linux-kernel - Re: [PATCH v2 12/46] mm/memcg: Use the node id in mem_cgroup_update

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Date:   Wed, 23 Jun 2021 10:12:40 +0200
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 12/46] mm/memcg: Use the node id in
 mem_cgroup_update_tree()

On Tue, Jun 22, 2021 at 01:15:17PM +0100, Matthew Wilcox (Oracle) wrote:
>  static struct mem_cgroup_per_node *
> -mem_cgroup_page_nodeinfo(struct mem_cgroup *memcg, struct page *page)
> +mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
>  {
> -	int nid = page_to_nid(page);
> -
>  	return memcg->nodeinfo[nid];
>  }

I'd just kill this function entirely and open code it into the only
caller

> -	mctz = soft_limit_tree_from_page(page);
> +	mctz = soft_limit_tree_node(nid);

And while were at it, soft_limit_tree_node seems like a completely
pointless helper that does nothing but obsfucating the code.  While
you touch this area it might be worth to spin another patch to just
remove it as well.