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SubjectRe: [PATCH v11 00/25] mm/gup: track dma-pinned pages: FOLL_PIN
On 12/20/19 4:51 PM, Dan Williams wrote:
> On Fri, Dec 20, 2019 at 4:41 PM John Hubbard <> wrote:
>> On 12/20/19 4:33 PM, Dan Williams wrote:
>> ...
>>>> I believe there might be also a different solution for this: For
>>>> transparent huge pages, we could find a space in 'struct page' of the
>>>> second page in the huge page for proper pin counter and just account pins
>>>> there so we'd have full width of 32-bits for it.
>>> That would require THP accounting for dax pages. It is something that
>>> was probably going to be needed, but this would seem to force the
>>> issue.
>> Thanks for mentioning that, it wasn't obvious to me yet.
>> How easy is it for mere mortals outside of Intel, to set up a DAX (nvdimm?)
>> test setup? I'd hate to go into this without having that coverage up
>> and running. It's been sketchy enough as it is. :)
> You too can have the power of the gods for the low low price of a
> kernel command line parameter, or a qemu setup.
> Details here:

Sweeeet! Now I can really cause some damage. :)

John Hubbard

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