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 zj96ODMc 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/8/26 4:09 AM, David Hildenbrand (Arm) wrote: >>> It was also found that adding '--mremap-numa' changes the behavior >>> substantially: >> "assign memory mapped pages to randomly selected NUMA nodes. This is >> disabled for systems that do not support NUMA." >> >> so this is just sharding your lock contention across your NUMA nodes (you >> have an lruvec per node). >> >>> stress-ng --mremap 8192 --mremap-bytes 4K --timeout 30 --mremap-numa >>> --metrics-brief >>> >>> mremap 2570798 29.39 8.06 106.23 87466.50 22494.74 >>> >>> So it's possible that either actual swapping, or the mbind(..., >>> MPOL_MF_MOVE) path used by '--mremap-numa', removes most of the excessive >>> system time. >>> >>> Does this look like a known MM scalability issue around short-lived >>> MAP_POPULATE / munmap churn? >> Yes. Is this an actual issue on some workload? > Same thought, it's unclear to me why we should care here. In particular, > when talking about excessive use of zero-filled pages. > Currently this is only showing up with that particular stress test. We will try John's patch and provide feedback. Thanks for all the feedback, everyone!