linux-kernel - Re: [PATCH v3 11/15] mm/sl[au]b: introduce common alloc/free functions without tracepoint

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Date:   Fri, 29 Jul 2022 11:49:10 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        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>,
        Joe Perches <joe@...ches.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        Matthew WilCox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3 11/15] mm/sl[au]b: introduce common alloc/free
 functions without tracepoint

On 7/12/22 15:39, Hyeonggon Yoo wrote:
> To unify kmalloc functions in later patch, introduce common alloc/free
> functions that does not have tracepoint.
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>

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

> ---
> 
> v3: 
>    Tried to avoid affecting existing functions.
> 
>  mm/slab.c | 36 +++++++++++++++++++++++++++++-------
>  mm/slab.h |  4 ++++
>  mm/slub.c | 13 +++++++++++++
>  3 files changed, 46 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/slab.c b/mm/slab.c
> index a2f43425a0ae..375e35c14430 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3560,6 +3560,14 @@ void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
>  }
>  EXPORT_SYMBOL(kmem_cache_alloc_node);
>  
> +void *__kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
> +			     int nodeid, size_t orig_size,
> +			     unsigned long caller)
> +{
> +	return slab_alloc_node(cachep, NULL, flags, nodeid,
> +			       orig_size, caller);
> +}
> +
>  #ifdef CONFIG_TRACING
>  void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep,
>  				  gfp_t flags,
> @@ -3645,6 +3653,26 @@ void *__kmalloc(size_t size, gfp_t flags)
>  }
>  EXPORT_SYMBOL(__kmalloc);
>  
> +static __always_inline
> +void __do_kmem_cache_free(struct kmem_cache *cachep, void *objp,
> +			  unsigned long caller)
> +{
> +	unsigned long flags;
> +
> +	local_irq_save(flags);
> +	debug_check_no_locks_freed(objp, cachep->object_size);
> +	if (!(cachep->flags & SLAB_DEBUG_OBJECTS))
> +		debug_check_no_obj_freed(objp, cachep->object_size);
> +	__cache_free(cachep, objp, caller);
> +	local_irq_restore(flags);
> +}
> +
> +void __kmem_cache_free(struct kmem_cache *cachep, void *objp,
> +		       unsigned long caller)
> +{
> +	__do_kmem_cache_free(cachep, objp, caller);
> +}
> +
>  /**
>   * kmem_cache_free - Deallocate an object
>   * @cachep: The cache the allocation was from.
> @@ -3655,18 +3683,12 @@ EXPORT_SYMBOL(__kmalloc);
>   */
>  void kmem_cache_free(struct kmem_cache *cachep, void *objp)
>  {
> -	unsigned long flags;
>  	cachep = cache_from_obj(cachep, objp);
>  	if (!cachep)
>  		return;
>  
>  	trace_kmem_cache_free(_RET_IP_, objp, cachep->name);
> -	local_irq_save(flags);
> -	debug_check_no_locks_freed(objp, cachep->object_size);
> -	if (!(cachep->flags & SLAB_DEBUG_OBJECTS))
> -		debug_check_no_obj_freed(objp, cachep->object_size);
> -	__cache_free(cachep, objp, _RET_IP_);
> -	local_irq_restore(flags);
> +	__do_kmem_cache_free(cachep, objp, _RET_IP_);
>  }
>  EXPORT_SYMBOL(kmem_cache_free);
>  
> diff --git a/mm/slab.h b/mm/slab.h
> index c81c92d421f1..9193e9c1f040 100644
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -275,6 +275,10 @@ void create_kmalloc_caches(slab_flags_t);
>  struct kmem_cache *kmalloc_slab(size_t, gfp_t);
>  
>  void *kmalloc_large_node_notrace(size_t size, gfp_t flags, int node);
> +void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags,
> +			      int node, size_t orig_size,
> +			      unsigned long caller);
> +void __kmem_cache_free(struct kmem_cache *s, void *x, unsigned long caller);
>  #endif
>  
>  gfp_t kmalloc_fix_flags(gfp_t flags);
> diff --git a/mm/slub.c b/mm/slub.c
> index 6cb7ca27f3b7..74eb78678c98 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -3262,6 +3262,14 @@ void *kmem_cache_alloc_lru(struct kmem_cache *s, struct list_lru *lru,
>  }
>  EXPORT_SYMBOL(kmem_cache_alloc_lru);
>  
> +void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags,
> +			      int node, size_t orig_size,
> +			      unsigned long caller)
> +{
> +	return slab_alloc_node(s, NULL, gfpflags, node,
> +			       caller, orig_size);
> +}
> +
>  #ifdef CONFIG_TRACING
>  void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
>  {
> @@ -3526,6 +3534,11 @@ void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr)
>  }
>  #endif
>  
> +void __kmem_cache_free(struct kmem_cache *s, void *x, unsigned long caller)
> +{
> +	slab_free(s, virt_to_slab(x), x, NULL, &x, 1, caller);
> +}
> +
>  void kmem_cache_free(struct kmem_cache *s, void *x)
>  {
>  	s = cache_from_obj(s, x);