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