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Sun, 01 Nov 2026 06:51:53 +0000 X-Mizu-Trace-ID: 43a291ed986079d8 X-Migadu-Flow: FLOW_OUT Message-ID: <2fb322ca-d54f-465e-b342-cb4e3ce55621@linux.dev> Date: Sun, 1 Nov 2026 14:51:47 +0800 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 05/12] mm: hugetlb_vmemmap: unify writable vmemmap page preparation To: Muchun Song , Oscar Salvador , Andrew Morton , Mike Rapoport Cc: Lance Yang , James Houghton , David Hildenbrand , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20261020115306.813483-1-songmuchun@bytedance.com> <20261020115824.823278-1-songmuchun@bytedance.com> <20261020115824.823278-4-songmuchun@bytedance.com> From: Qi Zheng In-Reply-To: <20261020115824.823278-4-songmuchun@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9D236140004 X-Stat-Signature: gosx13kz99hsnxncbsxz845jeuf6dd9g X-Rspamd-Server: rspam06 X-Spam-Status: No, score=-17.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1793515914-285394 X-HE-Meta: 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 pvFRQqWo L2m9uu0jRLIYYYtGkTj2e06Yapv5n5BK5rItdCRL3ymsh5odX2FbXTwcccePkTXfmu8ByG7EfrtwA3ipbpXNQGplOQEXtI0hWxWBbDMzugTiwbHyUV0U2NUmH8Yx26Z/qLa3dI3SdIL2eRr175+zG6UCwIIV6G9uB/Jxo9M+LuTYEY4wCJ/KPQw+72Mn4jn0nm9a737+kWDSvzUeeuwq1ledjx+0FrKFNc9OaCFwg8GhB797rZhBy/4rfrS8BkP/VXw+UidsWSo4qC/2CCj9NSwKJnr3yX9viObs+mp6XAA8toDVlzzz8C5+hHMfhNI3US8Me0xhkIpUcnSjzfbPxegc8KQ== 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 10/20/26 7:58 PM, Muchun Song wrote: > Installing a writable vmemmap page requires consuming a replacement page, > copying the current contents into it and making the copy visible before > publishing the new mapping. HVO currently splits this sequence between > the page-table walker and its caller depending on the remap path. > > Centralize the sequence in the walker so all writable replacements follow > the same copy-and-publish protocol. This keeps page preparation with the This makes the copy-and-publish protocol much more solid and easier to reason about. Nice cleanup! > mapping update and removes path-specific handling from higher-level HVO > code. > > No functional change intended. > > Signed-off-by: Muchun Song > --- > mm/hugetlb_vmemmap.c | 40 +++++++++++++++++----------------------- > 1 file changed, 17 insertions(+), 23 deletions(-) > Reviewed-by: Qi Zheng Thanks, Qi