在Linux中相当于dwAllocationGranularity？ [英] Equivalent of dwAllocationGranularity in Linux?

问题描述

dwAllocationGranularity 在Linux中？在Windows中，其定义为：

What is the equivalent of dwAllocationGranularity in Linux? In Windows, it's defined as:

可以分配虚拟内存的起始地址的粒度。

The granularity for the starting address at which virtual memory can be allocated.

请注意，这与 PAGE_SIZE 是不同 物理页面的粒度。

（在Windows上，虚拟地址粒度在x86上为64 KiB，而页面大小当然为4 KiB。）

Note that this is not the same thing as PAGE_SIZE, which is the granularity of a physical page.
(On Windows, the virtual address granularity is 64 KiB on x86, whereas the page size is of course 4 KiB.)

推荐答案

Linux上与VirtualAlloc最接近的等效项是mmap，与VirtualAlloc一样，它允许您指定分配的内存的所需分配目标地址。在Windows上，此地址必须与分配粒度对齐。在Linux上，我从mmap手册页中引用：

The nearest equivalent of VirtualAlloc on Linux is mmap which, like VirtualAlloc, allows you to specify a desired allocation target address of the allocated memory. On Windows, this address must be aligned on the allocation granularity. On Linux, I quote from the mmap man page:

如果addr不为NULL，则内核将其用作提示位置。
放置映射；在Linux上，映射将在附近的
页面边界创建。

据我所知，没有分配粒度大于系统页面大小的情况，因此您应该能够安全地使用PAGE_SIZE作为替代。

As far as I know, there is no situation where the allocation granularity is higher than the page size of the system, so you should be able to safely use PAGE_SIZE as a substitute.

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