On Wed, 10 Jun 2015, Steven Rostedt wrote: > > Right, and I had not considered that, but it turns out the hung_task > > detector checks p->state == TASK_UNINTERRUPTIBLE, so TASK_IDLE is indeed > > safe from that. > > Also, I would assume that TASK_IDLE only makes sense for kernel > threads, I wonder if we should add an assertion in schedule that > triggers if a task is scheduling with TASK_IDLE and is not a kernel > thread (has its own mm?)
For the sake of completnes -- testing for !task_struct->mm is not a correct test to find out whether given entity is a kernel thread; kernel threads are free to temporarily adopt user struct mm via use_mm() (usually for handling AIO on behalf of a particular struct mm). The correct check is to look at PF_KTHREAD flag in task_struct->flags. -- Jiri Kosina SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
