linux-kernel - Re: [PATCH 1/4] locking/ww_mutex: Fix a deadlock affecting ww

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Message-ID: <20161123143200.GV3092@twins.programming.kicks-ass.net>
Date:   Wed, 23 Nov 2016 15:32:00 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nicolai Hähnle <nhaehnle@...il.com>,
        Nicolai Hähnle <Nicolai.Haehnle@....com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Ingo Molnar <mingo@...hat.com>, stable@...r.kernel.org,
        Maarten Lankhorst <maarten.lankhorst@...onical.com>
Subject: Re: [PATCH 1/4] locking/ww_mutex: Fix a deadlock affecting ww_mutexes

On Wed, Nov 23, 2016 at 03:25:25PM +0100, Daniel Vetter wrote:

> Without thinking it through in detail this is a PI issue, except that we
> replace boosting with wakeup&back-off. Could we perhaps steal something
> from rt mutexes to make it fair&efficient?

rt_mutexes order the waiters by 'priority' and wake the top most.