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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4e55a34c6e5sm170740411cf.6.2025.10.08.12.44.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Oct 2025 12:44:05 -0700 (PDT) Date: Wed, 8 Oct 2025 15:44:03 -0400 From: Gregory Price To: David Hildenbrand Cc: linux-mm@kvack.org, corbet@lwn.net, muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, hannes@cmpxchg.org, laoar.shao@gmail.com, brauner@kernel.org, mclapinski@google.com, joel.granados@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Mel Gorman , Michal Hocko , Alexandru Moise <00moses.alexander00@gmail.com>, David Rientjes Subject: Re: [PATCH] Revert "mm, hugetlb: remove hugepages_treat_as_movable sysctl" Message-ID: References: <20251007214412.3832340-1-gourry@gourry.net> <402170e6-c49f-4d28-a010-eb253fc2f923@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: qwzqzn41614qynkhkk5pbfuyauz4z6po X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 507CE1C000F X-HE-Tag: 1759952647-12069 X-HE-Meta: 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 11lRF3Gw Oig6ivTpl7egMsiobXsJNxFre+Jy6K92vDMX+J4cFnJRp++Zi29q8RVrJHEDrnDVo6dr9/kVU5ZEXDGY9jm6cv1iWZrSCvQyZXSEBMddw2lNQhiMimgV1fpoVwbE8Gb6UCd5Uc+8lwqj3oUJzvHS+9shPSUD2kRNcT9LoauCcRmwMZr4LwKVqoHF6VxzYOT+bOWaKGukk4WzpSblb/Wv3Uxfg2MpFyuQU1Nnh1KocxvT8DKLRwKY06lihqMYU08cN2DjyJq7aGCTPp+OeRH5bv2qqzdvPj4/8nc2Z1u0kaGQ0YcpRiC9FSea3GRl8i7xLEMmsC9kfForiaeC+oqIdxLgRJCoxEOD8NzKO9diBCA1wrsrvWa59qgKGKAU9j5C/VIn7Nb8ArTMibh3UCd9zUcz0k3d1dYyAQIQweoeHiP5EDT4JCdUimqrVcwTKzVD7vBjg 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 Wed, Oct 08, 2025 at 09:01:09PM +0200, David Hildenbrand wrote: > > > > fwiw this works cleanly. Just dropping this here, but should continue > > the zone conversation. I need to check, but does this actually allow > > pinnable allocations? I thought pinning kicked off migration. > > Yes, it should because longterm pinning -> unmovable. > You know i just realized, my test here only works before I allocated 1GB pages on both node0 and node1. If I only allocate 1gb hugetlb on node1, then the migrate pages call fails - because there are no 1gb pages available there. I imagine this would cause hot-unplug/offline to fail since it uses the same migration mechanisms. Worse I would imagine this would fail for 2MB. Seems like the 1GB limitation is arbitrary if 2MB causes the same issue. ~Gregory