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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4587054f338sm190876065e9.13.2025.07.29.05.42.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Jul 2025 05:42:23 -0700 (PDT) Message-ID: Date: Tue, 29 Jul 2025 14:42:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH] mm/page_alloc: Add PCP list for THP CMA To: "akash.tyagi" , ziy@nvidia.com, surenb@google.com Cc: akpm@linux-foundation.org, vbabka@suse.cz, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com, chinwen.chang@mediatek.com References: <20250729123028.1224786-1-akash.tyagi@mediatek.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <20250729123028.1224786-1-akash.tyagi@mediatek.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: KDsSfKJKD1gaOFWF_NLXKhEF_SCX-NJGTjmxVmde_OI_1753792944 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: AD2A9A0005 X-Rspamd-Server: rspam06 X-Stat-Signature: ob6ar1puwj74m8sekhuyuhmyd8w3oxdt X-HE-Tag: 1753792947-847545 X-HE-Meta: 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 NPkFRBS7 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 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 29.07.25 14:30, akash.tyagi wrote: > On Fri, 25 Jul 2025 at 10:27, Zi Yan wrote: >> But there is this known problem that CMA can fail temporarily due to >> short-term pinnings. See the "reliable CMA" work (don't remember the exact name). >> I think you mean Guaranteed CMA[1]. >> >> [1] https://lore.kernel.org/linux-mm/CAJuCfpEWVEqsivd7oTvp4foEho_HaD1XNP8KTeKWzG_X2skfGQ@mail.gmail.com/ >> >> Best Regards, >> Yan, Zi > > > Hi, > > Yes, the issue I described is actually related to Guaranteed CMA[1]. > > I have rewritten our problem statement to address concerns more specifically related to the Android common kernels. > > Problem statement: > Android Common kernels usually have an out-of-tree patch to prevent file-backed page allocated from CMA. > It allows some allocations which have lower chance of being pinned to use CMA to improve CMA utilization controlled by a flag __GFP_CMA. > https://lore.kernel.org/lkml/cover.1604282969.git.cgoldswo@codeaurora.org/ > > > Additionally, android kernels create cma pcp list for pages less than PAGE_ALLOC_COSTLY_ORDER, but not for THP pages. I'm afraid you have to fix this in the android kernels. -- Cheers, David / dhildenb