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AJvYcCUtFBsSF3OkdbsaBM5s8s5EZ6auFb/V1KJgi7VpoHjySeaPHxm5sdSjU2MR12Qrx0fju4LQkZP51A==@kvack.org X-Gm-Message-State: AOJu0Yzx8Xfkx6g7B8GJrMtpFcaA7JxsLEnA2n6yMi75RWGKsGwQqgAA tEPLrfex2aO9iQus57BvVzUfbcwtymDZKcyeeYPdnhxf5X2aNR0Wl39OrtjVYALjHIEf690+Q1r V2Dfc3ScYBQrJaTBA/UEQz5L5PTacNDSSTu6n X-Gm-Gg: ASbGncsZ1APqagDE5AxmG4ctUfGpZkGSQUJ0g0o9CRdfJgVHmpEdo4kNbDyt0v5/IET X5lIWlCGx2HghaYRzlQr3pTbP9+W16gkYTEwmOUi7uYO8bMhk2baFckR/f5YKDyFMX4b/OdukBV 60Y1a63LYeum5FqTD+dHIpf+HWBtRPYubXJxJ5D20XRInDFkOlTau7WIAELMi3EKkm1Q== X-Google-Smtp-Source: AGHT+IEABWhD44MNjd25Nwa4A7Nm8LFtjVaBcJRjwZJAzXYNaj9wKDcCI9e1aiwC4/RYXDL+3xjsgQVqDX38dbN1Rb8= X-Received: by 2002:ac8:5a42:0:b0:48a:7cd7:7e21 with SMTP id d75a77b69052e-490f5fc02d1mr521281cf.20.1746471516083; Mon, 05 May 2025 11:58:36 -0700 (PDT) MIME-Version: 1.0 References: <20250501052532.1903125-1-jyescas@google.com> <20250502113733.GA29622@willie-the-truck> In-Reply-To: <20250502113733.GA29622@willie-the-truck> From: Juan Yescas Date: Mon, 5 May 2025 11:58:24 -0700 X-Gm-Features: ATxdqUG-Wvi24xlhQTEXoMOm0zo_oHKG_ly7RZJQAmPNvApha_BnNHX2sd_q3Mc Message-ID: Subject: Re: [PATCH] mm: Add ARCH_FORCE_PAGE_BLOCK_ORDER to select page block order To: Will Deacon Cc: Matthew Wilcox , Catalin Marinas , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, tjmercier@google.com, isaacmanjarres@google.com, surenb@google.com, kaleshsingh@google.com, Vlastimil Babka , "Liam R. Howlett" , Lorenzo Stoakes , David Hildenbrand , Mike Rapoport , Zi Yan , Minchan Kim Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 30313140013 X-Stat-Signature: uztut9c31hpnchofa5q65tpk5x4zxq1o X-HE-Tag: 1746471517-428900 X-HE-Meta: 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 5wgUw+Gb m3ecdDZLktMYebgK2yNJ1JTfuXMMES52/xTcGYyz/9fEWhHW9h0tf14pBiM1ctPFVVi3kqaljDVXRe8kZRq2I7AZtXxAsTrpsPUKFUrDZ2s2RQZPM8Lhqz5xkgGjJTZ7bh4vj7TIuV7YDIzSQxclIotanFxlkDifzPiAZWaiv1pM6uSCB3MtK+hNsAq4hATmBVj2nkFNMRwAyJtf+ARfLWmOlwPtO8aqchrGWczgrVXXZk7UB8VEN1YUjJR8RWyhRJTcY97feMfDpLbX3QHutkKfaalV7+fow25vHxyxev3MlhsAaijVhchKHzw== 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 Fri, May 2, 2025 at 4:37=E2=80=AFAM Will Deacon wrote: > > On Thu, May 01, 2025 at 07:38:13PM +0100, Matthew Wilcox wrote: > > On Wed, Apr 30, 2025 at 10:25:11PM -0700, Juan Yescas wrote: > > > Problem: On large page size configurations (16KiB, 64KiB), the CMA > > > alignment requirement (CMA_MIN_ALIGNMENT_BYTES) increases considerabl= y, > > > and this causes the CMA reservations to be larger than necessary. > > > This means that system will have less available MIGRATE_UNMOVABLE and > > > MIGRATE_RECLAIMABLE page blocks since MIGRATE_CMA can't fallback to t= hem. > > > > > > The CMA_MIN_ALIGNMENT_BYTES increases because it depends on > > > MAX_PAGE_ORDER which depends on ARCH_FORCE_MAX_ORDER. The value of > > > ARCH_FORCE_MAX_ORDER increases on 16k and 64k kernels. > > > > Sure, but why would any architecture *NOT* want to set this? > > This seems like you're making each architecture bump into the problem > > by itself, when the real problem is that the CMA people never thought > > about this and should have come up with better defaults. > > Yes, I agree. It would be nice if arm64 wasn't the odd duck here. You'd > think Power and Risc-V would benefit from similar treatement, if nothing > else. > > Will Thanks for the comments, I sent the v2 version with the changes: [PATCH v2] mm: Add ARCH_FORCE_PAGE_BLOCK_ORDER to select page block order Thanks Juan