From: David Chinner <dgc@sgi.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Daniel Walker <dwalker@mvista.com>, Ingo Molnar <mingo@elte.hu>,
Remy Bohmer <linux@bohmer.net>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>,
RT <linux-rt-users@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Dave Chinner <dgc@sgi.com>
Subject: Re: [BUG on PREEMPT_RT, 2.6.23.1-rt5] in rt-mutex code and signals
Date: Mon, 19 Nov 2007 09:26:20 +1100 [thread overview]
Message-ID: <20071118222620.GN66820511@sgi.com> (raw)
In-Reply-To: <1195389230.6747.5.camel@twins>
On Sun, Nov 18, 2007 at 01:33:50PM +0100, Peter Zijlstra wrote:
>
> On Sat, 2007-11-17 at 10:12 -0800, Daniel Walker wrote:
>
> > What specifically is wrong with dev->sem ?
>
> Nothing really, other than that they use semaphores to avoid lockdep :-/
>
> I think I know how to annotate this, after Alan Stern explained all the
> use cases, but I haven't come around to implementing it. Hope to do that
> soonish.
>
> Another real semaphore user is XFS, they really use the down/up
> asymmetry that semaphores allow, last time I spoke with Dave Chinner he
> didn't know a way around this.
Hasn't changed recently. We could convert some to completions, but
others are much more difficult.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
next prev parent reply other threads:[~2007-11-18 22:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-16 15:51 [BUG on PREEMPT_RT, 2.6.23.1-rt5] in rt-mutex code and signals Remy Bohmer
2007-11-16 20:20 ` Steven Rostedt
2007-11-16 23:02 ` Remy Bohmer
2007-11-16 23:37 ` Steven Rostedt
2007-11-17 11:44 ` Remy Bohmer
2007-11-17 14:08 ` Steven Rostedt
2007-11-17 15:06 ` Steven Rostedt
2007-11-17 15:36 ` Remy Bohmer
2007-11-19 12:55 ` Remy Bohmer
2007-11-19 13:54 ` Steven Rostedt
2007-11-17 16:22 ` Daniel Walker
2007-11-17 17:09 ` Remy Bohmer
2007-11-17 17:29 ` Daniel Walker
2007-11-17 17:46 ` Ingo Molnar
2007-11-17 17:55 ` Daniel Walker
2007-11-17 18:04 ` Ingo Molnar
2007-11-17 18:12 ` Daniel Walker
2007-11-18 12:33 ` Peter Zijlstra
2007-11-18 22:26 ` David Chinner [this message]
2007-11-17 22:49 ` Remy Bohmer
2007-11-19 7:24 ` Jon Masters
2007-11-19 7:25 ` Jon Masters
2007-11-19 15:31 ` Daniel Walker
2007-11-19 15:51 ` Remy Bohmer
2007-11-19 16:11 ` Daniel Walker
2007-11-20 16:43 ` Daniel Walker
2007-11-20 20:37 ` Ingo Molnar
2007-11-20 20:54 ` Daniel Walker
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