Hi, Linux kernel basically manages all available physical memory pages. If user-space need a page, kernel allocates a page for it. Hence a physical page may be in mapped to user-space virtual address or kernel-space virtual address or both. The user-space and kernel-space exist in virtual address space, not physical. Thanks, Min-Hua On Wed, May 27, 2015 at 09:12:11AM +0800, Le Tan wrote:
Hi, Is there an explict split between userspace and kernel in physical memory on Linux x86-64? That is, given a physical address, can I tell whether this address is from userspace or not? As far as I know, in virtual address space, the kernel will use the upper half and the userspace will use the lower half. But what about in physical address space?
Thanks very much!
Le
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