linux-kernel - Re: [PATCH V3] rtmutex: ensure only the top waiter or higher priority task can take the lock and remove unrelated boosting

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Date:	Wed, 12 Jan 2011 12:04:24 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Young <hidave.darkstar@...il.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH V3] rtmutex: ensure only the top waiter or higher
 priority task can take the lock and remove unrelated boosting

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@...dmis.org>

Thanks!

-- Steve


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