compaction

函数名称：Returns true if compaction should go ahead for a costly-order request, or* the allocation would already succeed without compaction. Return false if we* should reclaim first.

函数原型：static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)

返回类型：bool

参数：

类型	参数	名称
struct zone *	zone
struct scan_control *	sc

2894

suitable等于compaction_suitable(zone, Allocation order , 0, The highest zone to isolate pages for reclaim from )

2895

如果suitable恒等于COMPACT_SUCCESS则返回:true

2898

如果suitable恒等于COMPACT_SKIPPED则返回:false

2911

watermark等于high_wmark_pages(zone)加Number of free order-0 pages that should be available above given watermark* to make sure compaction has reasonable chance of not running out of free* pages that it needs to isolate as migration target during its work.

2913

返回:zone_watermark_ok_safe(zone, 0, watermark, The highest zone to isolate pages for reclaim from )

**调用者**
名称	描述
shrink_zones	This is the direct reclaim path, for page-allocating processes. We only* try to reclaim pages from zones which will satisfy the caller's allocation* request.* If a zone is deemed to be full of pinned pages then just give it a light

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