Accurately report VM memsize

Currently the calculation only counts the size of the struct. This commit adds the size of the associated st tables, id tables, and linked lists.

Still missing is the size of the ractors and (potentially) the size of the object space.

1 files changed, 15 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 95daed6668..46ae21b589 100644
--- a/thread.c
+++ b/thread.c
@@ -5575,6 +5575,21 @@ rb_check_deadlock(rb_ractor_t *r)
     }
 }
 
+// Used for VM memsize reporting. Returns the size of a list of waiting_fd
+// structs. Defined here because the struct definition lives here as well.
+size_t
+rb_vm_memsize_waiting_fds(struct list_head *waiting_fds)
+{
+    struct waiting_fd *waitfd = 0;
+    size_t size = 0;
+
+    list_for_each(waiting_fds, waitfd, wfd_node) {
+        size += sizeof(struct waiting_fd);
+    }
+
+    return size;
+}
+
 static void
 update_line_coverage(VALUE data, const rb_trace_arg_t *trace_arg)
 {