[PATCH v2 18/21] mm/slab: move kmalloc() functions from slab_common.c to slub.c

Vlastimil Babka
2023-11-20T18:34:45Z

This will eliminate a call between compilation units through
__kmem_cache_alloc_node() and allow better inlining of the allocation
fast path.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
mm/slab.h | 3 --
mm/slab_common.c | 119 ----------------------------------------------------
mm/slub.c | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 118 insertions(+), 130 deletions(-)

diff --git a/mm/slab.h b/mm/slab.h
index 7d7cc7af614e..54deeb0428c6 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -416,9 +416,6 @@ kmalloc_slab(size_t size, gfp_t flags, unsigned long caller)
return kmalloc_caches[kmalloc_type(flags, caller)][index];
}

-void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags,
- int node, size_t orig_size,
- unsigned long caller);
gfp_t kmalloc_fix_flags(gfp_t flags);

/* Functions provided by the slab allocators */
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 31ade17a7ad9..238293b1dbe1 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -936,50 +936,6 @@ void __init create_kmalloc_caches(slab_flags_t flags)
slab_state = UP;
}

-static void *__kmalloc_large_node(size_t size, gfp_t flags, int node);
-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(size, flags, node);
- trace_kmalloc(caller, ret, size,
- PAGE_SIZE << get_order(size), flags, node);
- return ret;
- }
-
- if (unlikely(!size))
- return ZERO_SIZE_PTR;
-
- s = kmalloc_slab(size, flags, caller);
-
- ret = __kmem_cache_alloc_node(s, flags, node, size, caller);
- ret = kasan_kmalloc(s, ret, size, flags);
- trace_kmalloc(caller, ret, 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);
-
/**
* __ksize -- Report full size of underlying allocation
* @object: pointer to the object
@@ -1016,30 +972,6 @@ size_t __ksize(const void *object)
return slab_ksize(folio_slab(folio)->slab_cache);
}

-void *kmalloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
-{
- void *ret = __kmem_cache_alloc_node(s, gfpflags, NUMA_NO_NODE,
- size, _RET_IP_);
-
- trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags, NUMA_NO_NODE);
-
- ret = kasan_kmalloc(s, ret, size, gfpflags);
- return ret;
-}
-EXPORT_SYMBOL(kmalloc_trace);
-
-void *kmalloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
- int node, size_t size)
-{
- void *ret = __kmem_cache_alloc_node(s, gfpflags, node, size, _RET_IP_);
-
- trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags, node);
-
- ret = kasan_kmalloc(s, ret, size, gfpflags);
- return ret;
-}
-EXPORT_SYMBOL(kmalloc_node_trace);
-
gfp_t kmalloc_fix_flags(gfp_t flags)
{
gfp_t invalid_mask = flags & GFP_SLAB_BUG_MASK;
@@ -1052,57 +984,6 @@ gfp_t kmalloc_fix_flags(gfp_t flags)
return flags;
}

-/*
- * To avoid unnecessary overhead, we pass through large allocation requests
- * directly to the page allocator. We use __GFP_COMP, because we will need to
- * know the allocation order to free the pages properly in kfree.
- */
-
-static void *__kmalloc_large_node(size_t size, gfp_t flags, int node)
-{
- struct page *page;
- void *ptr = NULL;
- unsigned int order = get_order(size);
-
- if (unlikely(flags & GFP_SLAB_BUG_MASK))
- flags = kmalloc_fix_flags(flags);
-
- flags |= __GFP_COMP;
- page = alloc_pages_node(node, flags, order);
- if (page) {
- ptr = page_address(page);
- mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
- PAGE_SIZE << order);
- }
-
- ptr = kasan_kmalloc_large(ptr, size, flags);
- /* As ptr might get tagged, call kmemleak hook after KASAN. */
- kmemleak_alloc(ptr, size, 1, flags);
- kmsan_kmalloc_large(ptr, size, flags);
-
- return ptr;
-}
-
-void *kmalloc_large(size_t size, gfp_t flags)
-{
- void *ret = __kmalloc_large_node(size, flags, NUMA_NO_NODE);
-
- trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
- flags, NUMA_NO_NODE);
- return ret;
-}
-EXPORT_SYMBOL(kmalloc_large);
-
-void *kmalloc_large_node(size_t size, gfp_t flags, int node)
-{
- void *ret = __kmalloc_large_node(size, flags, node);
-
- trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
- flags, node);
- return ret;
-}
-EXPORT_SYMBOL(kmalloc_large_node);
-
#ifdef CONFIG_SLAB_FREELIST_RANDOM
/* Randomize a generic freelist */
static void freelist_randomize(unsigned int *list,
diff --git a/mm/slub.c b/mm/slub.c
index 2baa9e94d9df..d6bc15929d22 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3851,14 +3851,6 @@ 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);
-}
-
/**
* kmem_cache_alloc_node - Allocate an object on the specified node
* @s: The cache to allocate from.
@@ -3882,6 +3874,124 @@ void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
}
EXPORT_SYMBOL(kmem_cache_alloc_node);

