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    SubjectRe: [PATCH v5 6/9] mm/demotion: Add support for removing node from demotion memory tiers
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    On 6/8/22 12:29 PM, Ying Huang wrote:
    > On Fri, 2022-06-03 at 19:12 +0530, Aneesh Kumar K.V wrote:
    >> This patch adds the special string "none" as a supported memtier value
    >> that we can use to remove a specific node from being using as demotion target.
    >>
    >> For ex:
    >> :/sys/devices/system/node/node1# cat memtier
    >> 1
    >> :/sys/devices/system/node/node1# cat ../../memtier/memtier1/nodelist
    >> 1-3
    >> :/sys/devices/system/node/node1# echo none > memtier
    >> :/sys/devices/system/node/node1#
    >> :/sys/devices/system/node/node1# cat memtier
    >> :/sys/devices/system/node/node1# cat ../../memtier/memtier1/nodelist
    >> 2-3
    >> :/sys/devices/system/node/node1#
    >
    > Do you have a practical use case for this? What kind of memory node
    > needs to be removed from memory tiers demotion/promotion?
    >

    This came up in our internal discussion. It was mentioned that there is
    a need to skip some slow memory nodes from participating in demotion.

    -aneesh

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