The memory access tracing client gathers virtual addresses. On Linux, if the kernel allows user-mode applications access to the
/proc/self/pagemap file, physical addresses may be used instead. This can be requested via the
-use_physical runtime option (see Simulator Parameters). This works on current kernels but is expected to stop working from user mode on future kernels due to recent security changes (see http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ab676b7d6fbf4b294bf198fb27ade5b0e865c7ce).