Re: [RFC PATCH 3/5] mm/page_alloc: convert any movable pageblock on a non-movable allocation

[Rik van Riel]

On Thu, 2026-10-15 at 13:50 +0530, Dev Jain wrote:
> 
> > 
> > I have code for that, too, but it seems like
> > it's a lot easier to get things reviewed in
> > small portions.
> > 
> > If you want I can resend this as a larger
> > series, with:
> > 1) the pageblock claiming
> > 2) per migrate type free lists
> > 3) evacuation of movable pages from unmovable 
> >    pageblocks, when the kernel free lists fall 
> >    below a watermark
> > 
> > That would be the full extent of the 2MB granularity
> > fragmentation avoidance stuff I have here.
> 
> I think your patch series applied as-is would regress stuff:
> we may have lots of UNMOVABLE pageblocks with lots of
> movable allocations, unable to be rescued, hurting mTHP
> allocations.

How should we move forward with this?

Do do guys want to review this series first,
and then I post an update with the other
stuff, before any gets merged?

Or do you want me to post a larger series
all at once?

Before I move on, do the combined policy
changes from patches 3, 4, and 5 make sense
to you (with or without evacuation) ?

Patch 1 from this series can be merged all
by itself as a separate thing.

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