diff options
Diffstat (limited to 'block/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 15f7238f527f..a5de31f76d3b 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -172,6 +172,7 @@ struct cfq_data { enum wl_prio_t serving_prio; enum wl_type_t serving_type; unsigned long workload_expires; + bool noidle_tree_requires_idle; /* * Each priority tree is sorted by next_request position. These @@ -1253,9 +1254,9 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd) return; /* - * still requests with the driver, don't idle + * still active requests from this queue, don't idle */ - if (rq_in_driver(cfqd)) + if (cfqq->dispatched) return; /* @@ -1478,6 +1479,7 @@ static void choose_service_tree(struct cfq_data *cfqd) slice = max_t(unsigned, slice, CFQ_MIN_TT); cfqd->workload_expires = jiffies + slice; + cfqd->noidle_tree_requires_idle = false; } /* @@ -2597,17 +2599,27 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq) cfq_clear_cfqq_slice_new(cfqq); } /* - * If there are no requests waiting in this queue, and - * there are other queues ready to issue requests, AND - * those other queues are issuing requests within our - * mean seek distance, give them a chance to run instead - * of idling. + * Idling is not enabled on: + * - expired queues + * - idle-priority queues + * - async queues + * - queues with still some requests queued + * - when there is a close cooperator */ if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq)) cfq_slice_expired(cfqd, 1); - else if (cfqq_empty && !cfq_close_cooperator(cfqd, cfqq) && - sync && !rq_noidle(rq)) - cfq_arm_slice_timer(cfqd); + else if (sync && cfqq_empty && + !cfq_close_cooperator(cfqd, cfqq)) { + cfqd->noidle_tree_requires_idle |= !rq_noidle(rq); + /* + * Idling is enabled for SYNC_WORKLOAD. + * SYNC_NOIDLE_WORKLOAD idles at the end of the tree + * only if we processed at least one !rq_noidle request + */ + if (cfqd->serving_type == SYNC_WORKLOAD + || cfqd->noidle_tree_requires_idle) + cfq_arm_slice_timer(cfqd); + } } if (!rq_in_driver(cfqd)) |