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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8b3295c32fbsm1179032985a.33.2025.11.25.05.15.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Nov 2025 05:15:39 -0800 (PST) Date: Tue, 25 Nov 2025 08:15:37 -0500 From: Gregory Price To: "David Hildenbrand (Red Hat)" Cc: linux-mm@kvack.org, akpm@linux-foundation.org, kernel-team@meta.com, vbabka@suse.cz, surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-kernel@vger.kernel.org, Mel Gorman , Alexandru Moise <00moses.alexander00@gmail.com>, David Rientjes Subject: Re: [PATCH v2] mm, hugetlb: implement movable_gigantic_pages sysctl Message-ID: References: <20251121192746.256051-1-gourry@gourry.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: A6536100019 X-Rspamd-Server: rspam07 X-Stat-Signature: sn7agptdgf5ja4jfnacdpdszffzebtmi X-Rspam-User: X-HE-Tag: 1764076541-17351 X-HE-Meta: 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 MlFMzrWw eoENLVl/K7M6Ko0vJlNE4a7BJ3W7oljQh7rjDiQnIjWcKzSDfaJ6yJg5Ydc685VvtQFK+0hQSbTNNSHlgYy4tOnHsXS2CHg4RX9dzhDzTB+Omfu3ezm56WLukACitc7gYi4SM+iuCyhWNpAaRH6wBJZW1yQ== 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 Tue, Nov 25, 2025 at 11:24:24AM +0100, David Hildenbrand (Red Hat) wrote: > On 11/21/25 20:27, Gregory Price wrote: > > Can we also reference this parameter here from > Documentation/admin-guide/mm/memory-hotplug.rst? > Good call > In particular, there we also talk about gigantic pages and the interaction > with ZONE_MOVABLE: > > " > - Gigantic pages are unmovable, resulting in user space consuming a > lot of unmovable memory. > > - Huge pages are unmovable when an architectures does not support huge > page migration, resulting in a similar issue as with gigantic pages. > " > > And then later, we talk about "Even with ZONE_MOVABLE, there are some corner > cases where offlining a memory > block might fail:" where this should be spelled out as well. > I will take a look, thank you! > -- > Cheers > > David