From: Arianna Avanzini <avanzini.aria...@gmail.com>
CFQ implements a request-triggered queue preemption, based on the
priority class of the queues, and aimed at reducing latencies. There
is no such preemption in BFQ, where a low latency is guaranteed only
by the overall request-scheduling policy.
Signed-off-by: Arianna Avanzini <avanzini.aria...@gmail.com>
Signed-off-by: Paolo Valente <paolo.vale...@linaro.org>
---
block/cfq-iosched.c | 99 +----------------------------------------------------
1 file changed, 1 insertion(+), 98 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index fab01e2..174dc94 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1069,8 +1069,7 @@ static inline void cfq_slice_expired(struct cfq_data
*cfqd, bool timed_out)
}
/*
- * Get next queue for service. Unless we have a queue preemption,
- * we'll simply select the first cfqq in the service tree.
+ * Get next queue for service.
*/
static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd)
{
@@ -1929,93 +1928,6 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct
cfq_queue *cfqq,
}
/*
- * Check if new_cfqq should preempt the currently active queue. Return 0 for
- * no or if we aren't sure, a 1 will cause a preempt.
- */
-static bool
-cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
- struct request *rq)
-{
- struct cfq_queue *cfqq;
-
- cfqq = cfqd->active_queue;
- if (!cfqq)
- return false;
-
- if (cfq_class_idle(new_cfqq))
- return false;
-
- if (cfq_class_idle(cfqq))
- return true;
-
- /*
- * Don't allow a non-RT request to preempt an ongoing RT cfqq timeslice.
- */
- if (cfq_class_rt(cfqq) && !cfq_class_rt(new_cfqq))
- return false;
-
- /*
- * if the new request is sync, but the currently running queue is
- * not, let the sync request have priority.
- */
- if (rq_is_sync(rq) && !cfq_cfqq_sync(cfqq))
- return true;
-
- if (cfq_slice_used(cfqq))
- return true;
-
- /*
- * Allow an RT request to pre-empt an ongoing non-RT cfqq timeslice.
- */
- if (cfq_class_rt(new_cfqq) && !cfq_class_rt(cfqq))
- return true;
-
- WARN_ON_ONCE(cfqq->ioprio_class != new_cfqq->ioprio_class);
- /* Allow preemption only if we are idling on sync-noidle tree */
- if (cfqd->serving_wl_type == SYNC_NOIDLE_WORKLOAD &&
- cfqq_type(new_cfqq) == SYNC_NOIDLE_WORKLOAD &&
- 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_PRIO) && !cfqq->prio_pending)
- return true;
-
- /* An idle queue should not be idle now for some reason */
- if (RB_EMPTY_ROOT(&cfqq->sort_list) && !cfq_should_idle(cfqd, cfqq))
- return true;
-
- if (!cfqd->active_cic || !cfq_cfqq_wait_request(cfqq))
- return false;
-
- return false;
-}
-
-/*
- * cfqq preempts the active queue. if we allowed preempt with no slice left,
- * let it have half of its nominal slice.
- */
-static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
-{
- cfq_log_cfqq(cfqd, cfqq, "preempt");
- cfq_slice_expired(cfqd, 1);
-
- /*
- * Put the new queue at the front of the of the current list,
- * so we know that it will be selected next.
- */
- BUG_ON(!cfq_cfqq_on_rr(cfqq));
-
- cfq_service_tree_add(cfqd, cfqq, 1);
-
- cfqq->slice_end = 0;
- cfq_mark_cfqq_slice_new(cfqq);
-}
-
-/*
* Called when a new fs request (rq) is added (to cfqq). Check if there's
* something we should do about it
*/
@@ -2055,15 +1967,6 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue
*cfqq,
} else
cfq_mark_cfqq_must_dispatch(cfqq);
}
- } else if (cfq_should_preempt(cfqd, cfqq, rq)) {
- /*
- * not the active queue - expire current slice if it is
- * idle and has expired it's mean thinktime or this new queue
- * has some old slice time left and is of higher priority or
- * this new queue is RT and the current one is BE
- */
- cfq_preempt_queue(cfqd, cfqq);
- __blk_run_queue(cfqd->queue);
}
}
--
1.9.1
