wb_position

函数名称：Dirty position control

函数原型：static void wb_position_ratio(struct dirty_throttle_control *dtc)

返回类型：void

参数：

类型	参数	名称
struct dirty_throttle_control *	dtc

906

wb等于wb

907

write_bw等于urther smoothed write bw, > 0

908

freerun等于dirty_freerun_ceiling(dirty threshold , dirty background threshold )

909

limit等于hard_dirty_limit(dtc_dom(dtc), dirty threshold )

910

wb_thresh等于wb_thresh

918

pos_ratio等于0

920

如果此条件成立可能性小(为编译器优化)(le_dirty + write + nfs >= limit)则返回

928

setpoint等于freerun加limit的和除2

929

pos_ratio等于(dirty) := 1

956

如果此条件成立可能性小(为编译器优化)(capabilities & BDI_CAP_STRICTLIMIT)则

959

如果per-wb counterparts 小于8则

960

pos_ratio等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(longlong, pos_ratio * 2, 2 << RATELIMIT_CALC_SHIFT)

962

965

如果per-wb counterparts 大于等于wb_thresh则返回

968

wb_setpoint等于dirty_freerun_ceiling(wb_thresh, wb_bg_thresh)

971

如果wb_setpoint恒等于0或wb_setpoint恒等于wb_thresh则返回

974

wb_pos_ratio等于(dirty) := 1

998

pos_ratio等于两数取小(pos_ratio, wb_pos_ratio)

999

1033

如果此条件成立可能性小(为编译器优化)(wb_thresh > dirty threshold )则wb_thresh等于dirty threshold

1042

wb_thresh等于两数取大(wb_thresh, (limit - le_dirty + write + nfs ) / 8)

1047

x等于div_u64 - unsigned 64bit divide with 32bit divisor*@dividend: unsigned 64bit dividend*@divisor: unsigned 32bit divisor* This is the most common 64bit divide and should be used if possible,* as many 32bit archs can optimize this variant better than a full

1048

wb_setpoint等于setpoint乘x右移16位

1057

span等于dirty threshold 减wb_thresh加8乘write_bw的和乘x右移16位

1058

x_intercept等于wb_setpoint加span

1060

如果per-wb counterparts 小于x_intercept减span除4则

1061

pos_ratio等于div64_u64 - unsigned 64bit divide with 64bit divisor*@dividend: 64bit dividend*@divisor: 64bit divisor* This implementation is a modified version of the algorithm proposed* by the book 'Hacker's Delight'. The original source and full proof

1063

否则pos_ratio除等于4

1071

x_intercept等于wb_thresh除2

1072

如果per-wb counterparts 小于x_intercept则

1073

如果per-wb counterparts 大于x_intercept除8则pos_ratio等于div_u64 - unsigned 64bit divide with 32bit divisor*@dividend: unsigned 64bit dividend*@divisor: unsigned 32bit divisor* This is the most common 64bit divide and should be used if possible,* as many 32bit archs can optimize this variant better than a full

1076

否则pos_ratio乘等于8

1080

pos_ratio等于pos_ratio

**调用者**
名称	描述
balance_dirty_pages	alance_dirty_pages() must be called by processes which are generating dirty* data

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