Re: [PATCH 3/3] mm/devmap: Remove pgmap accounting in the get_user_pages_fast() path
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On Thu, Mar 25, 2021 at 7:34 AM Jason Gunthorpe <jgg(a)ziepe.ca> wrote:
On Thu, Mar 18, 2021 at 10:03:06AM -0700, Dan Williams wrote:
> Yes. I still need to answer the question of whether mapping
> invalidation triggers longterm pin holders to relinquish their hold,
> but that's a problem regardless of whether gup-fast is supported or
> not.
It does not, GUP users do not interact with addres_space or mmu
notifiers
Ok, but the SIGKILL from the memory_failure() will drop the pin?
Can memory_failure() find the right processes to kill if the memory
registration has been passed by SCM_RIGHTS?
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Dan Williams