Re: page fault scalability patch final : i386 tested, x86_64 supportadded

[Christoph Lameter]

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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