On Wed, Apr 12, 2023 at 09:54:43AM +0800, zhouzhouyi@xxxxxxxxx wrote:
> From: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
>
> In kfree_rcu_test, kfree_scale_shutdown will be detected as hung task
> if kfree_loops is too big. Replace wait_event with wait_event_interruptible
> to avoid false positive.
>
> Tested in the PPC VM of Open Source Lab of Oregon State University.
>
> Signed-off-by: Zhouyi Zhou <zhouzhouyi@xxxxxxxxx>
> ---
> kernel/rcu/rcuscale.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
> index 91fb5905a008..b37eec94957c 100644
> --- a/kernel/rcu/rcuscale.c
> +++ b/kernel/rcu/rcuscale.c
> @@ -771,7 +771,7 @@ kfree_scale_cleanup(void)
> static int
> kfree_scale_shutdown(void *arg)
> {
> - wait_event(shutdown_wq,
> + wait_event_interruptible(shutdown_wq,
Good catch!!!
Would wait_event_idle() work in this case? The _interruptible()
variant indicates that wakeups due to things like POSIX signals is
permitted.
Thanx, Paul
> atomic_read(&n_kfree_scale_thread_ended) >= kfree_nrealthreads);
>
> smp_mb(); /* Wake before output. */
> --
> 2.34.1
>
