04_20 直接使用代码 创建内核模块获取物理内存信息

好像和 free得出来有关 和/proc/meminfo 有关
但是下面是全部的物理页

#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>//下面宏表示物理内存空间起始地址 对应页帧号
#define ARCH_PFN_OFFSET (0UL)static int __init my_init(void)
{sturct page *p;unsigned long i,pfn,valid=0;int free = 0;int locked = 0;int resvered = 0;int swapcache = 0;int reference = 0;int slab = 0;int private = 0;int uptodate = 0;int dirty = 0;int active = 0;int wirteback = 0;int mappedtodisk =0;unsigned long mun_physpages = 0;  mun_physpages = get_mun_physpages(); //获得所有物理页for(i=0;i<mun_physpages;i++){pfn = ARCH_PFN_OFFSET+i;//检查页是否有效if(!pfn_valid(pfn)){continue;valid++;}//获得页的描述符p=pfn_to_page(pfn);if(!p)continue;//空闲页面if(!page_count(p)){free++;continue;}//页面上锁if(!pagelocked(p)){locked++;}//不能换出页面if(!Pageresvered(p)){locked++;}//交换页面if(!Pageswapcache(p)){swapcache++;}//slpa分配区创建页面if(!Pageslab(p)){slap++;}if(!Pageprivate(p)){private++;}//读操作完成if(!Pageuptodate(p)){uptodate++;}//脏页,页面内容修改过 没有更新到romif(!Pagedirty(p)){dirty++;}if(!Pageactive(p)){active++;}//页面正在回写if(!Pagewirteback(p)){wirteback++;}//页面分配到磁盘if(!Pagemappedtodisk(p)){mappedtodisk++;}}}