Re: [PATCH 1/2] fs/proc/task_mmu: add guard region bit to pagemap

[David Hildenbrand]

> > My thinking was, that if you have a large VMA, with ordinary pagemap you
> > have to copy 8byte per entry (and have room for that somewhere in user
> > space). In theory, with the scanning feature, you can leave that ...
> > scanning to the kernel and don't have to do any copying/allocate space for
> > it in user space etc.
>
> That makes perfect sense!
>
> I think this one will go a little lower on priorities + I'll come back to it but
> I"ll put it on the one reliable todo list I have, the whiteboard in my home
> office :) everything on that list at least eventually gets looked at, majority
> get done.

Sounds good. I'm sure Android folks will speak up in case they require 
more efficient scanning.

> > --
> > Cheers,
> >
> > David / dhildenb
>
> Great minds think alike though ;) as soon as I saw this I did think about
> extending it, but seems I mistakenly dismissed for uffd reasons.
We should probably look into cleaning up + improving the documentation 
around the pagemap scan feature at some point. Well, something for 
another day :)

--
Cheers,

David / dhildenb