Re: [RFC PATCH v4 0/6] Promotion of Unmapped Page Cache Folios.

[Matthew Wilcox]

On Sun, Apr 13, 2025 at 10:53:48AM +0530, Donet Tom wrote:
> 
> On 4/12/25 5:19 AM, Matthew Wilcox wrote:
> > On Fri, Apr 11, 2025 at 06:11:05PM -0400, Gregory Price wrote:
> > > Unmapped page cache pages can be demoted to low-tier memory, but
> > No.  Page cache should never be demoted to low-tier memory.
> > NACK this patchset.
> 
> Hi Mathew,
> 
> I have one doubt. Under memory pressure, page cache allocations can
> fall back to lower-tier memory, right? So later, if those page cache pages
> become hot, shouldn't we promote them?

That shouldn't happen either.  CXL should never be added to the page
allocator.  You guys are creating a lot of problems for yourselves,
and I've been clear that I want no part of this.
>