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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c7a8a0e6ddsm329175385a.107.2025.04.11.17.09.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Apr 2025 17:09:57 -0700 (PDT) Date: Fri, 11 Apr 2025 20:09:55 -0400 From: Gregory Price To: Matthew Wilcox Cc: linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, donettom@linux.ibm.com, Huang Ying , Keith Busch , Feng Tang , Neha Gholkar Subject: Re: [RFC PATCH v4 0/6] Promotion of Unmapped Page Cache Folios. Message-ID: References: <20250411221111.493193-1-gourry@gourry.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Sat, Apr 12, 2025 at 12:49:18AM +0100, 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. This wasn't a statement of approval page cache being on lower tiers, it's a statement of fact. Enabling demotion causes this issue. ~Gregory