From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Allocate a sheaf and fill it to the count amount. Does not fill to the
sheaf limit to detect incorrect allocation requests.
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
tools/include/linux/slab.h | 24 +++++++++++++
tools/testing/shared/linux.c | 84 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 108 insertions(+)
diff --git a/tools/include/linux/slab.h b/tools/include/linux/slab.h
index a475364cfd9fcdb10db252aab18ea3a620326b6b..0b6b42c9921fc402b4f3d4f681a95c9067d128db 100644
--- a/tools/include/linux/slab.h
+++ b/tools/include/linux/slab.h
@@ -22,6 +22,13 @@ enum slab_state {
FULL
};
+struct slab_sheaf {
+ struct kmem_cache *cache;
+ unsigned int size;
+ unsigned int capacity;
+ void *objects[];
+};
+
struct kmem_cache_args {
unsigned int align;
unsigned int sheaf_capacity;
@@ -79,4 +86,21 @@ void kmem_cache_free_bulk(struct kmem_cache *cachep, size_t size, void **list);
int kmem_cache_alloc_bulk(struct kmem_cache *cachep, gfp_t gfp, size_t size,
void **list);
+struct slab_sheaf *
+kmem_cache_prefill_sheaf(struct kmem_cache *s, gfp_t gfp, unsigned int size);
+
+void *
+kmem_cache_alloc_from_sheaf(struct kmem_cache *s, gfp_t gfp,
+ struct slab_sheaf *sheaf);
+
+void kmem_cache_return_sheaf(struct kmem_cache *s, gfp_t gfp,
+ struct slab_sheaf *sheaf);
+int kmem_cache_refill_sheaf(struct kmem_cache *s, gfp_t gfp,
+ struct slab_sheaf **sheafp, unsigned int size);
+
+static inline unsigned int kmem_cache_sheaf_size(struct slab_sheaf *sheaf)
+{
+ return sheaf->size;
+}
+
#endif /* _TOOLS_SLAB_H */
diff --git a/tools/testing/shared/linux.c b/tools/testing/shared/linux.c
index 9f5fd722f27f1d3877be8927be30409cd74ab3c3..a61c755c3c87e80036a5173115e955bfe7d5a80c 100644
--- a/tools/testing/shared/linux.c
+++ b/tools/testing/shared/linux.c
@@ -181,6 +181,12 @@ int kmem_cache_alloc_bulk(struct kmem_cache *cachep, gfp_t gfp, size_t size,
if (kmalloc_verbose)
pr_debug("Bulk alloc %lu\n", size);
+ if (cachep->exec_callback) {
+ if (cachep->callback)
+ cachep->callback(cachep->private);
+ cachep->exec_callback = false;
+ }
+
pthread_mutex_lock(&cachep->lock);
if (cachep->nr_objs >= size) {
struct radix_tree_node *node;
@@ -270,6 +276,84 @@ __kmem_cache_create_args(const char *name, unsigned int size,
return ret;
}
+struct slab_sheaf *
+kmem_cache_prefill_sheaf(struct kmem_cache *s, gfp_t gfp, unsigned int size)
+{
+ struct slab_sheaf *sheaf;
+ unsigned int capacity;
+
+ if (size > s->sheaf_capacity)
+ capacity = size;
+ else
+ capacity = s->sheaf_capacity;
+
+ sheaf = malloc(sizeof(*sheaf) + sizeof(void *) * s->sheaf_capacity * capacity);
+ if (!sheaf) {
+ return NULL;
+ }
+
+ memset(sheaf, 0, size);
+ sheaf->cache = s;
+ sheaf->capacity = capacity;
+ sheaf->size = kmem_cache_alloc_bulk(s, gfp, size, sheaf->objects);
+ if (!sheaf->size) {
+ free(sheaf);
+ return NULL;
+ }
+
+ return sheaf;
+}
+
+int kmem_cache_refill_sheaf(struct kmem_cache *s, gfp_t gfp,
+ struct slab_sheaf **sheafp, unsigned int size)
+{
+ struct slab_sheaf *sheaf = *sheafp;
+ int refill;
+
+ if (sheaf->size >= size)
+ return 0;
+
+ if (size > sheaf->capacity) {
+ sheaf = kmem_cache_prefill_sheaf(s, gfp, size);
+ if (!sheaf)
+ return -ENOMEM;
+
+ kmem_cache_return_sheaf(s, gfp, *sheafp);
+ *sheafp = sheaf;
+ return 0;
+ }
+
+ refill = kmem_cache_alloc_bulk(s, gfp, size - sheaf->size,
+ &sheaf->objects[sheaf->size]);
+ if (!refill)
+ return -ENOMEM;
+
+ sheaf->size += refill;
+ return 0;
+}
+
+void kmem_cache_return_sheaf(struct kmem_cache *s, gfp_t gfp,
+ struct slab_sheaf *sheaf)
+{
+ if (sheaf->size) {
+ //s->non_kernel += sheaf->size;
+ kmem_cache_free_bulk(s, sheaf->size, &sheaf->objects[0]);
+ }
+ free(sheaf);
+}
+
+void *
+kmem_cache_alloc_from_sheaf(struct kmem_cache *s, gfp_t gfp,
+ struct slab_sheaf *sheaf)
+{
+ if (sheaf->size == 0) {
+ printf("Nothing left in sheaf!\n");
+ return NULL;
+ }
+
+ return sheaf->objects[--sheaf->size];
+}
+
/*
* Test the test infrastructure for kem_cache_alloc/free and bulk counterparts.
*/
--
2.48.1
