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Date: Wed, 19 Mar 2014 20:55:20 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: "Dilger, Andreas" <andreas.dilger@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>, Peng Tao <bergwolf@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>, "Drokin, Oleg" <oleg.drokin@intel.com>
Subject: Re: [PATCH RFC] sched: introduce add_wait_queue_exclusive_head
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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;

  https://lkml.org/lkml/2013/11/12/710

Oleg?