Re: [PATCH v3 12/15] mm/sl[au]b: generalize kmalloc subsystem

From: Vlastimil Babka
Date: Fri Jul 29 2022 - 06:25:25 EST

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On 7/12/22 15:39, Hyeonggon Yoo wrote:
> Now everything in kmalloc subsystem can be generalized.
> Let's do it!
>
> Generalize __do_kmalloc_node(), __kmalloc_node_track_caller(),
> kfree(), __ksize(), __kmalloc(), __kmalloc_node() and move them
> to slab_common.c.
>
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>

Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>

> ---
> mm/slab.c | 108 -----------------------------------------------
> mm/slab_common.c | 102 ++++++++++++++++++++++++++++++++++++++++++++
> mm/slub.c | 87 --------------------------------------
> 3 files changed, 102 insertions(+), 195 deletions(-)
>
> diff --git a/mm/slab.c b/mm/slab.c
> index 375e35c14430..6407dad13d5c 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -3587,44 +3587,6 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep,
> EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
> #endif
>
> -static __always_inline void *
> -__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller)
> -{
> - struct kmem_cache *cachep;
> - void *ret;
> -
> - if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
> - ret = kmalloc_large_node_notrace(size, flags, node);
> -
> - trace_kmalloc_node(caller, ret, NULL, size,
> - PAGE_SIZE << get_order(size),
> - flags, node);
> - return ret;
> - }
> -
> - cachep = kmalloc_slab(size, flags);
> - if (unlikely(ZERO_OR_NULL_PTR(cachep)))
> - return cachep;
> -
> - ret = kmem_cache_alloc_node_trace(cachep, flags, node, size);
> - ret = kasan_kmalloc(cachep, ret, size, flags);
> -
> - return ret;
> -}
> -
> -void *__kmalloc_node(size_t size, gfp_t flags, int node)
> -{
> - return __do_kmalloc_node(size, flags, node, _RET_IP_);
> -}
> -EXPORT_SYMBOL(__kmalloc_node);
> -
> -void *__kmalloc_node_track_caller(size_t size, gfp_t flags,
> - int node, unsigned long caller)
> -{
> - return __do_kmalloc_node(size, flags, node, caller);
> -}
> -EXPORT_SYMBOL(__kmalloc_node_track_caller);
> -
> #ifdef CONFIG_PRINTK
> void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
> {
> @@ -3647,12 +3609,6 @@ void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab)
> }
> #endif
>
> -void *__kmalloc(size_t size, gfp_t flags)
> -{
> - return __do_kmalloc_node(size, flags, NUMA_NO_NODE, _RET_IP_);
> -}
> -EXPORT_SYMBOL(__kmalloc);
> -
> static __always_inline
> void __do_kmem_cache_free(struct kmem_cache *cachep, void *objp,
> unsigned long caller)
> @@ -3730,43 +3686,6 @@ void kmem_cache_free_bulk(struct kmem_cache *orig_s, size_t size, void **p)
> }
> EXPORT_SYMBOL(kmem_cache_free_bulk);
>
> -/**
> - * kfree - free previously allocated memory
> - * @objp: pointer returned by kmalloc.
> - *
> - * If @objp is NULL, no operation is performed.
> - *
> - * Don't free memory not originally allocated by kmalloc()
> - * or you will run into trouble.
> - */
> -void kfree(const void *objp)
> -{
> - struct kmem_cache *c;
> - unsigned long flags;
> - struct folio *folio;
> -
> - trace_kfree(_RET_IP_, objp);
> -
> - if (unlikely(ZERO_OR_NULL_PTR(objp)))
> - return;
> -
> - folio = virt_to_folio(objp);
> - if (!folio_test_slab(folio)) {
> - free_large_kmalloc(folio, (void *)objp);
> - return;
> - }
> -
> - c = folio_slab(folio)->slab_cache;
> -
> - local_irq_save(flags);
> - kfree_debugcheck(objp);
> - debug_check_no_locks_freed(objp, c->object_size);
