linux-kernel - Re: [PATCH v2 05/23] mm/slab_common: cleanup _

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Date:   Tue, 26 Apr 2022 18:02:18 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        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>,
        Roman Gushchin <roman.gushchin@...ux.dev>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/23] mm/slab_common: cleanup __kmalloc()

On 4/14/22 10:57, Hyeonggon Yoo wrote:
> Make __kmalloc() wrapper of __kmalloc_node().

Again/similarly, looks like this will make SLUB not miss trace for
kmalloc_large() anymore.

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

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

Nit below:

> ---
>  include/linux/slab.h | 13 ++++++++++---
>  mm/slab.c            | 34 ----------------------------------
>  mm/slob.c            |  6 ------
>  mm/slub.c            | 23 -----------------------
>  4 files changed, 10 insertions(+), 66 deletions(-)
> 
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index acdb4b7428f9..4c06d15f731c 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -419,7 +419,16 @@ static __always_inline unsigned int __kmalloc_index(size_t size,
>  #define kmalloc_index(s) __kmalloc_index(s, true)
>  #endif /* !CONFIG_SLOB */
>  
> -void *__kmalloc(size_t size, gfp_t flags) __assume_kmalloc_alignment __alloc_size(1);
> +extern void *__kmalloc_node(size_t size, gfp_t flags, int node)
> +			    __assume_kmalloc_alignment
> +			    __alloc_size(1);
> +

Again, no 'extern' please.

> +static __always_inline __alloc_size(1) __assume_kmalloc_alignment
> +void *__kmalloc(size_t size, gfp_t flags)
> +{
> +	return __kmalloc_node(size, flags, NUMA_NO_NODE);
> +}
> +
>  void *kmem_cache_alloc(struct kmem_cache *s, gfp_t flags) __assume_slab_alignment __malloc;
>  void *kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
>  			   gfp_t gfpflags) __assume_slab_alignment __malloc;