Re: [RFC PATCH 09/18] kthread: Make it easier to correctly sleep in iterant kthreads

On Mon, Jun 08, 2015 at 01:48:10PM -0400, Steven Rostedt wrote:

quoted

commit 80ed87c8a9ca0cad7ca66cf3bbdfb17559a66dcf
Author: Peter Zijlstra [off-list ref]
Date:   Fri May 8 14:23:45 2015 +0200

    sched/wait: Introduce TASK_NOLOAD and TASK_IDLE
    
    Currently people use TASK_INTERRUPTIBLE to idle kthreads and wait for
    'work' because TASK_UNINTERRUPTIBLE contributes to the loadavg. Having
    all idle kthreads contribute to the loadavg is somewhat silly.

Not to mention, tasks in TASK_UNINTERRUPTIBLE state for too long will
trigger hung task detection.

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.