On Tuesday, August 20, 2013 01:20:03 PM Bartlomiej Zolnierkiewicz wrote:
> Change __refrigerator() to allow SIGKILL signal handling during
> the frozen state (by setting task to a TASK_KILLABLE state instead
> of TASK_UNINTERRUPTIBLE one before entering sleep) and make tasks
> leave __refrigerator() upon receiving such signal.
>
> These changes allow frozen tasks to be killed immediately without
> the need to thaw them first.
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
> Signed-off-by: Kyungmin Park <[email protected]>
Well, it doesn't sound like an entirely bad idea to me, but I'd like to know
what Colin and Tejun (CCed now) think about it.
Thanks,
Rafael
> ---
> kernel/freezer.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/freezer.c b/kernel/freezer.c
> index b462fa1..0c05a7a 100644
> --- a/kernel/freezer.c
> +++ b/kernel/freezer.c
> @@ -57,12 +57,13 @@ bool __refrigerator(bool check_kthr_stop)
> pr_debug("%s entered refrigerator\n", current->comm);
>
> for (;;) {
> - set_current_state(TASK_UNINTERRUPTIBLE);
> + set_current_state(TASK_KILLABLE);
>
> spin_lock_irq(&freezer_lock);
> current->flags |= PF_FROZEN;
> if (!freezing(current) ||
> - (check_kthr_stop && kthread_should_stop()))
> + (check_kthr_stop && kthread_should_stop()) ||
> + fatal_signal_pending(current))
> current->flags &= ~PF_FROZEN;
> spin_unlock_irq(&freezer_lock);
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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