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

On 08/11, Zihuan Zhang wrote:

在 2025/8/8 22:39, Oleg Nesterov 写道:

quoted

On 08/07, Zihuan Zhang wrote:

quoted

--- 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.