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

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Message-ID: <20150610100729.6a674c15@gandalf.local.home>
Date:	Wed, 10 Jun 2015 10:07:29 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Petr Mladek <pmladek@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	linux-nfs@...r.kernel.org, Chris Mason <clm@...com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Borislav Petkov <bp@...e.de>,
	Michal Hocko <mhocko@...e.cz>, live-patching@...r.kernel.org,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 09/18] kthread: Make it easier to correctly sleep in
 iterant kthreads

On Wed, 10 Jun 2015 11:07:24 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> > 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.

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?)

-- Steve
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