linux-kernel - Re: [PATCH v3] mm: Allocate shrinker

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Date:   Fri, 31 Jan 2020 17:18:14 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>
Cc:     David Hildenbrand <david@...hat.com>, akpm@...ux-foundation.org,
        hannes@...xchg.org, shakeelb@...gle.com, vdavydov.dev@...il.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm: Allocate shrinker_map on appropriate NUMA node

On Fri 31-01-20 19:08:49, Kirill Tkhai wrote:
> mm: Allocate shrinker_map on appropriate NUMA node
> 
> From: Kirill Tkhai <ktkhai@...tuozzo.com>
> 
> Despite shrinker_map may be touched from any cpu
> (e.g., a bit there may be set by a task running
> everywhere); kswapd is always bound to specific
> node. So, we will allocate shrinker_map from
> related NUMA node to respect its NUMA locality.
> Also, this follows generic way we use for allocation
> memcg's per-node data.

I would just drop the last sentence.
 
> Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>

Acked-by: Michal Hocko <mhocko@...e.com>
> 
> v3: Remove node_state() patterns.
> v2: Use NUMA_NO_NODE instead of -1.
> ---
>  mm/memcontrol.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 6f6dc8712e39..c37382f5a43c 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -334,7 +334,7 @@ static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
>  		if (!old)
>  			return 0;
>  
> -		new = kvmalloc(sizeof(*new) + size, GFP_KERNEL);
> +		new = kvmalloc_node(sizeof(*new) + size, GFP_KERNEL, nid);
>  		if (!new)
>  			return -ENOMEM;
>  
> @@ -378,7 +378,7 @@ static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg)
>  	mutex_lock(&memcg_shrinker_map_mutex);
>  	size = memcg_shrinker_map_size;
>  	for_each_node(nid) {
> -		map = kvzalloc(sizeof(*map) + size, GFP_KERNEL);
> +		map = kvzalloc_node(sizeof(*map) + size, GFP_KERNEL, nid);
>  		if (!map) {
>  			memcg_free_shrinker_maps(memcg);
>  			ret = -ENOMEM;

-- 
Michal Hocko
SUSE Labs