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

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Message-ID: <fa6b575dfea7c2131ecfec0f5578d72ca4acfd95.camel@linux.intel.com>
Date:   Tue, 07 Jun 2022 13:15:59 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     Wei Xu <weixugc@...gle.com>, Huang Ying <ying.huang@...el.com>,
        Greg Thelen <gthelen@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim C Chen <tim.c.chen@...el.com>,
        Brice Goglin <brice.goglin@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hesham Almatary <hesham.almatary@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Alistair Popple <apopple@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Feng Tang <feng.tang@...el.com>,
        Jagdish Gediya <jvgediya@...ux.ibm.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v5 2/9] mm/demotion: Expose per node memory tier to sysfs

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