On Wed, 7 Feb 2007, Christoph Lameter wrote:
> Clearing reference bits? Ummm... That is a pretty inaccurate measure since
> reclaim can remove pages and revert the reference bits. It can never work
> reliably.
>
It's not intended to work precisely, it's intended to give a good estimate
of task memory footprint. There are several different scenarios that can
interfere with getting a precise measurement via this method; then again
/proc/pid/smaps is so expensive already because of the iteration through
VMA's that it's not something you'd do regularly.
Any other suggestions on how to obtain this data is certainly welcome.
> Would it be possible to sync up with the people doing the page table
> interface?
>
(+pauld)
Is there an update on Paul Davies' implementation that would allow us to
iterate through a set of pte's in a vm_area_struct range?
> Could we somehow consolidate smaps and numa_maps?
>
Sure, but that's beyond the scope of this patchset. My intention in
extracting away a new pte_walker was to prevent having two identical
implementations and it could easily be extracted even further to lib for
the ioremap case that Paul mentioned.
David
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