Commit 6bc6e6b2 authored Jan 31, 2023 by Paul E. McKenney Committed by Boqun Feng Mar 20, 2023

refscale: Move shutdown from wait_event() to wait_event_idle()



The ref_scale_shutdown() kthread/function uses wait_event() to wait for
the refscale test to complete.  However, although the read-side tests
are normally extremely fast, there is no law against specifying a very
large value for the refscale.loops module parameter or against having
a slow read-side primitive.  Either way, this might well trigger the
hung-task timeout.

This commit therefore replaces those wait_event() calls with calls to
wait_event_idle(), which do not trigger the hung-task timeout.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>

parent ef1ef3d4

kernel/rcu/refscale.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1031,7 +1031,7 @@ ref_scale_cleanup(void)
		static int
		ref_scale_shutdown(void *arg)
		{
		wait_event(shutdown_wq, shutdown_start);
		wait_event_idle(shutdown_wq, shutdown_start);

		smp_mb(); // Wake before output.
		ref_scale_cleanup();