linux-kernel - Re: [RFC][PATCH RT 0/3] RT: Fix trylock deadlock without msleep() hack

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Message-ID: <20150905082723.5bc11a25@gandalf.local.home>
Date:	Sat, 5 Sep 2015 08:27:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Carsten Emde <C.Emde@...dl.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Kacur <jkacur@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clark.williams@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC][PATCH RT 0/3] RT: Fix trylock deadlock without msleep()
 hack

On Sat, 5 Sep 2015 08:18:36 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:


> I even had that solution in my slides at LinuxCon/LinuxPlumbers ;-)

Here's my slides:

http://rostedt.homelinux.com/private/linux-con-rt-into-mainline-2015.pdf

Slide 19 is where I start talking about it.

Slide 21 shows Ingo's solution.

Slide 22 shows the complex issue of dcache.c.

Would your solution work with that code?

-- Steve

> 
> 
> But then I talk about dcache.c. Take a look at that file, and the
> complexity of that. Is it safe to take the inode and dcache parent
> locks after you unlock the other locks?

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