bfq_bfqq_expire

函数名称：q_bfqq_expire - expire a queue.*@bfqd: device owning the queue.*@bfqq: the queue to expire.*@compensate: if true, compensate for the time spent idling.*@reason: the reason causing the expiration.* If the process associated with bfqq does slow I/O (e

函数原型：void bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq, bool compensate, enum bfqq_expiration reason)

返回类型：void

参数：

类型	参数	名称
struct bfq_data *	bfqd
struct bfq_queue *	bfqq
bool	compensate
enum bfqq_expiration	reason

3915

delta等于0

3916

entity等于ity representing this queue in the scheduler

3921

slow等于Return true if the process associated with bfqq is "slow". The slow* flag is used, in addition to the budget timeout, to reduce the* amount of service provided to seeky processes, and thus reduce* their chances to lower the throughput

3938

如果actor by which the weight of this queue is multiplied 恒等于1且slow或reason恒等于udget took too long to be used 且bfq_bfqq_budget_left(bfqq)大于等于 budget, used also to calculate F_i: F_i = S_i + @budget / @weight 除3的值则bfq_bfqq_charge_time(bfqd, bfqq, delta)

3944

如果reason恒等于queue has been idling for* too long且 amount of service received during the last service slot 小于等于2乘 budget, used also to calculate F_i: F_i = S_i + @budget / @weight 除10则bfq_clear_bfqq_IO_bound(bfqq)

3948

如果 if set to true, low-latency heuristics are enabled 且actor by which the weight of this queue is multiplied 恒等于1则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.等于jiffies

3951

如果 if set to true, low-latency heuristics are enabled 且 Max service-rate for a soft real-time queue, in sectors/sec 大于0且RB_EMPTY_ROOT( & sorted list of pending requests )则

3979

如果umber of requests on the dispatch list or inside driver 恒等于0且actor by which the weight of this queue is multiplied 不等于* Maximum factor by which the weight of a weight-raised queue * is multiplied.则Minimum time instant such that, only if a new request is* enqueued after this time instant in an idle @bfq_queue with* no outstanding requests, then the task associated with the* queue it is deemed as soft real-time (see the comments on* the function 等于To be deemed as soft real-time, an application must meet two* requirements

3983

否则如果umber of requests on the dispatch list or inside driver 大于0则

3988

bfq_mark_bfqq_softrt_update(bfqq)

3992

bfq_log_bfqq(bfqd, bfqq, "expire (%d, slow %d, num_disp %d, short_ttime %d)", reason, slow, umber of requests on the dispatch list or inside driver , bfq_bfqq_has_short_ttime(bfqq))

4001

* True if some request has been injected during the last service hole. = * Flag set to activate the sampling of the total service time * of a just-arrived first I/O request (see * bfq_update_inject_limit()). This will cause the setting of * waited_rq when the request is finally dispatched. = false

4002

* If set, then bfq_update_inject_limit() is invoked when * waited_rq is eventually completed. = NULL

4008

__bfq_bfqq_recalc_budget - try to adapt the budget to the @bfqq behavior.*@bfqd: device data.*@bfqq: queue to update.*@reason: reason for expiration.* Handle the feedback on @bfqq budget at queue expiration.* See the body for detailed comments.

4009

如果__bfq_bfqq_expire(bfqd, bfqq, reason)则返回

4014

如果非bfq_bfqq_busy(bfqq)且reason不等于udget took too long to be used 且reason不等于udget consumed 则

4017

bfq_mark_bfqq_non_blocking_wait_rq(bfqq)

4023

否则 amount of service received during the last service slot 等于0

4043

entity等于 parent entity, for hierarchical scheduling

4044

Next two macros are fake loops when cgroups support is not* enabled. I fact, in such a case, there is only one level to go up* (to reach the root group).(entity)

4045

amount of service received during the last service slot 等于0

**调用者**
名称	描述
bfq_bfqq_handle_idle_busy_switch
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_dispatch_rq_from_bfqq	Dispatch next request from bfqq.
bfq_rq_enqueued	Called when a new fs request (rq) is added to bfqq. Check if there's* something we should do about it.
bfq_completed_request
bfq_idle_slice_timer_body

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