linux-kernel - Re: [PATCH] mm/slub: remove meaningless node check in ___slab

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Message-ID: <YlKD3oz3HqQnucyc@hyeyoo>
Date:   Sun, 10 Apr 2022 16:14:38 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     JaeSang Yoo <js.yoo.5b@...il.com>
Cc:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Ohhoon Kwon <ohkwon1043@...il.com>,
        Wonhyuk Yang <vvghjk1234@...il.com>,
        Jiyoup Kim <lakroforce@...il.com>,
        Donghyeok Kim <dthex5d@...il.com>,
        JaeSang Yoo <jsyoo5b@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/slub: remove meaningless node check in ___slab_alloc()

On Sat, Apr 09, 2022 at 11:42:39PM +0900, JaeSang Yoo wrote:
> node_match() with node=NUMA_NO_NODE always returns 1.
> Duplicate check by goto statement is meaningless. Remove it.

Yeah, I think node = NUMA_NO_NODE here is to remove constraints
when later calling get_partial_node() or new_slab().

So no further check is required.

> 
> Signed-off-by: JaeSang Yoo <jsyoo5b@...il.com>
> ---
>  mm/slub.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 9fe000fd19ca..a65e282b8238 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2913,7 +2913,6 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
>  		 */
>  		if (!node_isset(node, slab_nodes)) {
>  			node = NUMA_NO_NODE;
> -			goto redo;
>  		} else {
>  			stat(s, ALLOC_NODE_MISMATCH);
>  			goto deactivate_slab;
> -- 
> 2.25.1

Looks good to me.

Reviewed-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Thanks!

> 
> 

-- 
Thanks,
Hyeonggon