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AJvYcCX5NeMTG4mAvcPF8t+ZQGnDXsUWL9PqNV9RwEzolOF2AQQomN6XpxZt053ag5P5m6spMVtnk1Lgtw==@kvack.org X-Gm-Message-State: AOJu0YyFMpFwxdHePEmpn1FjoRaiZzibO8+FhWRWeuj7V9WD4Y4EEQwS M1Qc048NHMdeos5pHkWZBlJBR9TZe1mw91D7FstnwYNpVA2O5k77z0FnUDI0JckbZnW9OHkuQQx Gntp9gRVBcT/QlLV+PcE/8Pc4HR/Ir3o= X-Gm-Gg: ATEYQzw8b0921Zr1qXBOHmzZ4gfdcCtvrHBIa84k2n7LxDFnIE23fNVqCYbRVgOWldl ffafMhaX3Crre6pNOo+opcyhxueUsDyO68IbHZLVL7K3ax38hiHBndNHQyK5cposG4NEdTa0rxU a9LGLxfRtzkPhU9x2ZkZ4IYbyC1jtFUU5/uzgOIlc1pvTfrnF7BWiktND5INqT+RvR7qL5yw2qS oGk1QcMn7/Myt4veCfRxAw47DngWap9tbfLPG1zm1N6UrqUlQNIKg3SrxzOv5iUL2DlFzCqxlS+ gOdCvwA= X-Received: by 2002:a05:6830:3895:b0:7d7:d2f5:1d61 with SMTP id 46e09a7af769-7d9fadcaa65mr1412844a34.4.1774622239937; Fri, 27 Mar 2026 07:37:19 -0700 (PDT) MIME-Version: 1.0 References: <20260327055846.248829-1-mikhail.v.gavrilov@gmail.com> In-Reply-To: From: Mikhail Gavrilov Date: Fri, 27 Mar 2026 19:37:08 +0500 X-Gm-Features: AQROBzCwIuxZlwe-ZTEq4hn8TNXRa68NgSRLtpj4ujZXiYxMYZMii3XpyteXFcM Message-ID: Subject: Re: [PATCH] mm/slab: align kmalloc to cacheline when DMA API debugging is active To: "Vlastimil Babka (SUSE)" Cc: Marek Szyprowski , Catalin Marinas , harry.yoo@oracle.com, akpm@linux-foundation.org, hao.li@linux.dev, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, linux@roeck-us.net, andy.shevchenko@gmail.com, hch@lst.de, Jeff.kirsher@gmail.com, Robin Murphy Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 1CA9880014 X-Stat-Signature: n8smn364ezgbtyb6fumdnek5x78upozc X-HE-Tag: 1774622240-536242 X-HE-Meta: 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 cwzLRhB1 x5ovBrBaPwLvCBECSPSxEzx8H0C/7gI84S4HpMFsM19c7rH6xGUliWnxgPykgyyUgIPf2LiQUoUfMHImoiSDpP/p4Drum8tSEy5Dh5xyD5HFBpKVdNrPREiTxDBiBF+ihTvQZgZtdYXvve+WQZ850LuhtdEig3mvHxQHSQ93Qk1Ll1WFXxZjQgImIb4MMqefMgFWkVlr3E1cWR/S1TEnL/eRa4KjlgsRebzxt7wVjUf3473YUkMDnpdeSdO5ZBwSjf07P91y08+zUq6wkHgpDVv0OBU8bsGHbe/b46TmHFtX4wH483jALoFYEhs5mA3nt94UCAS7yRgyi1MW05O+3Kaf+THFVbNeHtYyTrEtk37kSClh92E+maiQDL/gEP9xZfDH0KgJG4sDM+UeYaW6YRUoHQM8/D1zvrXHjhKcMR9DtZNmlUfbMSyWL/QNJH6gaba8z8E4DH30EN7qWboiQuyI65vxWisnYZER8cN3Ff4CyXiDZSItDKGE9D5y3ogGnnY/H Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Mar 27, 2026 at 7:30=E2=80=AFPM Vlastimil Babka (SUSE) wrote: > > So what about Harry's proposal [1]? Mikhail seems to be on board? [2] > > It seems it would achieve the goal that enabling DMA_API_DEBUG doesn't > change the kernel behavior? But I don't know this area too well so > maybe there's a catch. > > [1] https://lore.kernel.org/all/acYlxRBhSMcwBnja@hyeyoo/ > [2] https://lore.kernel.org/all/CABXGCsO_C8%2B%2B4%2BoPfZ%2BbQyrBnEGy5JFp= XHkGNpfy%2B8%3D5BvVNfg@mail.gmail.com/ Hi Vlastimil, Yes, I've already sent v2 based on Harry's suggestion: https://lore.kernel.org/all/20260327124156.24820-1-mikhail.v.gavrilov@gmail= .com/ It adds a dma_get_cache_alignment() >=3D L1_CACHE_BYTES check in add_dma_entry() instead of changing ARCH_KMALLOC_MINALIGN, so enabling DMA_API_DEBUG no longer affects allocator behavior. --=20 Best Regards, Mike Gavrilov.