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1What: /sys/kernel/mm/numa/2Date: June 20213Contact: Linux memory management mailing list <linux-mm@kvack.org>4Description: Interface for NUMA5 6What: /sys/kernel/mm/numa/demotion_enabled7Date: June 20218Contact: Linux memory management mailing list <linux-mm@kvack.org>9Description: Enable/disable demoting pages during reclaim10 11 Page migration during reclaim is intended for systems12 with tiered memory configurations. These systems have13 multiple types of memory with varied performance14 characteristics instead of plain NUMA systems where15 the same kind of memory is found at varied distances.16 Allowing page migration during reclaim enables these17 systems to migrate pages from fast tiers to slow tiers18 when the fast tier is under pressure. This migration19 is performed before swap. It may move data to a NUMA20 node that does not fall into the cpuset of the21 allocating process which might be construed to violate22 the guarantees of cpusets. This should not be enabled23 on systems which need strict cpuset location24 guarantees.25