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b=oGOYkD+73TN7zSPRmbSG3AbS2Mt2Gp652nhq93jzi+itj9o42TeXKkvkl4vxru63q wZabVdMTzdlf+BX8HaEdz/2lBPHLydCE+fd41NmhTfwzdacmc35DVffsf3dOID9vjg ayCsp9nHhn8Nh0sEw4yml+53cw7PMAS6eSu0R1tQhD2BcZcJVggd6PSFSdPmKdOz63 3M7PsH/MQeAsUt/jZiTCvQztG+LNjG2accsgwcK5ybBQW5bH/7k3LLzrBUVTyNHwWS MaIxb/9EGdmaOu6IJdBktrVm90OrnkbAp6QFt7IVl0khNJZGoqEw87NVaoPPzNie+Z IG9IW94XbzqrA== Message-ID: <383e1567-0966-434e-a818-f70bff1d5220@kernel.org> Date: Mon, 9 Mar 2026 15:26:59 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 2/2] mm/memory hotplug/unplug: Optimize zone->contiguous update when changes pfn range To: "Li, Tianyou" , Mike Rapoport Cc: Oscar Salvador , Wei Yang , Michal Hocko , linux-mm@kvack.org, Yong Hu , Nanhai Zou , Yuan Liu , Tim Chen , Qiuxu Zhuo , Yu C Chen , Pan Deng , Chen Zhang , linux-kernel@vger.kernel.org References: <20260130163756.2674225-1-tianyou.li@intel.com> <20260130163756.2674225-3-tianyou.li@intel.com> <3cb317fa-abe0-4946-9f00-da00bade2def@kernel.org> <6ea2dbce-c919-49d6-b2cb-255a565a94e0@kernel.org> <2cb55d76-4da7-4ebe-b23b-0abbc4d963f3@kernel.org> <24ef67e7-6f0f-4544-a50c-90c4de368c40@intel.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: E0CC38001E X-Stat-Signature: yeac4895886b1dddup7k87kywk1d7ap4 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1773066427-577199 X-HE-Meta: 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 4E8wLmy8 vTd3awjXAb2VStc1pjsI0V74NzihxlKZnovtk5umaK3t5kbj63VDpTERACkz4gJKQdoK7+1XEubJ5a5FG8KlMUcmboV6ygkt2W23KHyl7IggaNYCBG0GC5Eq1R35mfTwP13ZyPwzytYTQz69w1/K8uFoifbdfcnBqNQVNEPoFzlmCqDrVulc2hbtvc7eBKU2jb9L/Ndne97lOo4+nrB6ILPqzTPJp9FQWyUpfIXpvBGcN4nkN6wM1cWYGdXIwStfuY6Z0iOmaFOhcfEX2DECra4o6OqFGYfzhsGuMVjSWR9Cu2L8WlzxRXetQFjmG1Uwph6qff3zKY8aErHk= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/9/26 01:42, Li, Tianyou wrote: > Hi David, Mike & Other maintainers, Hi! > > Just a quick update: Yuan and I created a new patch based on David and > Mike's code, updated the documentation as well, performed the > performance test, double check all the references etc. We observed a > slightly performance regression, not sure it was caused by the > environment configuration or we triggered some unexpected behavior. We > might need a bit more time to investigate. Will send out the patch soon > once we have confirmed data for the performance regression. Thanks. A performance regression would be rather unexpected, unless we somehow don't ever set zone->contiguous=true any more :) In which test / code path did you observe a regression? -- Cheers, David