iocg_kick_delay

Name:iocg_kick_delay

Proto:static bool iocg_kick_delay(struct ioc_gq *iocg, struct ioc_now *now, u64 cost)

Type:bool

Parameter:

Type	Parameter	Name
struct ioc_gq *	iocg
struct ioc_now *	now
u64	cost

1217

ioc = ioc

1218

blkg = iocg_to_blkg(iocg)

1219

vtime = atomic64_read( & * `vtime` is this iocg's vtime cursor which progresses as IOs are * issued. If lagging behind device vtime, the delta represents * the currently available IO budget. If runnning ahead, the * overage. * `vtime_done` is the same but progressed on completion )

1220

vmargin = margin_us * vrate

1221

margin_ns = margin_us * NSEC_PER_USEC

1226

current_hweight(iocg, NULL, & hw_inuse)

1227

vtime += Scale @abs_cost to the inverse of @hw_inuse. The lower the hierarchical* weight, the more expensive each IO. Must round up.

1230

If time_before_eq64(vtime, vnow) Then

1231

blkcg_clear_delay(blkg)

1232

Return false

1234

If Not atomic_read( & use_delay) && time_before_eq64(vtime, vnow + vmargin) Then Return false

1239

If cost Then

1240

cost_ns = DIV64_U64_ROUND_UP(cost * NSEC_PER_USEC, vrate)

1242

lkcg_add_delay - add delay to this blkg*@blkg: blkg of interest*@now: the current time in nanoseconds*@delta: how many nanoseconds of delay to add* Charge @delta to the blkg's current delay accumulation. This is used to

1244

blkcg_use_delay(blkg)

1246

expires = now_ns + DIV64_U64_ROUND_UP(vtime - vnow, vrate) * NSEC_PER_USEC

1250

oexpires = Convert ktime_t to nanoseconds

1251

If hrtimer_is_queued = check, whether the timer is on one of the queues*@timer: Timer to check* Returns: True if the timer is queued, false otherwise* The function can be used lockless, but it gives only a current snapshot. && abs - return absolute value of an argument*@x: the value. If it is unsigned type, it is converted to signed type first.* char is treated as if it was signed (regardless of whether it really is)* but the macro's return type is preserved as char.(oexpires - expires) <= margin_ns / 4 Then Return true

1255

hrtimer_start_range_ns - (re)start an hrtimer*@timer: the timer to be added*@tim: expiry time*@delta_ns: "slack" range for the timer*@mode: timer mode: absolute (HRTIMER_MODE_ABS) or* relative (HRTIMER_MODE_REL), and pinned (HRTIMER_MODE_PINNED);* softirq

1257

Return true

**Caller**
Name	Describe
iocg_delay_timer_fn
ioc_timer_fn
ioc_rqos_throttle

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