On Fri, Jan 8, 2021 at 9:53 AM Andrea Arcangeli [off-list ref] wrote:

Do you intend to eventually fix the zygote vmsplice case or not?
Because in current upstream it's not fixed currently using the
enterprise default config.

Is this the hugepage case? Neither of your patches actually touched
that, so I've forgotten the details.

Irrelevant special case as in: long term GUP pin on the memory?

Irrelevant special case in that

 (a) an extra COW shouldn't be a correctness issue unless somebody
does something horribly wrong (and obviously the code that hasn't
taken the mmap_lock for writing are then examples of that)

and

 (b) it's not a performance issue either unless you can find a real
load that does it.

Hmm?

               Linus