Re: [PATCH V2 0/6] VA to numa node information

[Dave Hansen]

On 09/14/2018 11:04 AM, Prakash Sangappa wrote:
> Also, for valid VMAs in  'maps' file, if the VMA is sparsely
> populated with  physical pages, the page walk can skip over non
> existing page table entires (PMDs) and so can be faster.
Note that this only works for things that were _never_ populated.  They
might be sparse after once being populated and then being reclaimed or
discarded.  Those will still have all the page tables allocated.