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    SubjectRe: RFC: Memory Tiering Kernel Interfaces (v2)
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    On Thu, 2022-05-12 at 01:15 -0700, Wei Xu wrote:
    >
    > I am OK with moving back the memory tier nodelist into node/. When
    > there are more memory tier attributes needed, we can then create the
    > memory tier subtree and replace the tier nodelist in node/ with
    > symlinks.
    >
    > So the revised sysfs interfaces are:
    >
    > * /sys/devices/system/node/memory_tierN (read-only)
    >
    > where N = 0, 1, 2
    >
    > Format: node_list
    >
    > * /sys/devices/system/node/nodeN/memory_tier (read/write)
    >
    > where N = 0, 1, ...
    >
    > Format: int or empty

    This looks good to me. Just wonder if having just 1 tier
    lower than DRAM is sufficient. We could have wide performance
    range for such secondary memories and is one tier sufficient for them?

    Tim

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