blkcg_iolatency_throttle

Name:blkcg_iolatency_throttle

Proto:static void blkcg_iolatency_throttle(struct rq_qos *rqos, struct bio *bio)

Type:void

Parameter:

Type	Parameter	Name
struct rq_qos *	rqos
struct bio *	bio

462

blkiolat = BLKIOLATENCY(rqos)

463

blkg = * Represents the association of the css and request_queue for the bio. * If a bio goes direct to device, it will not have a blkg as it will * not have a request_queue associated with it. The reference is put * on release of the bio.

464

issue_as_root = _issue_as_root_blkg - see if this bio needs to be issued as root blkg*@return: true if this bio needs to be submitted with the root blkg context

466

If Not blk_iolatency_enabled(blkiolat) Then Return

469

When blkg && all non-root blkcg_gq's are guaranteed to have access to parent cycle

470

iolat = blkg_to_lat(blkg)

471

If Not iolat Then

472

blkg = all non-root blkcg_gq's are guaranteed to have access to parent

473

Continue

476

Check our parent and see if the scale cookie has changed.

477

__blkcg_iolatency_throttle(rqos, iolat, issue_as_root, ( bottom bits req flags, * top bits REQ_OP. Use * accessors. & REQ_SWAP) == REQ_SWAP)

479

blkg = all non-root blkcg_gq's are guaranteed to have access to parent

481

If Not mer_pending - is a timer pending?*@timer: the timer in question* timer_pending will tell whether a given timer is currently pending,* or not. Callers must ensure serialization wrt. other operations done* to this timer, eg Then mod_timer - modify a timer's timeout*@timer: the timer to be modified*@expires: new timeout in jiffies* mod_timer() is a more efficient way to update the expire field of an* active timer (if the timer is inactive it will be activated)* mod_timer(timer,

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