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b=b6VwgqfILcG8FeFaIWu+DpKiAAl03QgVszTQCrSWT8MAKoNwAbNTlkxRN3uWu50yP NJZ50HtAspJQ2DQlmn8EcJUwz7pLZ2M9ff26SidVSUGVu/s+V1ZwZF8BIh+f8YCjzw F54QgJLm49aXZwLS2fQZ3AegJIsn4oU9jZnbSqdo= Date: Mon, 3 Aug 2026 14:40:14 -0700 From: Andrew Morton To: "Li Zhe" Cc: , , , , , , , , , , , , , , , Subject: Re: [PATCH v9 0/8] mm: optimize zone-device memmap initialization Message-Id: <20260803144014.e2d4ebb83e9471b695f6290d@linux-foundation.org> In-Reply-To: <20260803070929.86075-1-lizhe.67@bytedance.com> References: <20260803070929.86075-1-lizhe.67@bytedance.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspam-User: X-Stat-Signature: ht3t76b6eu17xe763qgdiiehzr39arwx X-Rspamd-Queue-Id: 1E010C0002 X-HE-Tag: 1785793215-8230 X-HE-Meta: U2FsdGVkX1/TFED2IF+BjqJOkonTBWHiN1bEdgjVq3JNLJWoA0sBq69I8+YjZZq/qVl7CVsk+kPe0dd+A0EQW0OwgbxKQEir6+jAAiUH2ufbpuppwH2aJsHr0I4NEVcTZJBbaKszhkwt2YYrSekP5etkBuoHyoROgzdatnsijHthtQah+Cx1UPD1I4/8M0mZsPdYsa43Slck+vlB1KFVbb0Pw6lv5rOLygpXas1IRKFZkQ4Hbw0FXeE+vz8VYYdo6mXmnppM4NSQ/h+yahYHtmrydFRTYlZnMGBHwL4X6n8N+JK7+tO40GERfqM5WSKtU8h2a1PxaBZvlba6lLzQiRPlmo7IvcKzyXu8/CjPIv0gRCUgBXr14XX8jsIeu1r2/efCoGDGWLB/zq6sGekClO09K8a4rdJgRADA3Z6HO1nxr79hXF8RPJo2qIYB1EMCQ3H/UrfrtvCgeSj5wvYZiYUx0I1axWUlzcVV1KVL/3tozRdeLPurEIMJJ/zRbt2hgJIfYYU7XMhchmUnvPK9MgXS29c+PpcWYYkW/ugkBEQ0qE0vheXHPFT7T9PUJEOUxIvtjtkDs54OmkMw0UyGnux1qnvX+SNCs6PoRyDZvCd1pNxEF9hld0j2m0vrzdghKJCTztIUMpy7sAOutWnuko+6qp+S6HUaEkkjJibfUCdhYhLNjbtdv6/cONENxXLOa2LZFQPQINKMAfQ2WFDcJkgixx9EdWharWdr0jJf8t9Au6PcAq0X9cfveDUf7I2AjYdJ7dJ8+mv8BHL2qjGnENCclBcBwtKbdfMRiS13Pnm5dU7JCNzwegQ1I5S5siQJ3FKMIrtDYKTKC+xdPDIEnI5jmaD2pY/xqzGZFZm8bVZB6Xe+2Cn4DAjYl0XmW8qJsJWpjKYyNB8DqPpct1vjMOyqSP18jC/1iwVInMTum9GoiyZJMUnnk22N9HfmPHYpaRhpPbIicOtWFLRXQQH RWSq5rqz LNa4d/kfQxqq+3+5XB9mgpMvmdVvFxXUz7x11Pj+1Rv8rNZE4pw1N6UXoFdVTa83LLD9HlFcN0wClan4yodo4LQoQaNdLAwyuPVnXzbxg4XXTcOEMwnAPpQi3+l6bUp2tUd6kcJBKNDDpQJP5k2BM+WqrIM4mfZI3xOVy+SD77kvSVG6CD0Ygh+LIdv36LUWquqAfp949dICqZT29nkFIHIRRYbX7VcH1YC9g5QrYcl6AudJkFGv+JJEbhzgJyaChy0V0NGvIG5A9ZmyT+reHU9dm7XHN9en+vsF+D2jUQdvwXMJHZXVqI3pvJv2tjDMjtZtlqj66Zk7/pzPqGsr+Uan3Lg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 3 Aug 2026 15:09:21 +0800 "Li Zhe" wrote: > Test procedure: > Rebind the nd_pmem and dax_pmem drivers 30 times and collect the memmap > initialization time from the pr_debug() output of > memmap_init_zone_device(). > > Base(v7.2-rc1): > Average of nd_pmem rebinds: 244.28 ms > Average of dax_pmem rebinds: 273.31 ms > > With this series applied: > Average of nd_pmem rebinds: 96.79 ms > Average of dax_pmem rebinds: 119.04 ms > > This reduces the average memmap initialization time measured during > rebind by about 60.4% for nd_pmem and 56.4% for dax_pmem. Well that's nice. Review is partial and it's late in the cycle so I'd prefer to schedule this for the next -rc cycle. AI review might have found a couple of things, please check? https://sashiko.dev/#/patchset/20260803070929.86075-1-lizhe.67@bytedance.com