问题描述
我了解在Linux中， mm_struct 描述了进程的内存布局.我也理解 start_brk 和 brk 分别标记了进程堆部分的开始和结束.
I understand that in Linux the mm_struct describes the memory layout of a process. I also understand that the start_brk and brk mark the start and end of the heap section of a process respectively.
现在，这是我的问题:我有一个过程为我编写了源代码，该过程使用 malloc 分配了5.25 GB的堆内存.但是，当我使用内核模块检查进程的 mm_sruct 时，我发现的值等于135168.这与我的预期不同:我期望的是 brk-start_brk 略高于5.25 GB.
Now, this is my problem: I have a process, for which I wrote the source code, that allocates 5.25 GB of heap memory using malloc. However, when I examine the process's mm_sruct using a kernel module I find the value of is equal to 135168. And this is different from what I expected: I expected brk - start_brk to be equal slight above 5.25 GB.
那么，这是怎么回事?
谢谢.
推荐答案
我在中注意到以下内容 malloc(3) 的联机帮助页:
I notice the following in the manpage for malloc(3):
所以听起来好像使用了 mmap 而不是堆.
So it sounds like mmap is used instead of the heap.
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