+/*
+ * To avoid unnecessary overhead, we pass through large allocation requests
+ * directly to the page allocator. We use __GFP_COMP, because we will need to
+ * know the allocation order to free the pages properly in kfree.
+ */
+static void *__kmalloc_large_node(size_t size, gfp_t flags, int node)
+{
+ struct page *page;
+ void *ptr = NULL;
+ unsigned int order = get_order(size);
+
+ if (unlikely(flags & GFP_SLAB_BUG_MASK))
+ flags = kmalloc_fix_flags(flags);
+
+ flags |= __GFP_COMP;
+ page = alloc_pages_node(node, flags, order);
+ if (page) {
+ ptr = page_address(page);
+ mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
+ PAGE_SIZE << order);
+ }
+
+ ptr = kasan_kmalloc_large(ptr, size, flags);
+ /* As ptr might get tagged, call kmemleak hook after KASAN. */
+ kmemleak_alloc(ptr, size, 1, flags);
+ kmsan_kmalloc_large(ptr, size, flags);
+
+ return ptr;
+}
+
+void *kmalloc_large(size_t size, gfp_t flags)
+{
+ void *ret = __kmalloc_large_node(size, flags, NUMA_NO_NODE);
+
+ trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
+ flags, NUMA_NO_NODE);
+ return ret;
+}
+EXPORT_SYMBOL(kmalloc_large);
+
+void *kmalloc_large_node(size_t size, gfp_t flags, int node)
+{
+ void *ret = __kmalloc_large_node(size, flags, node);
+
+ trace_kmalloc(_RET_IP_, ret, size, PAGE_SIZE << get_order(size),
+ flags, node);
+ return ret;
+}
+EXPORT_SYMBOL(kmalloc_large_node);
+
+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(size, flags, node);
+ trace_kmalloc(caller, ret, size,
+ PAGE_SIZE << get_order(size), flags, node);
+ return ret;
+ }
+
+ if (unlikely(!size))
+ return ZERO_SIZE_PTR;
+
+ s = kmalloc_slab(size, flags, caller);
+
+ ret = slab_alloc_node(s, NULL, flags, node, caller, size);
+ ret = kasan_kmalloc(s, ret, size, flags);
+ trace_kmalloc(caller, ret, 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);
+
+void *kmalloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
+{
+ void *ret = slab_alloc_node(s, NULL, gfpflags, NUMA_NO_NODE,
+ _RET_IP_, size);
+
+ trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags, NUMA_NO_NODE);
+
+ ret = kasan_kmalloc(s, ret, size, gfpflags);
+ return ret;
+}
+EXPORT_SYMBOL(kmalloc_trace);
+
+void *kmalloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
+ int node, size_t size)
+{
+ void *ret = slab_alloc_node(s, NULL, gfpflags, node, _RET_IP_, size);
+
+ trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags, node);
+
+ ret = kasan_kmalloc(s, ret, size, gfpflags);
+ return ret;
+}
+EXPORT_SYMBOL(kmalloc_node_trace);
+
static noinline void free_to_partial_list(
struct kmem_cache *s, struct slab *slab,
void *head, void *tail, int bulk_cnt,

--
2.42.1