linux-kernel - Re: [RFC PATCH v2 3/5] futex: Throughput-optimized (TO) futexes

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Message-ID: <alpine.DEB.2.20.1609222339180.5640@nanos>
Date:   Thu, 22 Sep 2016 23:41:30 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Davidlohr Bueso <dave@...olabs.net>
cc:     Waiman Long <waiman.long@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mike Galbraith <umgwanakikbuti@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, Jason Low <jason.low2@....com>,
        Scott J Norton <scott.norton@....com>,
        Douglas Hatch <doug.hatch@....com>
Subject: Re: [RFC PATCH v2 3/5] futex: Throughput-optimized (TO) futexes

On Thu, 22 Sep 2016, Davidlohr Bueso wrote:
> On Thu, 22 Sep 2016, Waiman Long wrote:
> 
> > BTW, my initial attempt for the new futex was to use the same workflow as
> > the PI futexes, but use mutex which has optimistic spinning instead of
> > rt_mutex.
> 
> Btw, Thomas, do you still have any interest pursuing this for rtmutexes from
> -rt into mainline? If so I can resend the patches from a while ago.

Certainly yes. My faint memory tells me that there was some potential issue
due to boosting the owner only if it gets scheduled out, but I might be
wrong.

Thanks,

	tglx