1What:		/sys/kernel/mm/numa/
2Date:		June 2021
3Contact:	Linux memory management mailing list <linux-mm@kvack.org>
4Description:	Interface for NUMA
5
6What:		/sys/kernel/mm/numa/demotion_enabled
7Date:		June 2021
8Contact:	Linux memory management mailing list <linux-mm@kvack.org>
9Description:	Enable/disable demoting pages during reclaim
10
11		Page migration during reclaim is intended for systems
12		with tiered memory configurations.  These systems have
13		multiple types of memory with varied performance
14		characteristics instead of plain NUMA systems where
15		the same kind of memory is found at varied distances.
16		Allowing page migration during reclaim enables these
17		systems to migrate pages from fast tiers to slow tiers
18		when the fast tier is under pressure.  This migration
19		is performed before swap.  It may move data to a NUMA
20		node that does not fall into the cpuset of the
21		allocating process which might be construed to violate
22		the guarantees of cpusets.  This should not be enabled
23		on systems which need strict cpuset location
24		guarantees.
25