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    Subject[PATCH v8 12/12] mm/demotion: Add sysfs ABI documentation
    Date
    Add sysfs ABI documentation.

    Signed-off-by: Wei Xu <weixugc@google.com>
    Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
    ---
    .../ABI/testing/sysfs-kernel-mm-memory-tiers | 61 +++++++++++++++++++
    1 file changed, 61 insertions(+)
    create mode 100644 Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers

    diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers b/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers
    new file mode 100644
    index 000000000000..843fb59d2f3d
    --- /dev/null
    +++ b/Documentation/ABI/testing/sysfs-kernel-mm-memory-tiers
    @@ -0,0 +1,61 @@
    +What: /sys/devices/system/memtier/
    +Date: June 2022
    +Contact: Linux memory management mailing list <linux-mm@kvack.org>
    +Description: Interface for tiered memory
    +
    + This is the directory containing the information about memory tiers.
    +
    + Each memory tier has its own subdirectory.
    +
    + The order of memory tiers is determined by their tier ID value.
    + A higher tier ID value means a higher tier. memtier300 is higher
    + memory tier compared to memtier 100.
    +
    +What: /sys/devices/system/memtier/default_tier
    +Date: June 2022
    +Contact: Linux memory management mailing list <linux-mm@kvack.org>
    +Description: Default memory tier
    +
    + The default memory tier to which memory would get added via hotplug
    + if the NUMA node is not part of any memory tier
    +
    +What: /sys/devices/system/memtier/max_tier
    +Date: June 2022
    +Contact: Linux memory management mailing list <linux-mm@kvack.org>
    +Description: Maximum memory tier ID supported
    +
    + The max memory tier device ID we can create. Users can create memory
    + tiers in range [0 - max_tier]
    +
    +What: /sys/devices/system/memtier/memtierN/
    +Date: June 2022
    +Contact: Linux memory management mailing list <linux-mm@kvack.org>
    +Description: Directory with details of a specific memory tier
    +
    + This is the directory containing the information about a particular
    + memory tier, memtierN, where N is the memtier device ID (e.g. 0, 1).
    +
    + The memtier device ID number itself is just an identifier and has no
    + special meaning. Its value relative to other memtiers decides the level
    + of this memtier in the tier hierarchy.
    +
    +
    +What: /sys/devices/system/memtier/memtierN/nodelist
    +Date: June 2022
    +Contact: Linux memory management mailing list <linux-mm@kvack.org>
    +Description: Memory tier nodelist
    +
    +
    + When read, list the memory nodes in the specified tier.
    +
    +What: /sys/devices/system/node/nodeN/memtier
    +Date: June 2022
    +Contact: Linux memory management mailing list <linux-mm@kvack.org>
    +Description: Memory tier details for node N
    +
    + When read, list the device ID of the memory tier that the node belongs
    + to. Its value is empty for a CPU-only NUMA node.
    +
    + When written, the kernel moves the node into the specified memory
    + tier if the move is allowed. The tier assignments of all other
    + nodes are not affected.
    --
    2.36.1
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