On Thu, May 03, 2007 at 11:32:23AM +1000, Nick Piggin wrote:
> The attached patch gets performance up a bit by avoiding some
> barriers and some cachelines:
>
> G5
> pagefault fork exec
> 2.6.21 1.49-1.51 164.6-170.8 741.8-760.3
> +patch 1.71-1.73 175.2-180.8 780.5-794.2
> +patch2 1.61-1.63 169.8-175.0 748.6-757.0
>
> So that brings the fork/exec hits down to much less than 5%, and
> would likely speed up other things that lock the page, like write
> or page reclaim.
Is that every fork/exec or just under certain cicumstances?
A 5% regression on every fork/exec is not acceptable.
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