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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4f4ac54adb9sm2255711cf.10.2025.12.18.13.08.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Dec 2025 13:08:28 -0800 (PST) Date: Thu, 18 Dec 2025 16:07:50 -0500 From: Gregory Price To: Zi Yan Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, richard.weiyang@gmail.com, osalvador@suse.de, rientjes@google.com, david@redhat.com, joshua.hahnjy@gmail.com, fvdl@google.com Subject: Re: [PATCH v5] page_alloc: allow migration of smaller hugepages during contig_alloc Message-ID: References: <20251218190832.1319797-1-gourry@gourry.net> <0E77F151-99B0-4F67-814A-4D79439C9A88@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0E77F151-99B0-4F67-814A-4D79439C9A88@nvidia.com> X-Rspamd-Queue-Id: 080561C000A X-Rspamd-Server: rspam03 X-Stat-Signature: e33cmxfwrm4e5g4nd49zg4nohnu4uydy X-Rspam-User: X-HE-Tag: 1766092109-500346 X-HE-Meta: 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 i7u2I1pL hQGMWWQ6lenGunJR8q989nVJ2F4pu14jktwYjTYvGrWyBHvlIJli51fdVZG+h6KvRJDVshc5hYEN03oQRfg3Hb3nq7ajZAoN7Dt8mVW5HHroMUOyzWLVqDE7SG4GtmePXeaz21t35kFAaB++XIjCFD6oGvSYFLUpOFLtI40NxuDlezy8OKJMXs5Yb9DrKZbd/UFTzwbk9TUJXBLvQr0A/JQYM5X9FF7KVDakUuXpiBZw12hqO5usvSgFIgf2C3v4ox+QbOD6Rjo6IKoC/Zqr4Bsdwv2/x3HxAtgTUMSh1vAqM+OeHzlDbLqvVr/3q/1KNyrp/FovMtHzrf6jpBaa+ujm0F2TNyUr/5IikqkxjCc4aKdAfIdfxj3qjwzBov7ZI1TJFIqlL0SDyD7pADHD2NOsFJp5m/Kp1oqUu/BpxxJ9I7oiCZgsQK4v6R6cVuWaPy1l+ 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 Thu, Dec 18, 2025 at 02:45:37PM -0500, Zi Yan wrote: > On 18 Dec 2025, at 14:08, Gregory Price wrote: > > Why not do hugetlb search when non-hugetlb fails in pfn_range_valid_contig() > and give hugetlb_search result in an input parameter? Something like > Short discussion with Johannes - it's not worth trying to do any kind of filtering, but we can at least optimize for the case where we don't actually find any hugetlb regions (preventing a retry for no reason). So I'll ship a v6 with a mild improvement. ~Gregory