Re: [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings()

Peter Zijlstra
2020-05-11T07:42:56Z

On Sat, May 09, 2020 at 12:05:29PM -0700, Andy Lutomirski wrote:

> On x86_64, the only real advantage is that the handful of corner cases
> that make vmalloc faults unpleasant (mostly relating to vmap stacks)
> go away. On x86_32, a bunch of mind-bending stuff (everything your
> series deletes but also almost everything your series *adds*) goes
> away. There may be a genuine tiny performance hit on 2-level systems
> due to the loss of huge pages in vmalloc space, but I'm not sure I
> care or that we use them anyway on these systems. And PeterZ can stop
> even thinking about RCU.
>
> Am I making sense?

I think it'll work for x86_64 and that is really all I care about :-)