如何使在页表present一个过程的每一页面？ [英] How to make every page of a process in the page table present?

问题描述

我编译在Linux上使用gcc和KVM下运行它的静态程序。我检查guest虚拟机内存每到这个进程的页表项，发现部分网页已被映射和一些的人都没有。这是按需分页的功能？我的问题是是否有一个解决方案，以使所有的私人present并在页表映射？
例如。我叉一个新的进程和加载新的ELF程序，如何在这种新工艺的页表映射的每一页。
谢谢

i compiled a static program using gcc on linux and run it under kvm. I checked every page table entry of this process in guest memory and found that some pages have been mapped and some ones are not. Is this the feature of on-demand paging? My question is whether there is a solution to make all the pte present and mapped in the page table? E.g. i fork a new process and load a new elf binary, how to make every page mapped in the page table of this new process. Thanks

推荐答案

试用以下的系统调用：

#include <sys/mman.h>

int mlockall(int flags);

设置与MCL_FUTURE flags参数，它会锁定所有当前和未来的页到内存中。你可以找到更多关于它这里或只需键入人mlockall用于你将获得大量信息。

Set the flags parameter with MCL_FUTURE and it will lock all current and future pages into memory. You can find more info about it here or just type "man mlockall" and you will get a bunch of information.

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