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b=cwb2Vl3kw9B1Yir0mxFjBBURXZlilfgRyuUYMiigWxIRGDyiH/388LhuNWxlUSJhO l7848zEObF1rOs8l9B8j+adstLF2PkfshMZKvtDNsPxhlNqLRD8dAfe1yLQdFWG26F 7sFqZ0GDboY0G2KCcxJnHSRrA3ERO/Zgnbqbv1x9UPtDRMH0qUK3Eg5ZWDQZjp7tW6 4BDMFXllHZrkwMwEs/WQEel5Xao1HDIpV5grS7YI50zjkv7CBQolEG57uW5e6oqp2v OldPhFQ6qiCA9o2/4iYm+X1UPYg/5zk9OsD6ZDxp9N5kxgWDMAGiUak1Uk7YRd3Icw Rvrl6Kc36s0ug== Message-ID: Date: Tue, 7 Jul 2026 15:47:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 04/12] mm/memory: Batch set uffd-wp markers during zapping To: Dev Jain , akpm@linux-foundation.org, ljs@kernel.org, chrisl@kernel.org, kasong@tencent.com, hughd@google.com, liam@infradead.org Cc: riel@surriel.com, vbabka@kernel.org, harry@kernel.org, jannh@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, shikemeng@huaweicloud.com, nphamcs@gmail.com, bhe@redhat.com, youngjun.park@lge.com, baolin.wang@linux.alibaba.com, pfalcato@suse.de, ryan.roberts@arm.com, anshuman.khandual@arm.com References: <20260526063635.61721-1-dev.jain@arm.com> <20260526063635.61721-5-dev.jain@arm.com> <562addc1-b334-4258-b0d2-0154ffed061b@arm.com> <0654116a-235d-4eb0-9970-414322645aa3@arm.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-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7D63840003 X-Stat-Signature: zb7mabh6zywgcw83347t5ixkan9b153z X-HE-Tag: 1783432086-981464 X-HE-Meta: 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 8VRwHu9i qD/auhWaqnA6vJwH6SBB7NTmySpV7GQnqsaf4MxenYvvJQJp/dIIsA7bX8LenRuS0WpCAX/3dZBBbZU/DfuTo6DOM7R2UGY3QIyGiNek/baEASP+FZ2vs9Rw9sfTS6fWUqCszwuzCLhfv82RwJRuXfn025jO88+Uz31PbzIIM9lBEuTkz9ZZIl3winiDvEBJQegZnft+SxIXWBMnKMFyi98q9960BLTJxbuaaS8klOBS0CBt47rBlbdks93ltOrgqHLmW Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/27/26 11:00, Dev Jain wrote: > > > On 23/06/26 3:31 pm, Dev Jain wrote: >> >> >> On 16/06/26 7:13 pm, David Hildenbrand (Arm) wrote: >>> >>> Avoid talking about "next patch". Phrase it as "In preparation for batching...". >>> >>> >>> Below you have >>> >>> >>> Could we easily extend set_ptes() to allow for non-present -> non-present with >>> nr > 1? >> >> We could have a set_nonpresent_ptes() in general, but then for some non-present >> configs like in this patch, we don't need to change the pfn, while in some >> configs like setting swp ptes in one go (like I do in later patches) we have >> an underlying pfn. So I don't see an obvious simplification with a common >> helper for non-present -> non-present for nr > 1. > > I think a "non-present" entry always means a softleaf? In that case, we can > simply branch on softleaf_has_pfn(). We could, but it might turn the overall function more expensive by throwing in additional runtime checks that the compiler will not really optimize out. Worth playing with. -- Cheers, David