Re: [RFC PATCH v1 5/9] freezer: set default freeze priority for PF_SUSPEND_TASK processes

[Oleg Nesterov]

On 08/11, Zihuan Zhang wrote:
> 
> 在 2025/8/8 22:39, Oleg Nesterov 写道:
> >On 08/07, Zihuan Zhang wrote:
> >>--- a/kernel/power/process.c
> >>+++ b/kernel/power/process.c
> >>@@ -147,6 +147,7 @@ int freeze_processes(void)
> >>
> >>  	pm_wakeup_clear(0);
> >>  	pm_freezing = true;
> >>+	freeze_set_default_priority(current, FREEZE_PRIORITY_NEVER);
> >But why?
> >
> >Again, freeze_task() will return false anyway, this process is
> >PF_SUSPEND_TASK.
>
> I  think there is resaon put it here. For example, systemd-sleep is a
> user-space process that executes the suspend flow.
>
>  If we don’t set its freeze priority explicitly, our current code may end up
> with this user process being the last one that cannot freeze.

How so? sorry I don't follow.

Oleg.