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As the title suggests, I have a problem of obtaining the physical address from a virtual one. Let me explain: Given a variable declaration in process space, how can I derive it's physical address mapped by the OS? I've stumbled upon some sys calls /asm/io.h where the virt_to_phys() function is defined; however it seems this header is outdated and I can't find a work around. However; io.h is available at: /usr/src/linux-headers-2.6.35-28-generic/arch/x86/include/asm/ . My current kernel is 2.6.35-28 , but io.h isn't included in /usr/include/asm/ ? So, to reiterate: I need a way to get the physical address from virtual. Preferably derived from within the application at runtime. But even a workaround of using a monitor of /proc/PID/maps will do. Any ideas or comments would be greatly appreciated. EDIT After doing a bit of research on this topic I found something that helps in this regard. It turns out this is more than doable, although requires a bit of a workaround. Here is a link to a simple app that analyses the current mapped pages. The file in question turns out is (a binary file) /proc/pid/pagemap (contains the physical mapping of virtual pages). Anyway, the code in that link can be modified to serve as a monitor app or something. I needed the physical address for cache simulation purposes. Thanks for all the help and answers!

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