Re: RFC: Memory Tiering Kernel Interfaces (v3)

Aneesh Kumar K V
2022-05-27T13:41:56Z

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