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    SubjectRe: 2.6.33 pagemap endless read loop
    On Sun, Jan 10, 2010 at 01:37:02PM +0100, Andi Kleen wrote:
    >> Are you sure
    >I don't know if it's really endless, but it's doing a good emulation
    >of it if it's not.
    >> On my 32bit machine, it runs for a long time, but finally exits.
    >That was on 64bit.
    >proc01 had accumulated several minutes of CPU time when I stopped it.
    >> From the document of pagemap, it is the mapping of all the virtual pages
    >> of a process, on x86-32, it should be 4G/4K = 1024*1024 pages, also
    >Only the mapped ones surely?
    >Right now it looks like it dumps all the holes and that obviously
    >will never finish on 64bit which has 47bits of address space.

    Hmm, could you please try:

    time cat /proc/self/pagemap >/dev/null

    ? Is it much faster than:

    time cat /proc/self/pagemap


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