Your conclusion is 'did not participate with upstream'; I don't agree with
that. But maybe you and Kalesh have a history on that that let's you react
on his questions IMHO more emotionally than it should have been.
This is wholly unfair, I have been very reasonable in response to this
thread. I have offered to find solutions, I have tried to understand the
problem in spite of having gone to great lengths to try to discuss the
limitations of the proposed approach in every venue I possibly could.
I go out of my way to deal professionally and objectively with what is
presented. Nothing here is emotional. So I'd ask that you please abstain
from making commentary like this which has no basis.
I appreciate everything you write below. But this request is just
impossible. I will keep raising my opinion and misunderstandings will
happen.
Note that the whole "Honestly David you and the naming. .." thing could
have been written as "I don't think it's a naming problem."
[...]
As I said to you earlier, the _best_ we could do in smaps would be to add a
flag like 'Grd' or something to indicate some part of the VMA is
guarded. But I won't do that unless somebody has an -actual use case- for
it.
Right, and that would limit where you have to manually scan. Something
similar is being done with uffd-wp markers IIRC.
Yeah that's a good point, but honestly if you're reading smaps that reads
the page tables, then reading /proc/$pid/pagemaps and reading page tables
TWICE that seems inefficient vs. just reading /proc/$pid/maps, then reading
/proc/$pid/pagemaps and reading page tables once.
Right; I recently wished that we would have an interface to obtain more VMA
flags without having to go through smaps
Well maybe that lends itself to the idea of adding a whole new interface in
general...
An extended "maps" interface might be reasonable, that allows for
exposing more things without walking the page tables. (e.g., flags)
Maybe one could have an indicator that says "ever had guard regions in
this mapping" without actually walking the page tables.
--
Cheers,
David / dhildenb
