Re: [PATCH] Prefaulting

[Andrew Morton]

Christoph Lameter <clameter@xxxxxxx> wrote:
>
> There is even a slight performance win in the
>  uniprocessor case:
> 
>  w/o any patch:
> 
>   Mb Rep Thr CLine  User      System   Wall  flt/cpu/s fault/wsec
>  200  3    1   1    0.01s      0.15s   0.01s846860.493 848882.424
>  200  3    1   1    0.01s      0.16s   0.01s827724.160 830841.482
>  200  3    1   1    0.00s      0.16s   0.01s827724.160 827364.176
> 
>  w/prefault patch
> 
>  200 MB allocation
> 
>   Mb Rep Thr CLine  User      System   Wall  flt/cpu/s fault/wsec
>  200  3    1   1    0.02s      0.48s   0.05s860119.275 859918.989
>  200  3    1   1    0.02s      0.46s   0.04s886129.730 886551.621
>  200  3    1   1    0.01s      0.47s   0.04s887920.166 886855.775

But the system time went through the roof.  Would that be accounting
inaccuracy?

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