linux-kernel - Re: [PATCH v2 2/3] rtmutex: update rt-mutex

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Message-ID: <e98b7dd7-049e-a2fc-d7b2-e8c59e5f3d3e@linaro.org>
Date:   Tue, 20 Jun 2017 08:24:31 +0800
From:   Alex Shi <alex.shi@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        "open list:LOCKING PRIMITIVES" <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Juri Lelli <juri.lelli@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 2/3] rtmutex: update rt-mutex

Any more comments or concern on this?

Thanks!

On 05/25/2017 01:26 PM, Alex Shi wrote:
> The rtmutex remove a pending owner bit in in rt_mutex::owner, in
> commit 8161239a8bcc ("rtmutex: Simplify PI algorithm and make highest prio task get lock")
> But the document was changed accordingly. Updating it to a meaningful
> state.
> 
> BTW, as 'Steven Rostedt' mentioned:
> There is still technically a "Pending Owner", it's just not called
> that anymore. The pending owner happens to be the top_waiter of a lock
> that has no owner and has been woken up to grab the lock.
> 
> Signed-off-by: Alex Shi <alex.shi@...aro.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Sebastian Siewior <bigeasy@...utronix.de>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Juri Lelli <juri.lelli@....com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> To: linux-doc@...r.kernel.org
> To: linux-kernel@...r.kernel.org
> To: Jonathan Corbet <corbet@....net>
> To: Ingo Molnar <mingo@...hat.com>
> To: Peter Zijlstra <peterz@...radead.org>
> ---
>  Documentation/locking/rt-mutex.txt | 58 +++++++++++++++++---------------------
>  1 file changed, 26 insertions(+), 32 deletions(-)