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- What: /sys/kernel/mm/numa/
- Date: June 2021
- Contact: Linux memory management mailing list <[email protected]>
- Description: Interface for NUMA
- What: /sys/kernel/mm/numa/demotion_enabled
- Date: June 2021
- Contact: Linux memory management mailing list <[email protected]>
- Description: Enable/disable demoting pages during reclaim
- Page migration during reclaim is intended for systems
- with tiered memory configurations. These systems have
- multiple types of memory with varied performance
- characteristics instead of plain NUMA systems where
- the same kind of memory is found at varied distances.
- Allowing page migration during reclaim enables these
- systems to migrate pages from fast tiers to slow tiers
- when the fast tier is under pressure. This migration
- is performed before swap. It may move data to a NUMA
- node that does not fall into the cpuset of the
- allocating process which might be construed to violate
- the guarantees of cpusets. This should not be enabled
- on systems which need strict cpuset location
- guarantees.
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