1 files changed, 53 insertions, 0 deletions
diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h
new file mode 100644
index 000000000000..729793ae9712
--- /dev/null
+++ b/io_uring/alloc_cache.h
@@ -0,0 +1,53 @@
+#ifndef IOU_ALLOC_CACHE_H
+#define IOU_ALLOC_CACHE_H
+
+/*
+ * Don't allow the cache to grow beyond this size.
+ */
+#define IO_ALLOC_CACHE_MAX	512
+
+struct io_cache_entry {
+	struct hlist_node	node;
+};
+
+static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
+				      struct io_cache_entry *entry)
+{
+	if (cache->nr_cached < IO_ALLOC_CACHE_MAX) {
+		cache->nr_cached++;
+		hlist_add_head(&entry->node, &cache->list);
+		return true;
+	}
+	return false;
+}
+
+static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache)
+{
+	if (!hlist_empty(&cache->list)) {
+		struct hlist_node *node = cache->list.first;
+
+		hlist_del(node);
+		return container_of(node, struct io_cache_entry, node);
+	}
+
+	return NULL;
+}
+
+static inline void io_alloc_cache_init(struct io_alloc_cache *cache)
+{
+	INIT_HLIST_HEAD(&cache->list);
+	cache->nr_cached = 0;
+}
+
+static inline void io_alloc_cache_free(struct io_alloc_cache *cache,
+					void (*free)(struct io_cache_entry *))
+{
+	while (!hlist_empty(&cache->list)) {
+		struct hlist_node *node = cache->list.first;
+
+		hlist_del(node);
+		free(container_of(node, struct io_cache_entry, node));
+	}
+	cache->nr_cached = 0;
+}
+#endif