On Mon, Jun 11, 2018 at 2:48 PM, Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp> wrote: > On 2018/06/11 20:16, Dmitry Vyukov wrote: >>> timeout = 60 and period = 1 would allow hung task to be reported as soon >>> as it remained uninterruptible for 60 seconds. That makes me easier to >>> narrow down relevant kernel messages and syzbot program. >>> >>> Well, showing exact slept time, along with all threads which slept more >>> than some threshold (e.g. timeout / 2), might be helpful. >> >> You mean if we report any task, then scan all tasks second time and >> additionally report tasks that are blocked for (timeout/2 : timeout)? > > Yes. Something like check_memalloc_stalling_tasks() in > http://lkml.kernel.org/r/1495331504-12480-1-git-send-email-penguin-ker...@i-love.sakura.ne.jp > . > >> >> Should we do this when hung_task_show_lock? Or only when >> sysctl_hung_task_panic? Or when? >> > > I think always is more useful. That is, first round only checks whether > there is at least one stalling task, and second round reports stalling tasks > if at least one task is stalling.
Agree that it would be useful. But can't promise to work on this soon.
