Re: 2.6.22 -mm merge plans -- vm bugfixes

[Christoph Hellwig]

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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