From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
Subject: radix tree test suite: add allocation counts and size to kmem_cache

Add functions to get the number of allocations, and total allocations from
a kmem_cache.  Also add a function to get the allocated size and a way to
zero the total allocations.

Link: https://lkml.kernel.org/r/20220426150616.3937571-4-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/radix-tree/linux.c |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

--- a/tools/testing/radix-tree/linux.c~radix-tree-test-suite-add-allocation-counts-and-size-to-kmem_cache
+++ a/tools/testing/radix-tree/linux.c
@@ -24,6 +24,8 @@ struct kmem_cache {
 	void *objs;
 	void (*ctor)(void *);
 	unsigned int non_kernel;
+	unsigned long nr_allocated;
+	unsigned long nr_tallocated;
 };
 
 void kmem_cache_set_non_kernel(struct kmem_cache *cachep, unsigned int val)
@@ -31,6 +33,26 @@ void kmem_cache_set_non_kernel(struct km
 	cachep->non_kernel = val;
 }
 
+unsigned long kmem_cache_get_alloc(struct kmem_cache *cachep)
+{
+	return cachep->size * cachep->nr_allocated;
+}
+
+unsigned long kmem_cache_nr_allocated(struct kmem_cache *cachep)
+{
+	return cachep->nr_allocated;
+}
+
+unsigned long kmem_cache_nr_tallocated(struct kmem_cache *cachep)
+{
+	return cachep->nr_tallocated;
+}
+
+void kmem_cache_zero_nr_tallocated(struct kmem_cache *cachep)
+{
+	cachep->nr_tallocated = 0;
+}
+
 void *kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *lru,
 		int gfp)
 {
@@ -63,7 +85,9 @@ void *kmem_cache_alloc_lru(struct kmem_c
 			memset(p, 0, cachep->size);
 	}
 
+	uatomic_inc(&cachep->nr_allocated);
 	uatomic_inc(&nr_allocated);
+	uatomic_inc(&cachep->nr_tallocated);
 	if (kmalloc_verbose)
 		printf("Allocating %p from slab\n", p);
 	return p;
@@ -73,6 +97,7 @@ void kmem_cache_free(struct kmem_cache *
 {
 	assert(objp);
 	uatomic_dec(&nr_allocated);
+	uatomic_dec(&cachep->nr_allocated);
 	if (kmalloc_verbose)
 		printf("Freeing %p to slab\n", objp);
 	pthread_mutex_lock(&cachep->lock);
@@ -98,6 +123,8 @@ kmem_cache_create(const char *name, unsi
 	ret->size = size;
 	ret->align = align;
 	ret->nr_objs = 0;
+	ret->nr_allocated = 0;
+	ret->nr_tallocated = 0;
 	ret->objs = NULL;
 	ret->ctor = ctor;
 	ret->non_kernel = 0;
_