linux-kernel - Re: [PATCH v2 2/2] mm: slub: Delete useless parameter of alloc_slab

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Date:   Thu, 10 Mar 2022 14:45:24 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     sxwjean@...com
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org, vbabka@...e.cz,
        longman@...hat.com, guro@...com, willy@...radead.org,
        roman.gushchin@...ux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Xiongwei Song <sxwjean@...il.com>
Subject: Re: [PATCH v2 2/2] mm: slub: Delete useless parameter of
 alloc_slab_page()

> From: Xiongwei Song <sxwjean@...il.com>
>
> The parameter @s is useless for alloc_slab_page(). It was added in 2014
> by commit 5dfb41750992 ("sl[au]b: charge slabs to kmemcg explicitly"). The
> need for it was removed in 2020 by commit 1f3147b49d75 ("mm: slub: call
> account_slab_page() after slab page initialization"). Let's delete it.
>
> [willy@...radead.org: Added detailed history of @s]
> Signed-off-by: Xiongwei Song <sxwjean@...il.com>
> Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Acked-by: David Rientjes <rientjes@...gle.com>
> Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>
> ---
> mm/slub.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index 261474092e43..5d273ee04c43 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1788,8 +1788,8 @@ static void *setup_object(struct kmem_cache *s, struct slab *slab,
>  /*
>  * Slab allocation and freeing
>  */
> -static inline struct slab *alloc_slab_page(struct kmem_cache *s,
> -		gfp_t flags, int node, struct kmem_cache_order_objects oo)
> +static inline struct slab *alloc_slab_page(gfp_t flags, int node,
> +		struct kmem_cache_order_objects oo)
>  {
>  	struct folio *folio;
> 	struct slab *slab;
> @@ -1941,7 +1941,7 @@ static struct slab *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
> 	if ((alloc_gfp & __GFP_DIRECT_RECLAIM) && oo_order(oo) > oo_order(s->min))
> 		alloc_gfp = (alloc_gfp | __GFP_NOMEMALLOC) & ~(__GFP_RECLAIM|__GFP_NOFAIL);
> 
>-	slab = alloc_slab_page(s, alloc_gfp, node, oo);
>+	slab = alloc_slab_page(alloc_gfp, node, oo);
> 	if (unlikely(!slab)) {
> 		oo = s->min;
> 		alloc_gfp = flags;
>@@ -1949,7 +1949,7 @@ static struct slab *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
> 		 * Allocation may have failed due to fragmentation.
> 		 * Try a lower order alloc if possible
> 		 */
>-		slab = alloc_slab_page(s, alloc_gfp, node, oo);
>+		slab = alloc_slab_page(alloc_gfp, node, oo);
> 		if (unlikely(!slab))
> 			goto out;
> 		stat(s, ORDER_FALLBACK);

Looks good, nice changelog!

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