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Date:	Thu, 20 Mar 2014 19:49:04 +0100
From:	Oleg Nesterov <>
To:	Peter Zijlstra <>
Cc:	"Dilger, Andreas" <>,
	Peng Tao <>,
	Linux Kernel Mailing List <>,
	Ingo Molnar <>,
	"Drokin, Oleg" <>
Subject: Re: [PATCH RFC] sched: introduce add_wait_queue_exclusive_head

On 03/19, Peter Zijlstra wrote:
> On Wed, Mar 19, 2014 at 07:44:29PM +0000, Dilger, Andreas wrote:
> > The original reason for l_wait_event() not using TASK_UNINTERRUPTIBLE
> > is to avoid the load on the server continually being "num_service_threads"
> > regardless of whether they are actually doing something or not.  We
> > added various cases for periodic wakeups and such afterward.
> Hmm, maybe we should finally do the TASK_IDLE thing;

Agreed. And if we are not going to expose TASK_IDLE bit in /proc/ (I think
we should not) the patch should be really trivial.


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