man/io_uring_register.2: document IORING_REGISTER_IOWQ_MAX_UNBOUND
@@ -311,9 +311,33 @@ Available since 5.14.
.B IORING_UNREGISTER_IOWQ_AFF
Undoes a CPU mask previously set with
.B IORING_REGISTER_IOWQ_AFF
+Must not have
+.I arg
+or
+.I nr_args
+set.
Available since 5.14.
+.TP
+.B IORING_REGISTER_IOWQ_MAX_UNBOUND
+By default, io_uring limits the unbounded workers created to the maximum
+processor count set by
+.I RLIMIT_NPROC.
+Sometimes this can be excessive, and this command provides a way to limit
+the count per ring (per NUMA node) instead.
+.I arg
+must be set to an
+.I unsigned int
+pointer, with the value in the variable being set to the maximum count of
+unbounded workers per NUMA node. If the count being passed in is 0, then
+this command returns the current maximum values. If any other values is set,
+this command returns either the old value, or -1 and
+.I errno
+set appropriately.
+.I nr_args
+must be set to 1, as the command only takes one argument.
+
.SH RETURN VALUE
On success,
