linux-kernel - Re: [RFC PATCH v1 07/15] mm/sl[au]b: kmalloc_node: pass large requests to page allocator

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Date:   Thu, 24 Mar 2022 18:36:55 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org
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>,
        Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 07/15] mm/sl[au]b: kmalloc_node: pass large
 requests to page allocator

On 3/8/22 12:41, Hyeonggon Yoo wrote:
> Now that kmalloc_large_node() is in common code, pass large requests
> to page allocator in kmalloc_node() using kmalloc_large_node().
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

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

> ---
>  include/linux/slab.h | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index 8840b2d55567..33d4260bce8b 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -551,23 +551,35 @@ static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
>  	return __kmalloc(size, flags);
>  }
>  
> +#ifndef CONFIG_SLOB
>  static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
>  {
> -#ifndef CONFIG_SLOB
> -	if (__builtin_constant_p(size) &&
> -		size <= KMALLOC_MAX_CACHE_SIZE) {
> -		unsigned int i = kmalloc_index(size);
> +	if (__builtin_constant_p(size)) {
> +		unsigned int index;
>  
> -		if (!i)
> +		if (size > KMALLOC_MAX_CACHE_SIZE)
> +			return kmalloc_large_node(size, flags, node);
> +
> +		index = kmalloc_index(size);
> +
> +		if (!index)
>  			return ZERO_SIZE_PTR;
>  
>  		return kmem_cache_alloc_node_trace(
>  				kmalloc_caches[kmalloc_type(flags)][i],
>  						flags, node, size);
>  	}
> -#endif
>  	return __kmalloc_node(size, flags, node);
>  }
> +#else
> +static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
> +{
> +	if (__builtin_constant_p(size) && size > KMALLOC_MAX_CACHE_SIZE)
> +		return kmalloc_large_node(size, flags, node);
> +
> +	return __kmalloc_node(size, flags, node);
> +}
> +#endif
>  
>  /**
>   * kmalloc_array - allocate memory for an array.