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b=cl+T3eCizG7WiIcmVcH8Ez5A4rlX6y7uy2BLgB7lq20a7ulfYXUm64BsNtPmRr2N0 s7bjBo1ykwKVoa9BSdZDoo2u9ZLi9Fvaa07bk4xm6dPjwvMPSD0rIvkA1TIBMp27F5 +iIyy+4G+tcskX6T38MAAkG49ESye8v7pq/44dmtKP1rvHXDkTucSE+AqAwnXEbaJR oXkNbB92rXh4v+4m/kxJLN6zOrnEoNo7gSIey1ZgVh/GGbNq0LGvlY5brF3GLA+7Y2 8atinXm/CykmIiPli6VB37IBghZQBo2QIDfWdgSVCmHNlFV1YhodM0lQdLmnWVMRLL zOKG92U7/DmNA== Message-ID: <742ced29-d490-4b33-8fff-d6d503c0ee95@kernel.org> Date: Thu, 1 Oct 2026 12:34:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/7] sched/numa: scan read-only file mappings in tiering mode To: Gregory Price , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, joshua.hahnjy@gmail.com, rakie.kim@sk.com, ying.huang@linux.alibaba.com, matthew.brost@intel.com, byungchul@sk.com, apopple@nvidia.com, jannh@google.com, pfalcato@suse.de, hannes@cmpxchg.org, shy828301@gmail.com, osalvador@suse.de, raghavendra.kt@amd.com, stable@vger.kernel.org References: <20260930112206.205083-1-gourry@gourry.net> <20260930112206.205083-4-gourry@gourry.net> 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-Stat-Signature: zrdu7njuzpfxyyo8icqt16xtb1tfkj8b X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 35CFCC000A X-HE-Tag: 1790850892-697344 X-HE-Meta: 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 VPstoU/I eOgxpACZZhud7/ZF/jHVYsbOxHDYNuUnhNcl3tGllEBr385C2+TDfqYDEjxI58EWIPGJUnYy2NFMckzoeqLNVu9Z34MgCxGUsaTcaB8IqatHGhpwAX9oqIPULWoDGOEBoFYfJqEztTAsSAy2W2/gkM/txiPZSs6ybJ38lCAWoSsUGWoWnPgWUyWl2yxtG8dMR+CBveULKwnYRLLoBIVQFa5xWtJjSoEn2eUlpp1nlpQN/RAaq06bh18owsGFupPOC6zOSoEFWAjR4pM97C+FRe1C6vKlf6nt1EHCXnPpLdfFUt46aZ+uM1IA2rD23kXuV1vNufPJVlFZEMDxSLbRx3VqBFK/0d9EBz7u54K2Gkk24Fse7JetY4n4QmWCgEa8w0oZl1oMNr8jWaEIJPsV+uSjMrlt5VxXaOKXR Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/30/26 13:22, Gregory Price wrote: > From: "Gregory Price (Meta)" > > Commit 4591ce4f2d22 ("sched/numa: Do not trap hinting faults for > shared libraries") excludes file-backed read-only VMAs from NUMA > hint faulting to prevent east-west placement bouncing. > > This filter hides hot file folios on slow memory from promotion. > > Scan those VMAs when tiering is enabled, but make their scans promotion > only to retain the existing restriction. Keep the historical VMA > predicate unchanged for backport-ability. > > Decide the walk type for each VMA from the balancing-mode snapshot > taken in task_numa_work(). A VMA gets a placement scan only when normal > balancing is enabled and it is not a read-only file mapping. Otherwise > the walk is promotion-only, and without tiering the VMA is skipped as > before. > > On a host with 768 GB of DRAM and 256 GB of CXL memory running two > database services using ~430GB each, 169 MB of their shared 185 MB > main binary accumulated on CXL and was permanently stuck there. > > With the change, the binary tier residency tracks its runtime hotness. > > Fixes: c574bbe91703 ("NUMA balancing: optimize page placement for memory tiering system") > Cc: stable@vger.kernel.org > Assisted-by: LLM > Signed-off-by: Gregory Price (Meta) > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David