On 2019/06/20 19:10, Yafang Shao wrote: >>> With this patch, hung task warnings will be reset with >>> sys_hung_task_warnings setting in evenry check interval. >> >> Since it is uncommon that the messages are printed for more than 10 >> times for one check_hung_uninterruptible_tasks() call, this patch is >> effectively changing to always print the messages (in other words, >> setting -1). > > If sys_hung_task_warnings can't be recovered, does it make sense to exist? > In which case do we need this setting ?
Someone might want to print the messages up to only a few times because he/she does not like the ever-repeating messages. But automatically resetting will forbid his/her wish to print the messages for up to only a few times. > > Btw, why the default value of this setting is 10, instead of -1 ? I don't know. I guess just by historical reason, for this variable has been existed before support of -1 is added.
