Re: [PATCH v7 0/7] mm: Hot page tracking and promotion infrastructure

Gregory Price
2026-05-06T15:22:43Z

On Mon, May 04, 2026 at 09:36:05PM +0100, Matthew Wilcox wrote:
> On Mon, May 04, 2026 at 11:39:17AM +0530, Bharata B Rao wrote:
> > This is v7 of pghot, a hot-page tracking and promotion subsystem. The
>
> I continue to think we should not do this.

My only pushback on the general "we should not do this" is that we need
something to counter-balance the demotion bit in vmscan.c, and the
current implementation (prot_none faults) is rather :[

I think this series needs to greatly limit its complexity and provide
some gentle correction for LRU inversions, and I think they're making a
decent attempt at that.

But then I think local memory expansion on CXL is going pretty
swimmingly in our datacenters :], others may not feel the same.

~Gregory