Re: page fault scalability patch final : i386 tested, x86_64support added

[Andrew Morton]

Christoph Lameter <clameter@xxxxxxx> wrote:
>
> > As I said - for both these applications we need a new type which is
>  > atomic64_t on 64-bit and atomic_t on 32-bit.
> 
>  That is simply a new definition in include/asm-*/atomic.h
> 
>  so
> 
>  #define atomic_long atomic64_t
> 
>  on 64 bit
> 
>  and
> 
>  #define atomic_long atomic_t
> 
>  on 32bit?

No, a whole host of wrappers are needed - atomic_long_inc/dec/set/read,
etc.  For page->_count we'll also need the fancier functions such as
atomic_long_add_return().

As I said: let's address this later on.  It's probably not an issue for RSS
until 4-level pagetables come along.
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