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Date: Wed, 27 Apr 2022 09:50:06 +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, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v2 12/23] mm/slab_common: cleanup kmalloc()
On 4/14/22 10:57, Hyeonggon Yoo wrote:
> Now that kmalloc() and kmalloc_node() do same job, make kmalloc()
> wrapper of kmalloc_node().
>
> Remove kmem_cache_alloc_trace() that is now unused.
>
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
>From correctness point of view:
Reviewed-by: Vlastimil Babka <vbabka@...e.cz>
But yeah, impact of requiring NUMA_NO_NODE parameter should be evaluated. If
it's significant I believe we should be still able to implement the common
kmalloc, but keep separate kmalloc and kmalloc_node entry points.
> ---
> include/linux/slab.h | 93 +++++++++++++++-----------------------------
> mm/slab.c | 16 --------
> mm/slub.c | 12 ------
> 3 files changed, 32 insertions(+), 89 deletions(-)
>
> diff --git a/include/linux/slab.h b/include/linux/slab.h
> index eb457f20f415..ea168f8a248d 100644
> --- a/include/linux/slab.h
> +++ b/include/linux/slab.h
> @@ -497,23 +497,10 @@ static __always_inline void kfree_bulk(size_t size, void **p)
> }
>
> #ifdef CONFIG_TRACING
> -extern void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t flags, size_t size)
> - __assume_slab_alignment __alloc_size(3);
> -
> extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
> int node, size_t size) __assume_slab_alignment
> __alloc_size(4);
> -
> #else /* CONFIG_TRACING */
> -static __always_inline __alloc_size(3) void *kmem_cache_alloc_trace(struct kmem_cache *s,
> - gfp_t flags, size_t size)
> -{
> - void *ret = kmem_cache_alloc(s, flags);
> -
> - ret = kasan_kmalloc(s, ret, size, flags);
> - return ret;
> -}
> -
> static __always_inline void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
> int node, size_t size)
> {
> @@ -532,6 +519,37 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
> return kmalloc_large_node(size, flags, NUMA_NO_NODE);
> }
>
> +#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_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)][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_node(size, flags, node);
> +
> + return __kmalloc_node(size, flags, node);
> +}
> +#endif
> +
> +
> /**
> * kmalloc - allocate memory
> * @size: how many bytes of memory are required.
> @@ -588,55 +606,8 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
> */
> static __always_inline __alloc_size(1) void *kmalloc(size_t size, gfp_t flags)
> {
> - if (__builtin_constant_p(size)) {
> -#ifndef CONFIG_SLOB
> - unsigned int index;
> -#endif
> - if (size > KMALLOC_MAX_CACHE_SIZE)
> - return kmalloc_large(size, flags);
> -#ifndef CONFIG_SLOB
> - index = kmalloc_index(size);
> -
> - if (!index)
> - return ZERO_SIZE_PTR;
> -
> - return kmem_cache_alloc_trace(
> - kmalloc_caches[kmalloc_type(flags)][index],
> - flags, size);
> -#endif
> - }
> - return __kmalloc(size, flags);
> -}
> -
> -#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_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)][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_node(size, flags, node);
> -
> - return __kmalloc_node(size, flags, node);
> + return kmalloc_node(size, flags, NUMA_NO_NODE);
> }
> -#endif
>
> /**
> * kmalloc_array - allocate memory for an array.
> diff --git a/mm/slab.c b/mm/slab.c
> index c5ffe54c207a..b0aaca017f42 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3507,22 +3507,6 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
> }
> EXPORT_SYMBOL(kmem_cache_alloc_bulk);
>
> -#ifdef CONFIG_TRACING
> -void *
> -kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size)
> -{
> - void *ret;
> -
> - ret = slab_alloc(cachep, NULL, flags, size, _RET_IP_);
> -
> - ret = kasan_kmalloc(cachep, ret, size, flags);
> - trace_kmalloc(_RET_IP_, ret,
> - size, cachep->size, flags);
> - return ret;
> -}
> -EXPORT_SYMBOL(kmem_cache_alloc_trace);
> -#endif
> -
> #ifdef CONFIG_TRACING
> void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep,
> gfp_t flags,
> diff --git a/mm/slub.c b/mm/slub.c
> index 2a2be2a8a5d0..892988990da7 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -3216,18 +3216,6 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, struct list_lru *l
> return slab_alloc_node(s, lru, gfpflags, NUMA_NO_NODE, addr, orig_size);
> }
>
> -
> -#ifdef CONFIG_TRACING
> -void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
> -{
> - void *ret = slab_alloc(s, NULL, gfpflags, _RET_IP_, size);
> - trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags);
> - ret = kasan_kmalloc(s, ret, size, gfpflags);
> - return ret;
> -}
> -EXPORT_SYMBOL(kmem_cache_alloc_trace);
> -#endif
> -
> void *__kmem_cache_alloc_node(struct kmem_cache *s, struct list_lru *lru, gfp_t gfpflags,
> int node, unsigned long caller __maybe_unused)
> {
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