函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\bfq-wf2q.c Create Date:2022-07-27 19:35:19
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Update weight and priority of entity

函数原型：struct bfq_service_tree *__bfq_entity_update_weight_prio(struct bfq_service_tree *old_st, struct bfq_entity *entity, bool update_class_too)

返回类型：struct bfq_service_tree

参数：

类型参数名称
struct bfq_service_tree *old_st
struct bfq_entity *entity
boolupdate_class_too
733  new_st等于old_st
735  如果 flag, set to request a weight, ioprio or ioprio_class change 则
736  bfqq等于bfq_entity_to_bfqq(entity)
738  struct bfq_data * bfqd = NULL
745  如果bfqq则bfqd等于parent bfq_data
756  smp_rmb()
757  scheduler weight sum; active and idle entities contribute to it 减等于 weight of the queue
759  如果 next weight if a change is in progress 不等于 original weight, used to implement weight boosting 则
760  如果 next weight if a change is in progress 小于BFQ_MIN_WEIGHT或 next weight if a change is in progress 大于BFQ_MAX_WEIGHT则
769  original weight, used to implement weight boosting 等于 next weight if a change is in progress
770  如果bfqq则current ioprio and ioprio class 等于q_weight_to_ioprio - calc an ioprio from a weight.*@weight: the weight value to convert.* To preserve as much as possible the old only-ioprio user interface,* 0 is used as an escape ioprio value for weights (numerically) equal or
775  如果bfqq且update_class_too则current ioprio and ioprio class 等于xt ioprio and ioprio class if a change is in progress
782  如果非bfqq或current ioprio and ioprio class 恒等于xt ioprio and ioprio class if a change is in progress 则 flag, set to request a weight, ioprio or ioprio_class change 等于0
792  new_st等于bfq_entity_service_tree(entity)
794  prev_weight等于 weight of the queue
795  new_weight等于 original weight, used to implement weight boosting 乘如果bfqq则actor by which the weight of this queue is multiplied 否则1
802  如果prev_weight不等于new_weight且bfqq则
803  root等于* rbtree of weight counters of @bfq_queues, sorted by * weight. Used to keep track of whether all @bfq_queues have * the same weight. The tree contains one counter for each * distinct weight associated to some active and not * weight-raised @bfq_queue (see
804  Decrement the weight counter associated with the queue, and, if the* counter reaches 0, remove the counter from the tree.* See the comments to the function bfq_weights_tree_add() for considerations* about overhead.
806  weight of the queue 等于new_weight
811  如果prev_weight不等于new_weight且bfqq且actor by which the weight of this queue is multiplied 恒等于1则
813  If the weight-counter tree passed as input contains no counter for* the weight of the input queue, then add that counter; otherwise just* increment the existing counter.* Note that weight-counter trees contain few nodes in mostly symmetric* scenarios
816  scheduler weight sum; active and idle entities contribute to it 加等于 weight of the queue
818  如果new_st不等于old_st则 B-WF2Q+ start and finish timestamps [sectors/weight] 等于scheduler virtual time
822  返回:new_st
调用者
名称描述
bfq_update_fin_time_enqueue
bfq_update_wr_data