> - debug_check_no_obj_freed(objp, c->object_size);
> - __cache_free(c, (void *)objp, _RET_IP_);
> - local_irq_restore(flags);
> -}
> -EXPORT_SYMBOL(kfree);
> -
> /*
> * This initializes kmem_cache_node or resizes various caches for all nodes.
> */
> @@ -4169,30 +4088,3 @@ void __check_heap_object(const void *ptr, unsigned long n,
> usercopy_abort("SLAB object", cachep->name, to_user, offset, n);
> }
> #endif /* CONFIG_HARDENED_USERCOPY */
> -
> -/**
> - * __ksize -- Uninstrumented ksize.
> - * @objp: pointer to the object
> - *
> - * Unlike ksize(), __ksize() is uninstrumented, and does not provide the same
> - * safety checks as ksize() with KASAN instrumentation enabled.
> - *
> - * Return: size of the actual memory used by @objp in bytes
> - */
> -size_t __ksize(const void *objp)
> -{
> - struct kmem_cache *c;
> - struct folio *folio;
> -
> - BUG_ON(!objp);
> - if (unlikely(objp == ZERO_SIZE_PTR))
> - return 0;
> -
> - folio = virt_to_folio(objp);
> - if (!folio_test_slab(folio))
> - return folio_size(folio);
> -
> - c = folio_slab(folio)->slab_cache;
> - return c->object_size;
> -}
> -EXPORT_SYMBOL(__ksize);
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index 0dff46fb7193..1000e05c77df 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -924,6 +924,108 @@ void free_large_kmalloc(struct folio *folio, void *object)
> -(PAGE_SIZE << order));
> __free_pages(folio_page(folio, 0), order);
> }
> +
> +static __always_inline
> +void *__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller)
> +{
> + struct kmem_cache *s;
> + void *ret;
> +
> + if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
> + ret = kmalloc_large_node_notrace(size, flags, node);
> + trace_kmalloc_node(caller, ret, NULL,
> + size, PAGE_SIZE << get_order(size),
> + flags, node);
> + return ret;
> + }
> +
> + s = kmalloc_slab(size, flags);
> +
> + if (unlikely(ZERO_OR_NULL_PTR(s)))
> + return s;
> +
> + ret = __kmem_cache_alloc_node(s, flags, node, size, caller);
> + ret = kasan_kmalloc(s, ret, size, flags);
> + trace_kmalloc_node(caller, ret, s, size,
> + s->size, flags, node);
> + return ret;
> +}
> +
> +void *__kmalloc_node(size_t size, gfp_t flags, int node)
> +{
> + return __do_kmalloc_node(size, flags, node, _RET_IP_);
> +}
> +EXPORT_SYMBOL(__kmalloc_node);
> +
> +void *__kmalloc(size_t size, gfp_t flags)
> +{
> + return __do_kmalloc_node(size, flags, NUMA_NO_NODE, _RET_IP_);
> +}
> +EXPORT_SYMBOL(__kmalloc);
> +
> +void *__kmalloc_node_track_caller(size_t size, gfp_t flags,
> + int node, unsigned long caller)
> +{
> + return __do_kmalloc_node(size, flags, node, caller);
> +}
> +EXPORT_SYMBOL(__kmalloc_node_track_caller);
> +
> +/**
> + * kfree - free previously allocated memory
> + * @objp: pointer returned by kmalloc.
> + *
> + * If @objp is NULL, no operation is performed.
> + *
> + * Don't free memory not originally allocated by kmalloc()
> + * or you will run into trouble.
> + */
> +void kfree(const void *object)
> +{
> + struct folio *folio;
> + struct slab *slab;
> + struct kmem_cache *s;
> +
> + trace_kfree(_RET_IP_, object);
> +
> + if (unlikely(ZERO_OR_NULL_PTR(object)))
> + return;
> +
> + folio = virt_to_folio(object);
> + if (unlikely(!folio_test_slab(folio))) {
> + free_large_kmalloc(folio, (void *)object);
> + return;
> + }
> +
> + slab = folio_slab(folio);
> + s = slab->slab_cache;
> + __kmem_cache_free(s, (void *)object, _RET_IP_);
> +}
> +EXPORT_SYMBOL(kfree);
> +
> +/**
> + * __ksize -- Uninstrumented ksize.
> + * @objp: pointer to the object
