Keyword Analysis & Research: linux process virtual address space


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What is a process's virtual address space?

A process has a virtual address space that serves as a virtual memory map for data, code, stack, heap, etc. Those functions are taking a single virtual address within the process virtual address space and helping with walking through the page tables to find its page table entry and then its physical address (or checking page table entry flags).

How does virtual memory work in Linux?

So, with the help of virtual memory, Linux kernel can map the memory regions that contains the executable code into the address space for each process. Each process has the following areas:

What is the linear address space in Linux?

Linear Address Space The linear address space remains essentially the same as 2.4 with no modifications that cannot be easily recognised. The main change is the addition of a new page usable from userspace that has been entered into the fixed address virtual mappings. On the x86, this page is located at 0xFFFFF000and called the vsyscall page.

What is a virtual memory address?

On a 64-bit computer, a memory address manipulated by your program is an integer between 0 and 18446744073709551615 inclusive. Such an address is called a virtual memory address. The range of those addresses is called the virtual address space of the process.


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