我可以在 Linux 中进行写时复制 memcpy 吗? [英] Can I do a copy-on-write memcpy in Linux?

问题描述

我有一些代码，我经常在其中复制一大块内存，通常只是在对其进行非常小的更改之后.

I have some code where I frequently copy a large block of memory, often after making only very small changes to it.

我已经实现了一个跟踪更改的系统，但我认为这可能很好，如果可能的话，告诉操作系统对内存进行写时复制"，并让它只处理复制那些改变的部分.然而，虽然 Linux 执行写时复制，例如在 fork() 时，我找不到控制它并自己做的方法.

I have implemented a system which tracks the changes, but I thought it might be nice, if possible to tell the OS to do a 'copy-on-write' of the memory, and let it deal with only making a copy of those parts which change. However while Linux does copy-on-write, for example when fork()ing, I can't find a way of controlling it and doing it myself.

推荐答案

你最好的机会可能是 mmap() 将原始数据归档，然后 mmap() 再次使用 MAP_PRIVATE 相同的文件.

Your best chance is probably to mmap() the original data to file, and then mmap() the same file again using MAP_PRIVATE.

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