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Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1w3dwK-000000088lh-00QQ; Fri, 20 Mar 2026 17:47:16 +0000 Date: Fri, 20 Mar 2026 17:47:15 +0000 From: Matthew Wilcox To: WANG Rui Cc: usama.arif@linux.dev, Liam.Howlett@oracle.com, ajd@linux.ibm.com, akpm@linux-foundation.org, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, brauner@kernel.org, catalin.marinas@arm.com, david@kernel.org, dev.jain@arm.com, jack@suse.cz, kees@kernel.org, kevin.brodsky@arm.com, lance.yang@linux.dev, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.l, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, mhocko@suse.com, npache@redhat.com, pasha.tatashin@soleen.com, rmclure@linux.ibm.com, rppt@kernel.org, ryan.roberts@arm.com, surenb@google.com, vbabka@kernel.org, viro@zeniv.linux.org.uk Subject: Re: [PATCH v2 3/4] elf: align ET_DYN base to max folio size for PTE coalescing Message-ID: References: <20260320140315.979307-4-usama.arif@linux.dev> <20260320160519.80962-1-r@hev.cc> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260320160519.80962-1-r@hev.cc> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5E69240006 X-Stat-Signature: rz4jik8q61bdxpbicu56xs145joc8fdo X-Rspam-User: X-HE-Tag: 1774028850-545769 X-HE-Meta: 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 7Huz5jwz 9Z8feYuElr4YmxpMQ06Wwfz/rivOiEVWc/HOBR5fPntdxrThqfxm0udz0kB/xzZSxRLsM7qgZ1ewx07gmzlp2InCaKrlMhOcjGjDUNby+I45S60y5b9FOMV/MiNCbNIGFtoODlCOjOJ4mGLBlaRSQ7wyPRSg438uG0cog7PjJVcylHDLTBPyIjWIKU1rnHCTiEFi1k2K76RqSjzJCA9QTGpFmvQD4E033lQGlM4k+nV+A9pHti1uMFDbcjPWLZlvAFDxwBCNwR1+Zi00y9fV9sjzxDaqDVK3jRrZ2YZiCqs3MQI4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, Mar 21, 2026 at 12:05:18AM +0800, WANG Rui wrote: > >From experiments (with 16K base pages), mapping_max_folio_size() appears to > depend on the filesystem. It returns 8M on ext4, while on btrfs it always > falls back to PAGE_SIZE (it seems CONFIG_BTRFS_EXPERIMENTAL=y may change this). > This looks overly conservative and ends up missing practical optimization > opportunities. btrfs only supports large folios with CONFIG_BTRFS_EXPERIMENTAL. I mean, it's only been five years since it was added to XFS, can't rush these things.