Re: objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in<=16G machines)

[Andrew Morton]

Andrea Arcangeli <andrea@xxxxxxx> wrote:
>
>  > I don't recall that the objrmap patches ever significantly affected CPU
>  > utilisation.
> 
>  it does, the number precisely is a 30% figure slowdown in kernel compiles.

I think this might have been increased system time, not increased runtime.

>  also check any readprofile in any of your boxes, rmap is at the very
>  top.

With super-forky workloads, yes.  But we were somewhat disappointed in the
(lack of) improvements which [an]objrmap offered.

It sounds like a bunch of remeasuring is needed.  No doubt someone will do
this as we move these patches along.
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