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 N9ZoVOFH 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 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 22-May-25 9:41 PM, David Hildenbrand wrote: > 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. During the last week's MM alignment call on this subject, it was decided not to isolate and batch from fault context and migrate from task_work context like this. However since the amount of time the folios stay in isolated state was bounded both by time(1s in my patchset) and the number of folios isolated, I thought it should be okay, but I may be wrong. Regards, Bharata.