Hi Min-Hua, 2015-05-27 22:23 GMT+08:00 Min-Hua Chen <orca.chen@xxxxxxxxx>: > 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. Very clear description! I always seems to be confused by some basic concept. :) Thanks! Le > 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
