Re: [RFC PATCH] mm, oom: distinguish blockable mode for mmu notifiers

[Michal Hocko <mhocko@kernel.org>]

On Mon 02-07-18 11:14:58, Christian Konig wrote:
> Am 27.06.2018 um 09:44 schrieb Michal Hocko:
> > This is the v2 of RFC based on the feedback I've received so far. The
> > code even compiles as a bonus ;) I haven't runtime tested it yet, mostly
> > because I have no idea how.
> > 
> > Any further feedback is highly appreciated of course.
> 
> That sounds like it should work and at least the amdgpu changes now look
> good to me on first glance.
> 
> Can you split that up further in the usual way? E.g. adding the blockable
> flag in one patch and fixing all implementations of the MMU notifier in
> follow up patches.

But such a code would be broken, no? Ignoring the blockable state will
simply lead to lockups until the fixup parts get applied.
Is the split up really worth it? I was thinking about that but had hard
times to end up with something that would be bisectable. Well, except
for returning -EBUSY until all notifiers are implemented. Which I found
confusing.

> This way I'm pretty sure Felix and I can give an rb on the amdgpu/amdkfd
> changes.

If you are worried to give r-b only for those then this can be done even
for larger patches. Just make your Reviewd-by more specific
R-b: name # For BLA BLA
-- 
Michal Hocko
SUSE Labs