Re: [RFC 1/6] Framework

[Andi Kleen]

> +#define global_page_state(__x) atomic_long_read(&vm_stat[__x])
> +#define zone_page_state(__z,__x) atomic_long_read(&(__z)->vm_stat[__x])
> +extern unsigned long node_page_state(int node, enum zone_stat_item);
> +
> +/*
> + * For use when we know that interrupts are disabled.

Why do you need to disable interupts for atomic_t ? 
If you just want to prevent switching CPUs that could be 
done with get_cpu(), but alternatively you could just ignore
that race (it wouldn't be a big issue to still increment
the counter on the old CPU)

And why atomic and not just local_t?  On x86/x86-64 local_t
would be much cheaper at least. It's not long, but that could
be as well added.

-Andi

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