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Thu, 22 Oct 2026 13:55:05 +0000 X-Mizu-Trace-ID: 96abd4a0ca655602 X-Migadu-Flow: FLOW_OUT From: Lance Yang To: songmuchun@bytedance.com Cc: osalvador@suse.de, akpm@linux-foundation.org, rppt@kernel.org, qi.zheng@linux.dev, lance.yang@linux.dev, jthoughton@google.com, david@kernel.org, muchun.song@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 04/12] mm: hugetlb_vmemmap: generalize vmemmap page allocation Date: Thu, 22 Oct 2026 21:54:55 +0800 Message-ID: <20261022135455.90168-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261020115824.823278-3-songmuchun@bytedance.com> References: <20261020115824.823278-3-songmuchun@bytedance.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 2C780100005 X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Stat-Signature: ysbrjwwbr3hpqx3z9ud569hkrpwy3qkt X-HE-Tag: 1792677310-200228 X-HE-Meta: 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 /4LZoWzY 6pv+I4dlZXTon350Ya41hjb9UfMbGJXZCGldiFiQV0MtDCfHhD4ygUVdSbF37G4aC6yCD1bkQa6rIGyZWvQDB8jxO2srqYp55RB6xBbQz3buwv8kuUPHXXMuPqpUV1vF0bT6h91YVWrFTsDi5dNEf+qGxLkFfG02uimxrzcicuozOQQcfqXh7Iup+/NT6Z0bpQB2gL8pg0DIcIBlVo9VMWzuwcJ690DGyNluEv35K6a2THtU6r2PL6LtWrfW94SqZF508MXeQXvnVOPH5kPD0MifB12yDn1U4DTpCrHH13p3MboXhvS50sNnVkFv7mWZII4siYGEMCqXHdEE= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Tue, Oct 20, 2026 at 07:58:16PM +0800, Muchun Song wrote: >Vmemmap page allocation is currently tied to restoring a virtual range >and assumes an empty destination list. These constraints prevent it from >being reused when pages are requested independently of a vmemmap range or >appended to an existing list. Yeah, the local list makes sense to me :) >Generalize the allocator and give it an all-or-nothing list contract so >the restore and optimization paths can share the same allocation policy. >This also allows HVO head-page allocation to fail gracefully under memory >pressure without triggering the OOM killer. And __GFP_RETRY_MAYFAIL for the head page seems reasonable too. Just skip the optimization if we can't allocate it. >Signed-off-by: Muchun Song >--- Reviewed-by: Lance Yang