Re: [PATCH 00/13] mmu_notifier kill invalidate_page callback

On Tue, Aug 29, 2017 at 05:11:24PM -0700, Linus Torvalds wrote:

On Tue, Aug 29, 2017 at 4:54 PM, Jérôme Glisse [off-list ref] wrote:

quoted

Note this is barely tested. I intend to do more testing of next few days
but i do not have access to all hardware that make use of the mmu_notifier
API.

Thanks for doing this.

quoted

First 2 patches convert existing call of mmu_notifier_invalidate_page()
to mmu_notifier_invalidate_range() and bracket those call with call to
mmu_notifier_invalidate_range_start()/end().

Ok, those two patches are a bit more complex than I was hoping for,
but not *too* bad.

And the final end result certainly looks nice:

quoted

 16 files changed, 74 insertions(+), 214 deletions(-)

Yeah, removing all those invalidate_page() notifiers certainly makes
for a nice patch.

And I actually think you missed some more lines that can now be
removed: kvm_arch_mmu_notifier_invalidate_page() should no longer be
needed either, so you can remove all of those too (most of them are
empty inline functions, but x86 has one that actually does something.

So there's an added 30 or so dead lines that should be removed in the
kvm patch, I think.

Yes i missed that. I will wait for people to test and for result of my
own test before reposting if need be, otherwise i will post as separate
patch.

But from a _very_ quick read-through this looks fine. But it obviously
needs testing.

People - *especially* the people who saw issues under KVM - can you
try out Jérôme's patch-series? I aded some people to the cc, the full
series is on lkml. Jérôme - do you have a git branch for people to
test that they could easily pull and try out?

https://cgit.freedesktop.org/~glisse/linux mmu-notifier branch
git://people.freedesktop.org/~glisse/linux

(Sorry if that tree is bit big it has a lot of dead thing i need
 to push a clean and slim one)

Jérôme