linux-kernel - Re: [RFC PATCH v1 08/15] mm/sl[auo]b: cleanup kmalloc()

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Date:   Thu, 24 Mar 2022 18:46:34 +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 08/15] mm/sl[auo]b: cleanup kmalloc()

On 3/8/22 12:41, Hyeonggon Yoo wrote:
> Now that kmalloc() and kmalloc_node() do same job, make kmalloc()
> wrapper of kmalloc_node().
> 
> Remove kmalloc_trace() that is now unused. This patch makes slab
> allocator use kmalloc_node tracepoints in kmalloc().
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

Actually there are more things to fix than the commit log.

> +#ifndef CONFIG_SLOB
> +static __always_inline __alloc_size(1) void *kmalloc_node(size_t size, gfp_t flags, int node)
> +{
> +	if (__builtin_constant_p(size)) {
> +		unsigned int index;
> +
> +		if (size > KMALLOC_MAX_CACHE_SIZE)
> +			return kmalloc_large(size, flags);

Should use kmalloc_large_node().

> +
> +		index = kmalloc_index(size);
> +
> +		if (!index)
> +			return ZERO_SIZE_PTR;
> +
> +		return kmem_cache_alloc_node_trace(
> +				kmalloc_caches[kmalloc_type(flags)][index],
> +						flags, node, size);
> +	}
> +	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(size, flags);

And here.

> +
> +	return __kmalloc_node(size, flags, node);
> +}
> +#endif