Re: Reduce contention on fstrans_lock

[Jason Thorpe <thorpej%me.com@localhost>]

> On Apr 4, 2020, at 2:14 PM, Andrew Doran <ad%netbsd.org@localhost> wrote:
> 
> Any comments?

+static int
+fstrans_lwp_ctor(void *arg, void *obj, int flags)
+{
+	struct fstrans_lwp_info *fli = obj;
+
+	memset(fli, 0, sizeof(*fli));
+	membar_sync();
+	mutex_enter(&fstrans_lock);
+	LIST_INSERT_HEAD(&fstrans_fli_head, fli, fli_list);
+	mutex_exit(&fstrans_lock);
+	return 0;
+}

That membar_sync() could be a membar_producer().

-- thorpej