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Date:   Mon,  1 May 2023 09:54:37 -0700
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Subject: [PATCH 27/40] mempool: Hook up to memory allocation profiling
From:   Suren Baghdasaryan <surenb@google.com>
To:     akpm@linux-foundation.org
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From: Kent Overstreet <kent.overstreet@linux.dev>

This adds hooks to mempools for correctly annotating mempool-backed
allocations at the correct source line, so they show up correctly in
/sys/kernel/debug/allocations.

Various inline functions are converted to wrappers so that we can invoke
alloc_hooks() in fewer places.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 include/linux/mempool.h | 73 ++++++++++++++++++++---------------------
 mm/mempool.c            | 28 ++++++----------
 2 files changed, 45 insertions(+), 56 deletions(-)

diff --git a/include/linux/mempool.h b/include/linux/mempool.h
index 4aae6c06c5f2..aa6e886b01d7 100644
--- a/include/linux/mempool.h
+++ b/include/linux/mempool.h
@@ -5,6 +5,8 @@
 #ifndef _LINUX_MEMPOOL_H
 #define _LINUX_MEMPOOL_H
 
+#include <linux/sched.h>
+#include <linux/alloc_tag.h>
 #include <linux/wait.h>
 #include <linux/compiler.h>
 
@@ -39,18 +41,32 @@ void mempool_exit(mempool_t *pool);
 int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
 		      mempool_free_t *free_fn, void *pool_data,
 		      gfp_t gfp_mask, int node_id);
-int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
+
+int _mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
 		 mempool_free_t *free_fn, void *pool_data);
+#define mempool_init(...)			\
+	alloc_hooks(_mempool_init(__VA_ARGS__), int, -ENOMEM)
 
 extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
 			mempool_free_t *free_fn, void *pool_data);
-extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
+
+extern mempool_t *_mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
 			mempool_free_t *free_fn, void *pool_data,
 			gfp_t gfp_mask, int nid);
+#define mempool_create_node(...)			\
+	alloc_hooks(_mempool_create_node(__VA_ARGS__), mempool_t *, NULL)
+
+#define mempool_create(_min_nr, _alloc_fn, _free_fn, _pool_data)	\
+	mempool_create_node(_min_nr, _alloc_fn, _free_fn, _pool_data,	\
+			    GFP_KERNEL, NUMA_NO_NODE)
 
 extern int mempool_resize(mempool_t *pool, int new_min_nr);
 extern void mempool_destroy(mempool_t *pool);
-extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc;
+
+extern void *_mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc;
+#define mempool_alloc(_pool, _gfp)			\
+	alloc_hooks(_mempool_alloc((_pool), (_gfp)), void *, NULL)
+
 extern void mempool_free(void *element, mempool_t *pool);
 
 /*
@@ -61,19 +77,10 @@ extern void mempool_free(void *element, mempool_t *pool);
 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
 void mempool_free_slab(void *element, void *pool_data);
 
-static inline int
-mempool_init_slab_pool(mempool_t *pool, int min_nr, struct kmem_cache *kc)
-{
-	return mempool_init(pool, min_nr, mempool_alloc_slab,
-			    mempool_free_slab, (void *) kc);
-}
-
-static inline mempool_t *
-mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
-{
-	return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
-			      (void *) kc);
-}
+#define mempool_init_slab_pool(_pool, _min_nr, _kc)			\
+	mempool_init(_pool, (_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
+#define mempool_create_slab_pool(_min_nr, _kc)			\
+	mempool_create((_min_nr), mempool_alloc_slab, mempool_free_slab, (void *)(_kc))
 
 /*
  * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
@@ -82,17 +89,12 @@ mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
 void mempool_kfree(void *element, void *pool_data);
 
-static inline int mempool_init_kmalloc_pool(mempool_t *pool, int min_nr, size_t size)
-{
-	return mempool_init(pool, min_nr, mempool_kmalloc,
-			    mempool_kfree, (void *) size);
-}
-
-static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
-{
-	return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
-			      (void *) size);
-}
+#define mempool_init_kmalloc_pool(_pool, _min_nr, _size)		\
+	mempool_init(_pool, (_min_nr), mempool_kmalloc, mempool_kfree,	\
+		     (void *)(unsigned long)(_size))
+#define mempool_create_kmalloc_pool(_min_nr, _size)			\
+	mempool_create((_min_nr), mempool_kmalloc, mempool_kfree,	\
+		       (void *)(unsigned long)(_size))
 
