| Message ID | 20250619035355.33402-3-zhangzihuan@kylinos.cn |
|---|---|
| State | New |
| Headers | show |
| Series | PM: freezer: Add retry stats and D-state task logging for debugging | expand |
diff --git a/kernel/power/process.c b/kernel/power/process.c index 87616ca710ac..4007f621c2ad 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -55,6 +55,9 @@ static int try_to_freeze_tasks(bool user_only) if (p == current || !freeze_task(p)) continue; + if (retry > 1 && READ_ONCE(p->__state) == TASK_UNINTERRUPTIBLE) + sched_show_task(p); + todo++; } read_unlock(&tasklist_lock);
To help diagnose freezing delays caused by tasks stuck in D-state, this patch adds logging for tasks that are stuck in D-state during each retry of the freezer loop. Such tasks are not killable and cannot be frozen, which can cause the system suspend process to retry many times before aborting. This message can help developers identify which user-space or kernel tasks are blocking the freeze process. Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn> --- kernel/power/process.c | 3 +++ 1 file changed, 3 insertions(+)