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Wed, 17 Dec 2025 20:51:06 -0800 (PST) MIME-Version: 1.0 References: <20240717071257.4141363-1-ryan.roberts@arm.com> <873458zzg9.fsf@linux.intel.com> In-Reply-To: <873458zzg9.fsf@linux.intel.com> From: Barry Song <21cnbao@gmail.com> Date: Thu, 18 Dec 2025 12:50:54 +0800 X-Gm-Features: AQt7F2o2k4t0qBQRakEhfvbpSXVxQEeopZF5RsemRA27XRf-wUY3EYtQ308SMWU Message-ID: Subject: Re: [RFC PATCH v1 0/4] Control folio sizes used for page cache memory To: Andi Kleen Cc: Ryan Roberts , Andrew Morton , Hugh Dickins , Jonathan Corbet , "Matthew Wilcox (Oracle)" , David Hildenbrand , Lance Yang , Baolin Wang , Gavin Shan , Pankaj Raghav , Daniel Gomez , linux-kernel@vger.kernel.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: cky8t1ktk4orzfc3gk376bw58o9ynye4 X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 20EB22000A X-HE-Tag: 1766033467-419344 X-HE-Meta: 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 l7D8zfyC DWBA/eqeKst89cUrDEDmSIDPgq59MV7TODNVB9j84eyb7+xwqHuwl1gxcuz5mg0tHupHykpsnJ54t7aXF9NdNEEy8WXX+SEzyWCkSLGCuHhXwGdsyD8JxpYT1gd7MALrr7mlMlWquBAoJuQFLFG2JgKFgl0R5sgeLPkQKC4a0L+oZiWoc4w1KNE0NC7KWUFYHolrzpzG1LqlOBgoXqMcUYp9pT3O9Muzk/tj8ZxLHQAMLH3sLogy/aVS5To1p6nnCMbMUfkP6GOu/IHciTZ9ajvhTKGQnMy7qi/28Ftj8XySmNYqzFKEgDGb9uCLpAGYMgHMHOcmBXwrOVyqW7gOdwR+FhTtoul7sSUJfYgdix2+w4eRyI0zOrmGgomsfQoOYi8zZe0B9tUcNPnlSie6LZGAJMfveYVfs0AcbPjc+ziNpFnarY/Sd6770eEQukCY5mKbpieMpSoVUbET0lwvXweDbJw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Dec 18, 2025 at 3:21=E2=80=AFAM Andi Kleen wrote: > > Ryan Roberts writes: > > > Hi All, > > > > This series is an RFC that adds sysfs and kernel cmdline controls to co= nfigure > > the set of allowed large folio sizes that can be used when allocating > > file-memory for the page cache. As part of the control mechanism, it pr= ovides > > for a special-case "preferred folio size for executable mappings" marke= r. > > > > I'm trying to solve 2 separate problems with this series: > > > > What happened to this patchkit? I was looking into how to efficiently > get larger pages for text transparently, and there doesn't seem > to be anything better than such a heuristic? I do feel that we need some controls over file folio sizes. It could also be implemented using an eBPF-based approach, such as [1]? [1] https://lore.kernel.org/linux-mm/20251026100159.6103-1-laoar.shao@gmail= .com/ Thanks Barry