Re: [thisops uV2 02/10] vmstat: Optimize zone counter modificationsthrough the use of this cpu operations

[Pekka Enberg]

On Fri, Nov 26, 2010 at 11:09 PM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> this cpu operations can be used to slightly optimize the function. The
> changes will avoid some address calculations and replace them with the
> use of the percpu segment register.
>
> If one would have this_cpu_inc_return and this_cpu_dec_return then it
> would be possible to optimize inc_zone_page_state and dec_zone_page_state even
> more.
>
> V1->V2:
>        - Fix __dec_zone_state overflow handling
>        - Use s8 variables for temporary storage.
>
> Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>

Reviewed-by: Pekka Enberg <penberg@xxxxxxxxxx>
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