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

Balbir Singh
2026-05-05T22:18:00Z

On 5/5/26 06:36, 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.
>

I am unclear about the benefits of the patchset, I have not tested
it or reviewed the latest revision. My big concern was that top-tier
might not always be suitable.

I see that there are some numbers posted, but I find this weird
"After the graph creation, the processes are stopped and data is migrated
to CXL node 2 before continuing so that BFS phase starts accessing lower
tier memory." Why not allocate everything on CXL node 2?

Balbir