linux-kernel - Re: Filesystem lockup with CONFIG_PREEMPT

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Message-ID: <alpine.DEB.2.10.1407052226300.22031@nanos>
Date:	Sat, 5 Jul 2014 22:26:54 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Austin Schuh <austin@...oton-tech.com>
cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Filesystem lockup with CONFIG_PREEMPT_RT

On Mon, 30 Jun 2014, Austin Schuh wrote:
> I think I might have an answer for my own question, but I would
> appreciate someone else to double check.  If list_empty erroneously
> returns that there is work to do when there isn't work to do, we wake
> up an extra worker which then goes back to sleep.  Not a big loss.  If
> list_empty erroneously returns that there isn't work to do when there
> is, this should only be because someone is modifying the work list.
> When they finish, as far as I can tell, all callers then check to see
> if a worker needs to be started up, and start one.

Precisely.
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