linux-kernel - Re: [PATCH 2/2] mm/cgroup: delay soft limit data allocation

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Date:   Wed, 22 Feb 2017 18:11:33 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm/cgroup: delay soft limit data allocation

On Wed 22-02-17 16:58:11, Laurent Dufour wrote:
[...]
>  static struct mem_cgroup_tree_per_node *
>  soft_limit_tree_node(int nid)
>  {
> @@ -465,6 +497,8 @@ static void mem_cgroup_update_tree(struct mem_cgroup *memcg, struct page *page)
>  	struct mem_cgroup_tree_per_node *mctz;
>  
>  	mctz = soft_limit_tree_from_page(page);
> +	if (!mctz)
> +		return;
>  	/*
>  	 * Necessary to update all ancestors when hierarchy is used.
>  	 * because their event counter is not touched.
> @@ -502,7 +536,8 @@ static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg)
>  	for_each_node(nid) {
>  		mz = mem_cgroup_nodeinfo(memcg, nid);
>  		mctz = soft_limit_tree_node(nid);
> -		mem_cgroup_remove_exceeded(mz, mctz);
> +		if (mctz)
> +			mem_cgroup_remove_exceeded(mz, mctz);
>  	}
>  }
>  

this belongs to the previous patch, right?
-- 
Michal Hocko
SUSE Labs