Re: [RFC 1/3] Framework for accurate node based statistics

[Christoph Lameter]

On Tue, 6 Dec 2005, Andi Kleen wrote:

> > Yuck. That code uses atomic operations and is not aware of atomic64_t.
> Hmm? What code are you looking at? 
include/asm-generic/local.h. this is the default right? And 
include/asm-ia64/local.h.
 
> At least i386/x86-64/generic don't use any atomic operations, just
> normal non atomic on bus but atomic for interrupts local rmw.

inc/dec are atomic by default on x86_64?
 
> Do you actually need 64bit? 

32 bit limits us in the worst case to 8 Terabytes of RAM (assuming a very 
small page size of 4k and 31 bit available for an atomic variable 
[sparc]). SGI already has installations with 15 Terabytes of RAM.
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