* number of requests that are on the dispatch list or inside driver */ int dispatched; @@ -670,9 +668,6 @@ cfq_choose_req(struct cfq_data *cfqd, struct request *rq1, struct request *rq2, if (rq_is_sync(rq1) != rq_is_sync(rq2)) return rq_is_sync(rq1) ? rq1 : rq2; - if ((rq1->cmd_flags ^ rq2->cmd_flags) & REQ_META) - return rq1->cmd_flags & REQ_META ? rq1 : rq2; - s1 = blk_rq_pos(rq1); s2 = blk_rq_pos(rq2); @@ -1593,10 +1588,6 @@ static void cfq_remove_request(struct request *rq) cfqq->cfqd->rq_queued--; cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq), rq_is_sync(rq)); - if (rq->cmd_flags & REQ_META) { - WARN_ON(!cfqq->meta_pending); - cfqq->meta_pending--; - } } static int cfq_merge(struct request_queue *q, struct request **req, @@ -3334,13 +3325,6 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq, RB_EMPTY_ROOT(&cfqq->sort_list)) return true; - /* - * So both queues are sync. Let the new request get disk time if - * it's a metadata request and the current queue is doing regular IO. - */ - if ((rq->cmd_flags & REQ_META) && !cfqq->meta_pending) - return true; - /* * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice. */ @@ -3405,8 +3389,6 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, struct cfq_io_context *cic = RQ_CIC(rq); cfqd->rq_queued++; - if (rq->cmd_flags & REQ_META) - cfqq->meta_pending++; cfq_update_io_thinktime(cfqd, cic); cfq_update_io_seektime(cfqd, cfqq, rq); -- 2.39.5