Re: [PATCH v4 13/13] x86/folio_zero_user: Add multi-page clearing

[Ankur Arora]

Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:

> On Mon, Jun 16, 2025 at 07:44:13AM -0700, Dave Hansen wrote:
>
>> To me, that's deserving of an ARCH_HAS_FOO bit that we can set on the
>> x86 side that then cajoles the core mm/ code to use the fancy new
>> clear_pages_resched() implementation.
>
> Note that we should only set this bit with either full or lazy
> preemption selected. Haven't checked the patch-set to see if that
> constraint is already taken care of.

It is. I check for preempt_model_preemptible() and limit voluntary models
to chunk sizes of 8MB.

--
ankur