blkcg_scale

Name:Scale the accumulated delay based on how long it has been since we updated* the delay. We only call this when we are adding delay, in case it's been a* while since we added delay, and when we are checking to see if we need to

Proto:static void blkcg_scale_delay(struct blkcg_gq *blkg, u64 now)

Type:void

Parameter:

Type	Parameter	Name
struct blkcg_gq *	blkg
u64	now

1515

old = atomic64_read( & delay_start)

1530

If time_before64(old + NSEC_PER_SEC, now) && atomic64_cmpxchg( & delay_start, old, now) == old Then

1532

cur = atomic64_read( & delay_nsec)

1533

sub = min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(u64, last_delay, now - old)

1534

cur_use = atomic_read( & use_delay)

1540

If cur_use < last_use Then sub = max_t - return maximum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(u64, sub, last_delay >> 1)

1549

If Value for the false possibility is greater at compile time(cur < sub) Then

1550

atomic64_set( & delay_nsec, 0)

1551

last_delay = 0

1552

Else

1553

atomic64_sub(sub, & delay_nsec)

1554

last_delay = cur - sub

1556

last_use = cur_use

**Caller**
Name	Describe
blkcg_maybe_throttle_blkg	This is called when we want to actually walk up the hierarchy and check to* see if we need to throttle, and then actually throttle if there is some* accumulated delay. This should only be called upon return to user space so
blkcg_add_delay	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

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