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    SubjectRe: page fault scalability patch final : i386 tested, x86_64 support added
    That is still 2^(32+12) = 2^44 = 16TB.

    On Sat, 28 Aug 2004, Andi Kleen wrote:

    > > Index: linux-2.6.9-rc1/include/linux/sched.h
    > > ===================================================================
    > > --- linux-2.6.9-rc1.orig/include/linux/sched.h 2004-08-25 10:50:12.534021000 -0700
    > > +++ linux-2.6.9-rc1/include/linux/sched.h 2004-08-27 12:14:09.564008624 -0700
    > > @@ -197,9 +197,10 @@
    > > pgd_t * pgd;
    > > atomic_t mm_users; /* How many users with user space? */
    > > atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
    > > + atomic_t mm_rss; /* Number of pages used by this mm struct */
    >
    > atomic_t is normally 32bit, even on a 64bit arch. This will limit the max
    > memory size per process to 2^(32+PAGE_SHIFT). I don't think that's a good idea.
    >
    > On some architectures it used to be 24bit only even, but I think that
    > has been fixed.
    >
    > I think you need atomic64_t
    >
    > -Andi
    >
    -
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