I just installed JVM monitor from eclipse marketplace. I am using eclipse indigo and working on 64bit OS & while monitoring memory it shows the message like : Monitoring histogram of eclipse itself not supported in 64bit OS. All other are file in JVM Monitor.
Or perhaps you just need to run a 32-bit Eclipse with a 32-bit JDK, which is easier to do on Windows than on Linux. (The problem is most likely that the monitor uses a native library and that library is 32-bit only.)