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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> 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: 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