linux-kernel - Re: Filesystem lockup with CONFIG_PREEMPT

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Date:	Sat, 28 Jun 2014 09:11:18 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Austin Schuh <austin@...oton-tech.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	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>
Subject: Re: Filesystem lockup with CONFIG_PREEMPT_RT

On Fri, 2014-06-27 at 23:20 -0700, Austin Schuh wrote:

> For workqueues, as long as the helper doesn't block on a lock which
> requires the work queue to be freed up, it will eventually become
> unblocked and make progress.  The helper _should_ only need the pool
> lock, which will wake the helper back up when it is available again.
> Nothing should go to sleep in an un-recoverable way with the work pool
> lock held.

Well, Thomas killed taking a lock from within the core of a lock, so
that wart shrank back to microscopic.  Applying that same ointment to
the plug puller gizmo and schedule_work() would be most excellent.

-Mike

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