函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\page_alloc.c Create Date:2022-07-27 16:35:25
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：zone_watermark_ok_safe

函数原型：bool zone_watermark_ok_safe(struct zone *z, unsigned int order, unsigned long mark, int classzone_idx)

返回类型：bool

参数：

类型参数名称
struct zone *z
unsigned intorder
unsigned longmark
intclasszone_idx
3505  free_pages等于zone_page_state(z, First 128 byte cacheline (assuming 64 bit words) )
3507  如果 Write-intensive fields used by compaction and vmstats. 且free_pages小于 Write-intensive fields used by compaction and vmstats. 则free_pages等于More accurate version that also considers the currently pending* deltas. For that we need to loop over all cpus to find the current* deltas. There is no synchronization so the result cannot be* exactly accurate either.
3510  返回:Return true if free base pages are above 'mark'. For high-order checks it* will return true of the order-0 watermark is reached and there is at least* one free page of a suitable size. Checking now avoids taking the zone lock
调用者
名称描述
pgdat_balancedReturns true if there is an eligible zone balanced for the request order* and classzone_idx
compaction_readyReturns 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.