blkcg_scale

函数名称：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

函数原型：static void blkcg_scale_delay(struct blkcg_gq *blkg, u64 now)

返回类型：void

参数：

类型	参数	名称
struct blkcg_gq *	blkg
u64	now

1515

old等于atomic64_read( & delay_start)

1530

如果time_before64(old + NSEC_PER_SEC, now)且atomic64_cmpxchg( & delay_start, old, now)恒等于old则

1532

cur等于atomic64_read( & delay_nsec)

1533

sub等于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等于atomic_read( & use_delay)

1540

如果cur_use小于last_use则sub等于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

如果此条件成立可能性小(为编译器优化)(cur < sub)则

1550

atomic64_set( & delay_nsec, 0)

1551

last_delay等于0

1552

否则

1553

atomic64_sub(sub, & delay_nsec)

1554

last_delay等于cur减sub

1556

last_use等于cur_use

**调用者**
名称	描述
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

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告