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| author | Shaohua Li <shaohua.li@intel.com> | 2010-11-09 14:51:13 +0100 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-11-09 14:51:13 +0100 |
| commit | 2b9408a45978dcda77407859148deeccf403c372 (patch) | |
| tree | 52fc549e7cc879c6dea98554f75da24df31c07cf /block/cfq-iosched.c | |
| parent | 8e1ac6655104bc6e1e79d67e2df88cc8fa9b6e07 (diff) | |
| download | linux-3.10-2b9408a45978dcda77407859148deeccf403c372.tar.gz linux-3.10-2b9408a45978dcda77407859148deeccf403c372.tar.bz2 linux-3.10-2b9408a45978dcda77407859148deeccf403c372.zip | |
cfq-iosched: don't schedule a dispatch for a non-idle queue
Vivek suggests we don't need schedule a dispatch when an idle queue
becomes nonidle. And he is right, cfq_should_preempt already covers
the logic.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 19 |
1 files changed, 1 insertions, 18 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index ca4d1990724..f90519430be 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -3523,25 +3523,8 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq) } } - if (!cfqd->rq_in_driver) { + if (!cfqd->rq_in_driver) cfq_schedule_dispatch(cfqd); - return; - } - /* - * A queue is idle at cfq_dispatch_requests(), but it gets noidle - * later. We schedule a dispatch if the queue has no requests, - * otherwise the disk is actually in idle till all requests - * are finished even cfq_arm_slice_timer doesn't make the queue idle - * */ - cfqq = cfqd->active_queue; - if (!cfqq) - return; - - if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq) && - (!cfqd->cfq_group_idle || cfqq->cfqg->nr_cfqq > 1)) { - cfq_del_timer(cfqd, cfqq); - cfq_schedule_dispatch(cfqd); - } } /* |