函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\bfq-iosched.c Create Date:2022-07-27 19:32:23
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：bfq_update_wr_data

函数原型：static void bfq_update_wr_data(struct bfq_data *bfqd, struct bfq_queue *bfqq)

返回类型：void

参数：

类型参数名称
struct bfq_data *bfqd
struct bfq_queue *bfqq
4540  entity等于ity representing this queue in the scheduler
4542  如果actor by which the weight of this queue is multiplied 大于1则
4543  bfq_log_bfqq(bfqd, bfqq, "raising period dur %u/%u msec, old coeff %u, w %d(%d)", Convert jiffies to milliseconds and back.* Avoid unnecessary multiplications/divisions in the* two most common HZ cases:, Convert jiffies to milliseconds and back.* Avoid unnecessary multiplications/divisions in the* two most common HZ cases:, actor by which the weight of this queue is multiplied , weight of the queue , original weight, used to implement weight boosting )
4550  如果 flag, set to request a weight, ioprio or ioprio_class change 则bfq_log_bfqq(bfqd, bfqq, "WARN: pending prio change")
4558  如果bfq_bfqq_in_large_burst(bfqq)则Must be called with bfqq != NULL
4560  否则如果ime_is_before_jiffies(a) return true if a is before jiffies (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. + current maximum weight-raising time for this queue )则
4562  如果current maximum weight-raising time for this queue 不等于 Maximum weight-raising duration for soft real-time processes 或ime_is_before_jiffies(a) return true if a is before jiffies (Value of wr start time when switching to soft rt + bfq_wr_duration(bfqd))则Must be called with bfqq != NULL
4566  否则
4571  如果actor by which the weight of this queue is multiplied 大于1且current maximum weight-raising time for this queue 不等于 Maximum weight-raising duration for soft real-time processes 且Cumulative service received from the @bfq_queue since its* last transition to weight-raised state.大于BFQ uses the above-detailed, time-based weight-raising mechanism to* privilege interactive tasks. This mechanism is vulnerable to the* following false positives: I/O-bound applications that will go on* doing I/O for much longer than the duration of weight则
4575  Must be called with bfqq != NULL
4586  如果 weight of the queue 大于 original weight, used to implement weight boosting 不等于actor by which the weight of this queue is multiplied 大于1则Update weight and priority of entity
调用者
名称描述
bfq_dispatch_rq_from_bfqqDispatch next request from bfqq.