Re: [PATCH 1/2] sched, numa, mm: Count WS scanning against presentPTEs, not virtual memory ranges

[Rik van Riel]

On 11/14/2012 03:50 AM, Ingo Molnar wrote:
> From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
>
> By accounting against the present PTEs, scanning speed reflects the
> actual present (mapped) memory.
>
> For this we modify mm/mprotect.c::change_protection() to return the
> number of ptes modified. (No change in functionality.)

We need to figure out what we actually want here.

Do we want to mark 256MB as non-present, or do we want to leave
behind 256MB of non-present (NUMA) memory? :)

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