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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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0E77F151-99B0-4F67-814A-4D79439C9A88@nvidia.com> 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