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 > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
