[RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast
ira.weiny at intel.com
Tue Mar 26 01:54:11 AEDT 2019
On Mon, Mar 25, 2019 at 03:36:28PM -0700, Dan Williams wrote:
> On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny at intel.com> wrote:
> > FWIW this thread is making me think my original patch which simply implemented
> > get_user_pages_fast_longterm() would be more clear. There is some evidence
> > that the GUP API was trending that way (see get_user_pages_remote). That seems
> > wrong but I don't know how to ensure users don't specify the wrong flag.
> What about just making the existing get_user_pages_longterm() have a
> fast path option?
That would work but was not the direction we agreed upon before.
At this point I would rather see this patch set applied, focus on fixing the
filesystem issues, and once that is done determine if FOLL_LONGTERM is needed
in any GUP calls.
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