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 16:38:18
Last Modify:2020-03-12 14:18:49 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：setup_per_zone_lowmem_reserve - called whenever* sysctl_lowmem_reserve_ratio changes. Ensures that each zone* has a correct pages reserved value, so an adequate number of* pages are left in the zone after a successful __alloc_pages().

函数原型：static void setup_per_zone_lowmem_reserve(void)

返回类型：void

参数：无

7694  以j小于MAX_NR_ZONES循环
7695  zone等于包含了结点中各内存域的数据结构加j
7696  managed_pages等于zone_managed_pages(zone)
7698  关键性内存分配[j]等于0
7700  idx等于j
7701  当idx循环
7704  idx自减
7705  lower_zone等于包含了结点中各内存域的数据结构加idx
7707  如果sults with 256, 32 in the lowmem_reserve sysctl:* 1G machine -> (16M dma, 800M-16M normal, 1G-800M high)* 1G machine -> (16M dma, 784M normal, 224M high)* NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA* HIGHMEM allocation will leave [idx]小于1则
7710  否则
7714  managed_pages加等于zone_managed_pages(lower_zone)
7720  alculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio* or min_free_kbytes changes.
调用者
名称描述
init_per_zone_wmark_minInitialise min_free_kbytes
lowmem_reserve_ratio_sysctl_handlerlowmem_reserve_ratio_sysctl_handler - just a wrapper around* proc_dointvec() so that we can call setup_per_zone_lowmem_reserve()* whenever sysctl_lowmem_reserve_ratio changes.* The reserve ratio obviously has absolutely no relation with the