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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