Re: RFC: Memory Tiering Kernel Interfaces (v3)

[Aneesh Kumar K V]

On 5/27/22 2:52 AM, Wei Xu wrote:

>    The order of memory tiers is determined by their rank values, not by
>    their memtier device names.
>
>    - /sys/devices/system/memtier/possible
>
>      Format: ordered list of "memtier(rank)"
>      Example: 0(64), 1(128), 2(192)
>
>      Read-only.  When read, list all available memory tiers and their
>      associated ranks, ordered by the rank values (from the highest
>       tier to the lowest tier).

Did we discuss the need for this? I haven't done this in the patch 
series I sent across. We do have 
/sys/devices/system/memtier/default_rank which should allow user to 
identify the default rank to which memory would get added via hotplug if 
the NUMA node is not part of any memory tier.


-aneesh