linux-kernel - Re: [PATCH 2/7] mm: memcontrol: kill mem_cgroup

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Message-ID: <YBv2sYiMmPhYmW3h@dhcp22.suse.cz>
Date:   Thu, 4 Feb 2021 14:29:21 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Roman Gushchin <guro@...com>,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 2/7] mm: memcontrol: kill mem_cgroup_nodeinfo()

On Tue 02-02-21 13:47:41, Johannes Weiner wrote:
> No need to encapsulate a simple struct member access.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  include/linux/memcontrol.h |  8 +-------
>  mm/memcontrol.c            | 21 +++++++++++----------
>  2 files changed, 12 insertions(+), 17 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 7a38a1517a05..c7f387a6233e 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -602,12 +602,6 @@ void mem_cgroup_uncharge_list(struct list_head *page_list);
>  
>  void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
>  
> -static struct mem_cgroup_per_node *
> -mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
> -{
> -	return memcg->nodeinfo[nid];
> -}
> -
>  /**
>   * mem_cgroup_lruvec - get the lru list vector for a memcg & node
>   * @memcg: memcg of the wanted lruvec
> @@ -631,7 +625,7 @@ static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
>  	if (!memcg)
>  		memcg = root_mem_cgroup;
>  
> -	mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
> +	mz = memcg->nodeinfo[pgdat->node_id];
>  	lruvec = &mz->lruvec;
>  out:
>  	/*
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 8120d565dd79..7e05a4ebf80f 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -414,13 +414,14 @@ static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
>  					 int size, int old_size)
>  {
>  	struct memcg_shrinker_map *new, *old;
> +	struct mem_cgroup_per_node *pn;
>  	int nid;
>  
>  	lockdep_assert_held(&memcg_shrinker_map_mutex);
>  
>  	for_each_node(nid) {
> -		old = rcu_dereference_protected(
> -			mem_cgroup_nodeinfo(memcg, nid)->shrinker_map, true);
> +		pn = memcg->nodeinfo[nid];
> +		old = rcu_dereference_protected(pn->shrinker_map, true);
>  		/* Not yet online memcg */
>  		if (!old)
>  			return 0;
> @@ -433,7 +434,7 @@ static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
>  		memset(new->map, (int)0xff, old_size);
>  		memset((void *)new->map + old_size, 0, size - old_size);
>  
> -		rcu_assign_pointer(memcg->nodeinfo[nid]->shrinker_map, new);
> +		rcu_assign_pointer(pn->shrinker_map, new);
>  		call_rcu(&old->rcu, memcg_free_shrinker_map_rcu);
>  	}
>  
> @@ -450,7 +451,7 @@ static void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
>  		return;
>  
>  	for_each_node(nid) {
> -		pn = mem_cgroup_nodeinfo(memcg, nid);
> +		pn = memcg->nodeinfo[nid];
>  		map = rcu_dereference_protected(pn->shrinker_map, true);
>  		kvfree(map);
>  		rcu_assign_pointer(pn->shrinker_map, NULL);
> @@ -713,7 +714,7 @@ static void mem_cgroup_remove_from_trees(struct mem_cgroup *memcg)
>  	int nid;
>  
>  	for_each_node(nid) {
> -		mz = mem_cgroup_nodeinfo(memcg, nid);
> +		mz = memcg->nodeinfo[nid];
>  		mctz = soft_limit_tree_node(nid);
>  		if (mctz)
>  			mem_cgroup_remove_exceeded(mz, mctz);
> @@ -796,7 +797,7 @@ parent_nodeinfo(struct mem_cgroup_per_node *pn, int nid)
>  	parent = parent_mem_cgroup(pn->memcg);
>  	if (!parent)
>  		return NULL;
> -	return mem_cgroup_nodeinfo(parent, nid);
> +	return parent->nodeinfo[nid];
>  }
>  
>  void __mod_memcg_lruvec_state(struct lruvec *lruvec, enum node_stat_item idx,
> @@ -1163,7 +1164,7 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
>  	if (reclaim) {
>  		struct mem_cgroup_per_node *mz;
>  
> -		mz = mem_cgroup_nodeinfo(root, reclaim->pgdat->node_id);
> +		mz = root->nodeinfo[reclaim->pgdat->node_id];
>  		iter = &mz->iter;
>  
>  		if (prev && reclaim->generation != iter->generation)
> @@ -1265,7 +1266,7 @@ static void __invalidate_reclaim_iterators(struct mem_cgroup *from,
>  	int nid;
>  
>  	for_each_node(nid) {
> -		mz = mem_cgroup_nodeinfo(from, nid);
> +		mz = from->nodeinfo[nid];
>  		iter = &mz->iter;
>  		cmpxchg(&iter->position, dead_memcg, NULL);
>  	}
> @@ -2438,7 +2439,7 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu)
>  				struct mem_cgroup_per_node *pn;
>  				long x;
>  
> -				pn = mem_cgroup_nodeinfo(memcg, nid);
> +				pn = memcg->nodeinfo[nid];
>  				lstatc = per_cpu_ptr(pn->lruvec_stat_cpu, cpu);
>  
>  				x = lstatc->count[i];
> @@ -4145,7 +4146,7 @@ static int memcg_stat_show(struct seq_file *m, void *v)
>  		unsigned long file_cost = 0;
>  
>  		for_each_online_pgdat(pgdat) {
> -			mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
> +			mz = memcg->nodeinfo[pgdat->node_id];
>  
>  			anon_cost += mz->lruvec.anon_cost;
>  			file_cost += mz->lruvec.file_cost;
> -- 
> 2.30.0
> 

-- 
Michal Hocko
SUSE Labs