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Tue, 27 Jan 2026 13:35:55 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id JIxxNDu/eGmREgAAD6G6ig (envelope-from ); Tue, 27 Jan 2026 13:35:55 +0000 Date: Tue, 27 Jan 2026 14:35:54 +0100 From: Oscar Salvador To: Li Zhe Cc: muchun.song@linux.dev, david@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] hugetlb: increase hugepage reservations when using node-specific "hugepages=" cmdline Message-ID: References: <20260122035002.79958-1-lizhe.67@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260122035002.79958-1-lizhe.67@bytedance.com> X-Rspamd-Action: no action X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 4A436C0008 X-Stat-Signature: 7bm36rcxsgejgh5fhec9r8m9oabmh8sc X-HE-Tag: 1769520959-680095 X-HE-Meta: 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 uqDS2/zl HG2z8tMK5UqK9X7v8YvD2+VgBkoRY9RzdO/5AwQ5G+KF8FQsobhASPumLd7gqZjTjuWlmJMw6qAfG0bPfdmF+PwVGqmOxMJsgfHkABQ2zMNhZhbuwDLDQ17Efn49H/BUwIVYp6bjh2PACZshKyBkRvkrFMb2N6uJWa5lG47dddkDvJD69RquqYwxTxA7GOsYAanrsDMHh95+2o/0M36KfelJ/QXCGJOiBzl0Lmrx9b+qZGgl350On1Nqxmsyn1z3L6Cgl9dh8BTERZsmnYfkdwFsG7U7fnrgxPJ/9 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 Thu, Jan 22, 2026 at 11:50:02AM +0800, Li Zhe wrote: > Commit 3dfd02c90037 ("hugetlb: increase number of reserving hugepages > via cmdline") raised the number of hugepages that can be reserved > through the boot-time "hugepages=" parameter for the non-node-specific > case, but left the node-specific form of the same parameter unchanged. > > This patch extends the same optimization to node-specific reservations. > When HugeTLB vmemmap optimization (HVO) is enabled and a node cannot > satisfy the requested hugepages, the code first releases ordinary > struct-page memory of hugepages obtained from the buddy allocator, > allowing their struct-page memory to be reclaimed and reused for > additional hugepage reservations on that node. > > This is particularly beneficial for configurations that require > identical, large per-node hugepage reservations. On a four-node, 384 GB > x86 VM, the patch raises the attainable 2 MiB hugepage reservation from > under 374 GB to more than 379 GB. > > Signed-off-by: Li Zhe Acked-by: Oscar Salvador -- Oscar Salvador SUSE Labs