linux-kernel - Re: Filesystem lockup with CONFIG_PREEMPT

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Message-ID: <1403839369.20458.12.camel@marge.simpson.net>
Date:	Fri, 27 Jun 2014 05:22:49 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Austin Schuh <austin@...oton-tech.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Richard Weinberger <richard.weinberger@...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 Thu, 2014-06-26 at 17:07 -0700, Austin Schuh wrote:

> If I'm reading the rt patch correctly, wq_worker_sleeping was moved
> out of __schedule to sched_submit_work.  It looks like that changes
> the conditions under which wq_worker_sleeping is called.  It used to
> be called whenever a task was going to sleep (I think).  It looks like
> it is called now if the task is going to sleep, and if the task isn't
> blocked on a PI mutex (I think).

Re-entanglement does turn your killer into a happy camper, but that
patch is too lovely to just surrender without a squabble.

-Mike

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