bfq_bfqq_save_state

Name:bfq_bfqq_save_state

Proto:static void bfq_bfqq_save_state(struct bfq_queue *bfqq)

Type:void

Parameter:

Type	Parameter	Name
struct bfq_queue *	bfqq

2679

bic = Pointer to the bfq_io_cq owning the bfq_queue, set to %NULL* if the queue is shared.

2686

If Not bic Then Return

2689

* Save the weight when a merge occurs, to be able * to restore it in case of split. If the weight is not * correctly resumed when the queue is recycled, * then the weight of the recycled queue could differ * from the weight of the original queue. = original weight, used to implement weight boosting

2690

saved_ttime = associated @bfq_ttime struct

2691

* Snapshot of the has_short_time flag before merging; taken * to remember its value while the queue is merged, so as to * be able to restore it in case of split. = bfq_bfqq_has_short_ttime(bfqq)

2692

* Same purpose as the previous two fields for the I/O bound * classification of a queue. = bfq_bfqq_IO_bound(bfqq)

2693

* Same purpose as the previous fields for the value of the * field keeping the queue's belonging to a large burst = bfq_bfqq_in_large_burst(bfqq)

2694

* True if the queue belonged to a burst list before its merge * with another cooperating queue. = Not hlist_unhashed( & de for the device's burst list )

2695

If Value for the false possibility is greater at compile time(bfq_bfqq_just_created(bfqq) && !bfq_bfqq_in_large_burst(bfqq) && if set to true, low-latency heuristics are enabled ) Then

2707

* Similar to previous fields: save wr information. = * Maximum factor by which the weight of a weight-raised queue * is multiplied.

2708

saved_wr_start_at_switch_to_srt = Return the farthest past time instant according to jiffies* macros.

2709

saved_wr_cur_max_time = bfq_wr_duration(parent bfq_data )

2710

saved_last_wr_start_finish = jiffies

2711

Else

2712

* Similar to previous fields: save wr information. = actor by which the weight of this queue is multiplied

2713

saved_wr_start_at_switch_to_srt = Value of wr start time when switching to soft rt

2715

saved_last_wr_start_finish = Start time of the current weight-raising period if* the @bfq-queue is being weight-raised, otherwise* finish time of the last weight-raising period.

2716

saved_wr_cur_max_time = current maximum weight-raising time for this queue

**Caller**
Name	Describe
bfq_merge_bfqqs

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