Re: [PATCH v5 2/9] mm/demotion: Expose per node memory tier to sysfs

[Tim Chen]

On Fri, 2022-06-03 at 19:12 +0530, Aneesh Kumar K.V wrote:
> 
>  
> +static struct memory_tier *__node_get_memory_tier(int node)
> +{
> +	struct memory_tier *memtier;
> +
> +	list_for_each_entry(memtier, &memory_tiers, list) {

We could need to map node to mem_tier quite often, if we need
to account memory usage at tier level.  It will be more efficient
to have a pointer from node (pgdat) to memtier rather
than doing a search through the list.


> +		if (node_isset(node, memtier->nodelist))
> +			return memtier;
> +	}
> +	return NULL;
> +}
> +
> 

Tim