On Wed, Apr 17, 2024 at 07:49:17PM +0200, Mikulas Patocka wrote:
> Index: linux-2.6/kernel/sched/completion.c
> ===================================================================
> --- linux-2.6.orig/kernel/sched/completion.c 2024-04-17 19:41:14.000000000 +0200
> +++ linux-2.6/kernel/sched/completion.c 2024-04-17 19:41:14.000000000 +0200
> @@ -290,6 +290,26 @@ wait_for_completion_killable_timeout(str
> EXPORT_SYMBOL(wait_for_completion_killable_timeout);
>
> /**
> + * wait_for_completion_long_io - waits for completion of a task
> + * @x: holds the state of this particular completion
> + *
> + * This is like wait_for_completion_io, but it doesn't warn if the wait takes
> + * too long.
> + */
> +void wait_for_completion_long_io(struct completion *x)
> +{
> + /* Prevent hang_check timer from firing at us during very long I/O */
> + unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2;
> +
> + if (timeout)
> + while (!wait_for_completion_io_timeout(x, timeout))
> + ;
> + else
> + wait_for_completion_io(x);
> +}
> +EXPORT_SYMBOL(wait_for_completion_long_io);
Urgh, why is it a sane thing to circumvent the hang check timer?
