Add a debug function to dump heap usage

kernel/src/memory/Heap.cpp

@@ -329,3 +329,35 @@ Result<void*> kcalloc(usize nmemb, usize size)
     void* ptr = TRY(kmalloc(realsize));
     return memset(ptr, 0, realsize);
 }
+
+void dump_heap_usage()
+{
+    Serial::println("-- Dumping usage stats for kernel heap:");
+    if (!heap_start)
+    {
+        Serial::println("- Heap is not currently being used");
+        return;
+    }
+    usize alloc_total = 0;
+    usize alloc_used = 0;
+    HeapBlock* block = heap_start;
+    while (block)
+    {
+        if (is_block_free(block))
+        {
+            Serial::printf("- Available block, of size %zu\n", block->full_size);
+            alloc_total += block->full_size + sizeof(HeapBlock);
+        }
+        else
+        {
+            Serial::printf("- Used block, of size %zu, of which %zu bytes are being used\n", block->full_size,
+                           block->req_size);
+            alloc_total += block->full_size + sizeof(HeapBlock);
+            alloc_used += block->req_size;
+        }
+        block = block->next;
+    }
+
+    Serial::printf("-- Total memory allocated for heap: %zu bytes\n", alloc_total);
+    Serial::printf("-- Heap memory in use by the kernel: %zu bytes\n", alloc_used);
+}

kernel/src/memory/Heap.h

@@ -18,3 +18,5 @@ template <typename T> Result<void> destroy(T* item)
     item->~T();
     return kfree(item);
 }
+
+void dump_heap_usage();