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b=cGk46W7CzHl87LeGZ183G7a45BrctM3x0Us+3/mOn9K7e9MS+E6OEnH64n9FUszCk txrylxrL3gzurCwA1wyu9o329GqI1EmjsYo4h42Sl4fvy4DsaVntIWIvLRBdYK+xDV BXGcaDm/ZYJNUhmFFPMhApu3xPhHQHk0z/2Ohy8DCJrcMXFuz44RYJWRVcTFF+32G2 y/NAueKR9EOHCtqPX6VKJ17/+GtZyVBn/QJfD1Hkk9ssqTXe/BM+TqaT7W4jX8H0jW YPXNtsUZTQwJHiy2vGdrjHxb7NAgM+hvL7xGzb6IyEZVIWNNLYst/7d1Z3xHddlR7R wJk2+bKmzKqdQ== Message-ID: <837c2e83-ad5f-42f5-afef-5132e02fc19a@kernel.org> Date: Thu, 13 Aug 2026 11:11:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/Kconfig: allow user to select MIGRATION if MEMORY_FAILURE is enabled To: Xie Yuanbin Cc: akpm@linux-foundation.org, apopple@nvidia.com, bp@alien8.de, byungchul@sk.com, gourry@gourry.net, joshua.hahnjy@gmail.com, liam@infradead.org, liaohua4@huawei.com, lilinjie8@huawei.com, linmiaohe@huawei.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, matthew.brost@intel.com, mhocko@suse.com, nao.horiguchi@gmail.com, rakie.kim@sk.com, rppt@kernel.org, surenb@google.com, tony.luck@intel.com, vbabka@kernel.org, ying.huang@linux.alibaba.com, ziy@nvidia.com References: <0dc4a8da-b2e1-4eaf-bea7-070b38d6952c@kernel.org> <20260813072344.112797-1-xieyuanbin1@huawei.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: jfsab8n75r4xthi1tb7d17tj7abgbfur X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 60F101C0004 X-HE-Tag: 1786612281-886857 X-HE-Meta: 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 o2WTNeTm Y7BgyH0FtAVYEqLGiMPAIHoiFSTLzeVuqtPbfJLfuRoJAwTf6s5HtM5gxG8KLMKgkvF2URegmveF5b3+AcijN/+JPnYGqhR/xc1VtfG4h75w4hgnzqK+5ybWGQ0CWwjQQqneQOPlLX1fc6YEq7Mn+jXzsaSo0xv0e6oTmn/NI09Vresf5ggAKXXWOXUMYMeXGc3YyQYYR4yDbfUHOIAVqfDpVxgXClILjIRJvkLAQGa39zrIN4JfYx8uNHgVh474NT89k4NXjbVv9ZXLg63/9xBy/140GWDb7piPOizFqPTC3lWY9VWQuPW0SJxxrQA5S1TrLvu+xrnO8AklqTD09q18aWlNi87BFudBW5KNaTQI211z2XOFzKblxpT50SR/zfOAH Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/13/26 09:23, Xie Yuanbin wrote: > On Thu, 13 Aug 2026 09:06:07 +0200, David Hildenbrand wrote: >> Why add a new config option? > > I think this provides more flexibility in configuration, when: > CONFIG_COMPACTION=n > CONFIG_MEMORY_HOTREMOVE=n > CONFIG_NUMA_MIGRATION=n > CONFIG_CMA=n > CONFIG_MEMORY_FAILURE=y > Users can choose whether to enable migration, just like what commit > 6ebf98d71f9b509e833e ("mm: introduce CONFIG_NUMA_MIGRATION and simplify > CONFIG_MIGRATION") done. However, it does add a new config, which may > confuse the users... > > I think that just making MEMORY_FAILURE select MIGRATION is also a very > good solution, and I respect the maintainers' opinion. There must be a good reason to do something fine grained like MEMORY_FAILURE_MIGRATON, really. So if there is a use case out there that absolutely doesn't want CONFIG_MIGRATION but does want CONFIG_MEMORY_FAILURE, we could discuss it. As really only softdirty needs page migration (IIRC), we could also just put that under a separate config that implies CONFIG_MIGRATION, like CONFIG_MEMORY_FAILURE_SOFT_OFFLINE. But I'd rather avoid that unless really required. -- Cheers, David