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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-87cf521be67sm53378076d6.16.2025.10.20.09.05.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Oct 2025 09:05:43 -0700 (PDT) Date: Mon, 20 Oct 2025 12:05:41 -0400 From: Gregory Price To: David Hildenbrand Cc: linux-mm@kvack.org, osalvador@suse.de, corbet@lwn.net, muchun.song@linux.dev, akpm@linux-foundation.org, hannes@cmpxchg.org, laoar.shao@gmail.com, mclapinski@google.com, joel.granados@kernel.org, jack@suse.cz, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Mel Gorman , Michal Hocko , Alexandru Moise <00moses.alexander00@gmail.com>, David Rientjes Subject: Re: [RFC PATCH] mm, hugetlb: implement movable_gigantic_pages sysctl Message-ID: References: <20251009161515.422292-1-gourry@gourry.net> <6fe3562d-49b2-4975-aa86-e139c535ad00@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6fe3562d-49b2-4975-aa86-e139c535ad00@redhat.com> X-Stat-Signature: s3g118mhzx6srt6zrzr3jfa3oi7t3t3r X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: F026C40012 X-HE-Tag: 1760976344-281552 X-HE-Meta: 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 WdPqBs0t 2xf5QvfCk0GRw6eGdkzEN3DxYavu6XQVQBjR0uj3VsoTkg/XTs4g4LCZkd6ibzxvo9PkhrEHvRrucK/igUNfxYM5N4ymiPFxKwa2iuQoYBw/cSzwdckkv1dWt0DMJHnqtUf2yCksyHMVBQ/LCcULXyUo6KEWcjzTmVSzPw2R3niuKKrKhe9wxiS/dsnO8S9EP8FTwMJkSi1IsiinEaKC66l3zVSFtAxmy2aZocGqnPmOg0C/UUberryFxS441XCAk9bsPudRyY34LOpyMrlDZZ66VIcyhHjhBZQFzg5g4GgLisjo5+co1HqH0mTUSvokvHJ9I8Ph9ZZlwN/ldVKrhNtb1292s7gBIg1qbAJnoQvX0/DKVvi05H1V5Q/g6kuEoXFdTVr64l81vz9mK5TFkIms7Kb3TlLgFwCDfyXV5xxUW8SGY52loyEUzvlbGI1BfEO1Yslyv0XovZhV3wQmUWQzpJoGjdGi/qOCesbwrT1YJbK4= 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 Mon, Oct 20, 2025 at 04:17:06PM +0200, David Hildenbrand wrote: > On 09.10.25 18:15, Gregory Price wrote: > That could be supported by allowing for moving hugetlb folios when their > size is small enough to be served by the buddy, and the size we are > allocating is larger than the one of these folios. > I think this is roughly what you'd be looking for? ~Gregory --- diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 5549b32cdd31..5def2c53092e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6922,8 +6922,12 @@ static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn, if (PageReserved(page)) return false; - if (PageHuge(page)) - return false; + if (PageHuge(page)) { + /* Don't consider moving same size/larger pages */ + if (!CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION || + ((1 << compound_order(page)) >= nr_pages)) + return false; + } } return true; }