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Subject: Re: [PATCH V3] rtmutex: ensure only the top waiter or higher
 priority task can take the lock and remove unrelated boosting
From: Steven Rostedt <rostedt@goodmis.org>
To: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dave Young <hidave.darkstar@gmail.com>,
        Darren Hart <dvhart@linux.intel.com>,
        Namhyung Kim <namhyung@gmail.com>, LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>
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Date: Wed, 12 Jan 2011 12:04:24 -0500
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On Wed, 2011-01-12 at 12:03 -0500, Steven Rostedt wrote:
> On Thu, 2010-12-23 at 16:49 +0800, Lai Jiangshan wrote:
> > In current rtmutex, the pending owner may be boosted by the tasks
> > in the rtmutex's waitlist when the pending owner is deboosted
> > or a task in the waitlist is boosted. This boosting is unrelated,
> > because the pending owner does not really take the rtmutex.
> > It is not reasonable.
> 
> Hi Lai,
> 
> Your patch looks like it is proving itself in -rt (after I fixed a bunch
> of -rt stuff to get your stuff working ;).
> 
> Could you repost your patch with the following removed:

Oh, and you can add:

Acked-by: Steven Rostedt <rostedt@goodmis.org>

Thanks!

-- Steve