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Date: Wed, 10 Jun 2015 11:07:24 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Steven Rostedt <rostedt@...dmis.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 Mon, Jun 08, 2015 at 01:48:10PM -0400, Steven Rostedt wrote: > > commit 80ed87c8a9ca0cad7ca66cf3bbdfb17559a66dcf > > Author: Peter Zijlstra <peterz@...radead.org> > > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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