linux-kernel - Re: [v8 2/4] mm, oom: cgroup-aware OOM killer

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Message-ID: <alpine.DEB.2.10.1709131346200.146292@chino.kir.corp.google.com>
Date:   Wed, 13 Sep 2017 13:46:51 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Roman Gushchin <guro@...com>
cc:     linux-mm@...ck.org, Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, kernel-team@...com,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v8 2/4] mm, oom: cgroup-aware OOM killer

On Mon, 11 Sep 2017, Roman Gushchin wrote:

> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 15af3da5af02..da2b12ea4667 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2661,6 +2661,231 @@ static inline bool memcg_has_children(struct mem_cgroup *memcg)
>  	return ret;
>  }
>  
> +static long memcg_oom_badness(struct mem_cgroup *memcg,
> +			      const nodemask_t *nodemask,
> +			      unsigned long totalpages)
> +{
> +	long points = 0;
> +	int nid;
> +	pg_data_t *pgdat;
> +
> +	/*
> +	 * We don't have necessary stats for the root memcg,
> +	 * so we define it's oom_score as the maximum oom_score
> +	 * of the belonging tasks.
> +	 */
> +	if (memcg == root_mem_cgroup) {
> +		struct css_task_iter it;
> +		struct task_struct *task;
> +		long score, max_score = 0;
> +
> +		css_task_iter_start(&memcg->css, 0, &it);
> +		while ((task = css_task_iter_next(&it))) {
> +			score = oom_badness(task, memcg, nodemask,
> +					    totalpages);
> +			if (max_score > score)

score > max_score

> +				max_score = score;
> +		}
> +		css_task_iter_end(&it);
> +
> +		return max_score;
> +	}
> +
> +	for_each_node_state(nid, N_MEMORY) {
> +		if (nodemask && !node_isset(nid, *nodemask))
> +			continue;
> +
> +		points += mem_cgroup_node_nr_lru_pages(memcg, nid,
> +				LRU_ALL_ANON | BIT(LRU_UNEVICTABLE));
> +
> +		pgdat = NODE_DATA(nid);
> +		points += lruvec_page_state(mem_cgroup_lruvec(pgdat, memcg),
> +					    NR_SLAB_UNRECLAIMABLE);
> +	}
> +
> +	points += memcg_page_state(memcg, MEMCG_KERNEL_STACK_KB) /
> +		(PAGE_SIZE / 1024);
> +	points += memcg_page_state(memcg, MEMCG_SOCK);
> +	points += memcg_page_state(memcg, MEMCG_SWAP);
> +
> +	return points;
> +}