bfq_better_to_idle

Name:For a queue that becomes empty, device idling is allowed only if* this function returns true for that queue

Proto:static bool bfq_better_to_idle(struct bfq_queue *bfqq)

Type:bool

Parameter:

Type	Parameter	Name
struct bfq_queue *	bfqq

4182

bfqd = parent bfq_data

4186

If Value for the false possibility is greater at compile time(!bfqq_process_refs(bfqq)) Then Return false

4189

If Value for the false possibility is greater at compile time(* Force device idling whenever needed to provide accurate * service guarantees, without caring about throughput * issues. CAVEAT: this may even increase latencies, in case * of useless idling for processes that did stop doing I/O.) Then Return true

4200

If maximum idling time == 0 || Not bfq_bfqq_sync(bfqq) || bfq_class_idle(bfqq) Then Return false

4204

idling_boosts_thr_with_no_issue = idling_boosts_thr_without_issues(bfqd, bfqq)

4207

idling_needed_for_service_guar = There is a case where idling does not have to be performed for* throughput concerns, but to preserve the throughput share of* the process associated with bfqq

4216

Return idling_boosts_thr_with_no_issue || idling_needed_for_service_guar

**Caller**
Name	Describe
bfq_bfqq_must_idle	If the in-service queue is empty but the function bfq_better_to_idle* returns true, then:* 1) the queue must remain in service and cannot be expired, and* 2) the device must be idled to wait for the possible arrival of a new* request for the queue
bfq_select_queue	Select a queue for service. If we have a current queue in service,* check whether to continue servicing it, or retrieve and set a new one.
bfq_completed_request

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