Messages in this thread | | | Date | Wed, 8 Jun 2022 13:50:50 +0530 | Subject | Re: [PATCH v5 6/9] mm/demotion: Add support for removing node from demotion memory tiers | From | Aneesh Kumar K V <> |
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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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