wb_over_bg_thresh

函数名称：wb_over_bg_thresh - does @wb need to be written back?*@wb: bdi_writeback of interest* Determines whether background writeback should keep writing @wb or it's* clean enough.* Return: %true if writeback should continue.

函数原型：bool wb_over_bg_thresh(struct bdi_writeback *wb)

返回类型：bool

参数：

类型	参数	名称
struct bdi_writeback *	wb

1930

struct dirty_throttle_control gdtc_stor = {GDTC_INIT(wb)}

1931

struct dirty_throttle_control mdtc_stor = {MDTC_INIT(wb, & gdtc_stor)}

1932

gdtc等于gdtc_stor

1933

struct dirty_throttle_control * const mdtc = mdtc_valid( & mdtc_stor) ? & mdtc_stor : NULL

1940

dirtyable 等于global_dirtyable_memory - number of globally dirtyable pages* Return: the global number of pages potentially available for dirty* page cache. This is the base value for the global dirty limits.

1941

le_dirty + write + nfs 等于global_node_page_state(NR_FILE_DIRTY)加global_node_page_state(NR_UNSTABLE_NFS)

1943

domain_dirty_limits - calculate thresh and bg_thresh for a wb_domain*@dtc: dirty_throttle_control of interest* Calculate @dtc->thresh and ->bg_thresh considering* vm_dirty_{bytes|ratio} and dirty_background_{bytes|ratio}. The caller

1945

如果le_dirty + write + nfs 大于dirty background threshold 则返回:true

1948

如果wb_stat(wb, WB_RECLAIMABLE)大于wb_calc_thresh(wb, dirty background threshold )则返回:true

1952

如果mdtc则

1955

mem_cgroup_wb_stats(wb, & filepages, & headroom, & le_dirty + write + nfs , & writeback)

1957

Memory which can be further allocated to a memcg domain is capped by* system-wide clean memory excluding the amount being used in the domain.

1958

1960

如果le_dirty + write + nfs 大于dirty background threshold 则返回:true

1963

如果wb_stat(wb, WB_RECLAIMABLE)大于wb_calc_thresh(wb, dirty background threshold )则返回:true

1968

返回:false

**调用者**
名称	描述
wb_check_background_flush
wb_writeback	Explicit flushing or periodic writeback of "old" 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