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[2003:d8:2f22:2e00:6e71:238a:de9f:e396]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-447f23c080asm114866175e9.22.2025.05.22.09.11.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 May 2025 09:11:15 -0700 (PDT) Message-ID: <62cef618-123c-4ffa-b45a-c38b65d2a5a3@redhat.com> Date: Thu, 22 May 2025 18:11:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v0 2/2] mm: sched: Batch-migrate misplaced pages To: Bharata B Rao , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Jonathan.Cameron@huawei.com, dave.hansen@intel.com, gourry@gourry.net, hannes@cmpxchg.org, mgorman@techsingularity.net, mingo@redhat.com, peterz@infradead.org, raghavendra.kt@amd.com, riel@surriel.com, rientjes@google.com, sj@kernel.org, weixugc@google.com, willy@infradead.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, dave@stgolabs.net, nifan.cxl@gmail.com, joshua.hahnjy@gmail.com, xuezhengchu@huawei.com, yiannis@zptcorp.com, akpm@linux-foundation.org References: <20250521080238.209678-1-bharata@amd.com> <20250521080238.209678-3-bharata@amd.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9667F120011 X-Stat-Signature: nmtpkzfh8nxujz4oegbf6pto4xqdp5zg X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1747930279-105201 X-HE-Meta: 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 qM5xdWxO W2F+sKeBCL9q4aLv3iCZEm1OuKf6f802TaK3yD9oZSY1fI9l0fCy2iLMC3uK/WAuLzRSCh8P45mESq9mPcIWcnG7rfY013RT0Np9w6lFSpw0FHQOKFc8v4qJWvcrr/W+3kHQaxeVpPScHQVO+NAcpqGalQLcCg4gYZYBJpx94VRhySyTc5Pnxr7dYmby8DXVwpWGr4HI/yK4Sjzr7MN07IttkW83ZLaBxxTkkIVC0YC/BXjDbThnb2d+Cc6V0GuInU9meAdM869fiEMV5Jt/4iLJaBy3ImsLI8l7wewMSd+xloyhhbOGwornvAuYa6oLfjAB/cUd3N/9hyMmQTY9Yv/GDm9zBb9wqUebxb8yx2fE0U7HTZ9IxsokjeGWNwpS7XFUmcfmJ2SrQkOkf9IP7W+dnJFLVMc2lX7ogcXEDCtYClFTXUDmfX+3niWI6o3cqHHyGzceEQHm7UBYujxLAWrEqYSqXDNpw2elD 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 21.05.25 10:02, Bharata B Rao wrote: > Currently the folios identified as misplaced by the NUMA > balancing sub-system are migrated one by one from the NUMA > hint fault handler as and when they are identified as > misplaced. > > Instead of such singe folio migrations, batch them and > migrate them at once. > > Identified misplaced folios are isolated and stored in > a per-task list. A new task_work is queued from task tick > handler to migrate them in batches. Migration is done > periodically or if pending number of isolated foios exceeds > a threshold. That means that these pages are effectively unmovable for other purposes (CMA, compaction, long-term pinning, whatever) until that list was drained. Bad. -- Cheers, David / dhildenb