Re: [PATCH 2/2] kernel: rerun task_work while freezing in get_signal()

[Oleg Nesterov]

On 07/10, Pavel Begunkov wrote:
>
> On 7/10/24 01:54, Tejun Heo wrote:
> >Yeah, the question is: If CRIU is to use cgroup freezer to freeze the tasks
> >and then go around tracing each to make dump, would the freezer be enough in
> >avoiding interim state changes? Using CRIU implementation is a bit arbitrary
> >but I think checkpoint-restart is a useful bar to measure what should stay
> >stable while a cgroup is frozen.
>
> Sounds like in the long run we might want to ignore task_work while
> it's frozen,

Just in case, this is what I have in mind right now, but I am still not sure
and can't make a "clean" patch.

If nothing else. CRIU needs to attach and make this task TASK_TRACED, right?
And once the target task is traced, it won't react to task_work_add(TWA_SIGNAL).

Oleg.