> + *
> + * Unlike ksize(), __ksize() is uninstrumented, and does not provide the same
> + * safety checks as ksize() with KASAN instrumentation enabled.
> + *
> + * Return: size of the actual memory used by @objp in bytes
> + */
> +size_t __ksize(const void *object)
> +{
> + struct folio *folio;
> +
> + if (unlikely(object == ZERO_SIZE_PTR))
> + return 0;
> +
> + folio = virt_to_folio(object);
> +
> + if (unlikely(!folio_test_slab(folio)))
> + return folio_size(folio);
> +
> + return slab_ksize(folio_slab(folio)->slab_cache);
> +}
> +EXPORT_SYMBOL(__ksize);
> #endif /* !CONFIG_SLOB */
>
> gfp_t kmalloc_fix_flags(gfp_t flags)
> diff --git a/mm/slub.c b/mm/slub.c
> index 74eb78678c98..836292c32e58 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -4388,49 +4388,6 @@ static int __init setup_slub_min_objects(char *str)
>
> __setup("slub_min_objects=", setup_slub_min_objects);
>
> -static __always_inline
> -void *__do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller)
> -{
> - struct kmem_cache *s;
> - void *ret;
> -
> - if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
> - ret = kmalloc_large_node_notrace(size, flags, node);
> -
> - trace_kmalloc_node(caller, ret, NULL,
> - size, PAGE_SIZE << get_order(size),
> - flags, node);
> -
> - return ret;
> - }
> -
> - s = kmalloc_slab(size, flags);
> -
> - if (unlikely(ZERO_OR_NULL_PTR(s)))
> - return s;
> -
> - ret = slab_alloc_node(s, NULL, flags, node, caller, size);
> -
> - trace_kmalloc_node(caller, ret, s, size, s->size, flags, node);
> -
> - ret = kasan_kmalloc(s, ret, size, flags);
> -
> - return ret;
> -}
> -
> -void *__kmalloc_node(size_t size, gfp_t flags, int node)
> -{
> - return __do_kmalloc_node(size, flags, node, _RET_IP_);
> -}
> -EXPORT_SYMBOL(__kmalloc_node);
> -
> -void *__kmalloc(size_t size, gfp_t flags)
> -{
> - return __do_kmalloc_node(size, flags, NUMA_NO_NODE, _RET_IP_);
> -}
> -EXPORT_SYMBOL(__kmalloc);
> -
> -
> #ifdef CONFIG_HARDENED_USERCOPY
> /*
> * Rejects incorrectly sized objects and objects that are to be copied
> @@ -4481,43 +4438,6 @@ void __check_heap_object(const void *ptr, unsigned long n,
> }
> #endif /* CONFIG_HARDENED_USERCOPY */
>
> -size_t __ksize(const void *object)
> -{
> - struct folio *folio;
> -
> - if (unlikely(object == ZERO_SIZE_PTR))
> - return 0;
> -
> - folio = virt_to_folio(object);
> -
> - if (unlikely(!folio_test_slab(folio)))
> - return folio_size(folio);
> -
> - return slab_ksize(folio_slab(folio)->slab_cache);
> -}
> -EXPORT_SYMBOL(__ksize);
> -
> -void kfree(const void *x)
> -{
> - struct folio *folio;
> - struct slab *slab;
> - void *object = (void *)x;
> -
> - trace_kfree(_RET_IP_, x);
> -
> - if (unlikely(ZERO_OR_NULL_PTR(x)))
> - return;
> -
> - folio = virt_to_folio(x);
> - if (unlikely(!folio_test_slab(folio))) {
> - free_large_kmalloc(folio, object);
> - return;
> - }
> - slab = folio_slab(folio);
> - slab_free(slab->slab_cache, slab, object, NULL, &object, 1, _RET_IP_);
> -}
> -EXPORT_SYMBOL(kfree);
> -
> #define SHRINK_PROMOTE_MAX 32
>
> /*
> @@ -4863,13 +4783,6 @@ int __kmem_cache_create(struct kmem_cache *s, slab_flags_t flags)
> return 0;
> }
>
> -void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
> - int node, unsigned long caller)
> -{
> - return __do_kmalloc_node(size, gfpflags, node, caller);
> -}
> -EXPORT_SYMBOL(__kmalloc_node_track_caller);
> -
> #ifdef CONFIG_SYSFS
> static int count_inuse(struct slab *slab)
> {

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