 /*
  * A mempool_alloc_t and mempool_free_t for a simple page allocator that
@@ -101,16 +103,11 @@ static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
 void mempool_free_pages(void *element, void *pool_data);
 
-static inline int mempool_init_page_pool(mempool_t *pool, int min_nr, int order)
-{
-	return mempool_init(pool, min_nr, mempool_alloc_pages,
-			    mempool_free_pages, (void *)(long)order);
-}
-
-static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
-{
-	return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
-			      (void *)(long)order);
-}
+#define mempool_init_page_pool(_pool, _min_nr, _order)			\
+	mempool_init(_pool, (_min_nr), mempool_alloc_pages,		\
+		     mempool_free_pages, (void *)(long)(_order))
+#define mempool_create_page_pool(_min_nr, _order)			\
+	mempool_create((_min_nr), mempool_alloc_pages,			\
+		       mempool_free_pages, (void *)(long)(_order))
 
 #endif /* _LINUX_MEMPOOL_H */
diff --git a/mm/mempool.c b/mm/mempool.c
index 734bcf5afbb7..4fc90735853c 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -230,17 +230,17 @@ EXPORT_SYMBOL(mempool_init_node);
  *
  * Return: %0 on success, negative error code otherwise.
  */
-int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
+int _mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
 		 mempool_free_t *free_fn, void *pool_data)
 {
 	return mempool_init_node(pool, min_nr, alloc_fn, free_fn,
 				 pool_data, GFP_KERNEL, NUMA_NO_NODE);
 
 }
-EXPORT_SYMBOL(mempool_init);
+EXPORT_SYMBOL(_mempool_init);
 
 /**
- * mempool_create - create a memory pool
+ * mempool_create_node - create a memory pool
  * @min_nr:    the minimum number of elements guaranteed to be
  *             allocated for this pool.
  * @alloc_fn:  user-defined element-allocation function.
@@ -255,15 +255,7 @@ EXPORT_SYMBOL(mempool_init);
  *
  * Return: pointer to the created memory pool object or %NULL on error.
  */
-mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
-				mempool_free_t *free_fn, void *pool_data)
-{
-	return mempool_create_node(min_nr, alloc_fn, free_fn, pool_data,
-				   GFP_KERNEL, NUMA_NO_NODE);
-}
-EXPORT_SYMBOL(mempool_create);
-
-mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
+mempool_t *_mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
 			       mempool_free_t *free_fn, void *pool_data,
 			       gfp_t gfp_mask, int node_id)
 {
@@ -281,7 +273,7 @@ mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
 
 	return pool;
 }
-EXPORT_SYMBOL(mempool_create_node);
+EXPORT_SYMBOL(_mempool_create_node);
 
 /**
  * mempool_resize - resize an existing memory pool
@@ -377,7 +369,7 @@ EXPORT_SYMBOL(mempool_resize);
  *
  * Return: pointer to the allocated element or %NULL on error.
  */
-void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
+void *_mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
 {
 	void *element;
 	unsigned long flags;
@@ -444,7 +436,7 @@ void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
 	finish_wait(&pool->wait, &wait);
 	goto repeat_alloc;
 }
-EXPORT_SYMBOL(mempool_alloc);
+EXPORT_SYMBOL(_mempool_alloc);
 
 /**
  * mempool_free - return an element to the pool.
@@ -515,7 +507,7 @@ void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data)
 {
 	struct kmem_cache *mem = pool_data;
 	VM_BUG_ON(mem->ctor);
-	return kmem_cache_alloc(mem, gfp_mask);
+	return _kmem_cache_alloc(mem, gfp_mask);
 }
 EXPORT_SYMBOL(mempool_alloc_slab);
 
@@ -533,7 +525,7 @@ EXPORT_SYMBOL(mempool_free_slab);
 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data)
 {
 	size_t size = (size_t)pool_data;
-	return kmalloc(size, gfp_mask);
+	return _kmalloc(size, gfp_mask);
 }
 EXPORT_SYMBOL(mempool_kmalloc);
 
@@ -550,7 +542,7 @@ EXPORT_SYMBOL(mempool_kfree);
 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data)
 {
 	int order = (int)(long)pool_data;
-	return alloc_pages(gfp_mask, order);
+	return _alloc_pages(gfp_mask, order);
 }
 EXPORT_SYMBOL(mempool_alloc_pages);
 
-- 
2.40.1.495.gc816e09b53d-goog