linux-kernel - [RFC PATCH v1 05/15] mm/slub: move kmalloc_large_node() to slab

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Date:   Tue,  8 Mar 2022 11:41:32 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     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>,
        Vlastimil Babka <vbabka@...e.cz>,
        Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        linux-kernel@...r.kernel.org, 42.hyeyoo@...il.com
Subject: [RFC PATCH v1 05/15] mm/slub: move kmalloc_large_node() to slab_common.c

In later patch SLAB will also pass requests larger than order-1 page
to page allocator. Move kmalloc_large_node() to slab_common.c.

Fold kmalloc_large_node_hook() into kmalloc_large_node() as there is
no other caller.

Move tracepoint in kmalloc_large_node().

Add flag fix code. This exist in kmalloc_large() but omitted in
kmalloc_large_node().

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
---
 include/linux/slab.h |  3 +++
 mm/slab_common.c     | 26 ++++++++++++++++++++++++
 mm/slub.c            | 47 ++++----------------------------------------
 3 files changed, 33 insertions(+), 43 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index aa14aba2b068..60d27635c13d 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -470,6 +470,9 @@ extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s, gfp_t gfpflags,
 extern void *kmalloc_large(size_t size, gfp_t flags) __assume_page_alignment
 						     __alloc_size(1);
 
+extern void *kmalloc_large_node(size_t size, gfp_t flags, int node)
+				__assume_page_alignment __alloc_size(1);
+
 /**
  * kmalloc - allocate memory
  * @size: how many bytes of memory are required.
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 1ba479f9d143..f61ac7458829 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -956,6 +956,32 @@ void *kmalloc_large(size_t size, gfp_t flags)
 }
 EXPORT_SYMBOL(kmalloc_large);
 
+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);
+	trace_kmalloc_node(_RET_IP_, ptr, size, PAGE_SIZE << order, flags,
+			   node);
+	return ptr;
+
+}
+EXPORT_SYMBOL(kmalloc_large_node);
+
 #ifdef CONFIG_SLAB_FREELIST_RANDOM
 /* Randomize a generic freelist */
 static void freelist_randomize(struct rnd_state *state, unsigned int *list,
diff --git a/mm/slub.c b/mm/slub.c
index 267f700abac1..cdbbf0e97637 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1678,14 +1678,6 @@ static bool freelist_corrupted(struct kmem_cache *s, struct slab *slab,
  * Hooks for other subsystems that check memory allocations. In a typical
  * production configuration these hooks all should produce no code at all.
  */
-static inline void *kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags)
-{
-	ptr = kasan_kmalloc_large(ptr, size, flags);
-	/* As ptr might get tagged, call kmemleak hook after KASAN. */
-	kmemleak_alloc(ptr, size, 1, flags);
-	return ptr;
-}
-
 static __always_inline void kfree_hook(void *x)
 {
 	kmemleak_free(x);
@@ -4387,37 +4379,13 @@ static int __init setup_slub_min_objects(char *str)
 
 __setup("slub_min_objects=", setup_slub_min_objects);
 
-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);
-
-	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);
-	}
-
-	return kmalloc_large_node_hook(ptr, size, flags);
-}
-
 void *__kmalloc_node(size_t size, gfp_t flags, int node)
 {
 	struct kmem_cache *s;
 	void *ret;
 
-	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
-		ret = kmalloc_large_node(size, flags, node);
-
-		trace_kmalloc_node(_RET_IP_, ret,
-				   size, PAGE_SIZE << get_order(size),
-				   flags, node);
-
-		return ret;
-	}
+	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE))
+		return kmalloc_large_node(size, flags, node);
 
 	s = kmalloc_slab(size, flags);
 
@@ -4874,15 +4842,8 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
 	struct kmem_cache *s;
 	void *ret;
 
-	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE)) {
-		ret = kmalloc_large_node(size, gfpflags, node);
-
-		trace_kmalloc_node(caller, ret,
-				   size, PAGE_SIZE << get_order(size),
-				   gfpflags, node);
-
-		return ret;
-	}
+	if (unlikely(size > KMALLOC_MAX_CACHE_SIZE))
+		return kmalloc_large_node(size, gfpflags, node);
 
 	s = kmalloc_slab(size, gfpflags);
 
-- 
2.33.1