On Mon, Aug 21, 2017 at 03:55:53PM +0530, Imran Khan wrote: > khungtask by default monitors either all tasks or no tasks at all > for long unterruptible sleeps. > For Android like environments this arrangement is not optimal because > on one hand it may be permissible to have some background(bg) task > in uninterruptible sleep state for long duration while on the other > hand it may not be permissible to have some foreground(fg) task like > surfaceflinger in uninterruptible sleep state for long duration. How are you getting tasks in UNINTERRUPTIBLE state for a long time to begin with? That's not a good thing, background or not. > So it would be good to have some arrangement so that few specified tasks > can be monitored by khungtaskd, on a need basis. > This change introduces a sysctl option, /proc/sys/kernel/ > hung_task_check_selected, to enable monitoring of selected tasks using > khungtask daemon. If this sysctl option is enabled then only the tasks > specified in /proc/hung_task_monitor_list are monitored otherwise all > tasks are monitored, just like the default case. That's horrible. Why not a file in /proc/$PID/ that excludes it from things?
