linux-kernel - Re: [PATCH] mm/mempool: Use kmalloc_array_node to replace kmalloc

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Message-ID: <Z6WsZsczBNOrmN0N@MacBook-Air-5.local>
Date: Fri, 7 Feb 2025 15:47:02 +0900
From: "Harry (Hyeonggon) Yoo" <42.hyeyoo@...il.com>
To: Liu Ye <liuye@...inos.cn>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/mempool: Use kmalloc_array_node to replace
 kmalloc_array

On Fri, Feb 07, 2025 at 01:52:13PM +0800, Liu Ye wrote:
> The kmalloc_array call could be replaced with kmalloc_array_node
> to allocate memory on a specific NUMA node.

Why is it useful to replace kmalloc_array() with kmalloc_array_node()
in the code?

> Signed-off-by: Liu Ye <liuye@...inos.cn>
> ---
>  mm/mempool.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/mempool.c b/mm/mempool.c
> index 3223337135d0..51eabcc87177 100644
> --- a/mm/mempool.c
> +++ b/mm/mempool.c
> @@ -328,8 +328,8 @@ int mempool_resize(mempool_t *pool, int new_min_nr)
>  	spin_unlock_irqrestore(&pool->lock, flags);
>  
>  	/* Grow the pool */
> -	new_elements = kmalloc_array(new_min_nr, sizeof(*new_elements),
> -				     GFP_KERNEL);
> +	new_elements = kmalloc_array_node(new_min_nr, sizeof(*new_elements),
> +				     GFP_KERNEL, NUMA_NO_NODE);

What do you mean by 'allocate memory on a specific NUMA node'
when you pass NUMA_NO_NODE?
It's essentially the same as what kmalloc_array() does.

-- 
Harry