linux-kernel - Re: [PATCH] locking/rwsem: Make owner store task pointer of last owning reader

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Message-ID: <20180911192122.GD3902@linux-r8p5>
Date:   Tue, 11 Sep 2018 12:21:22 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Waiman Long <longman@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] locking/rwsem: Make owner store task pointer of last
 owning reader

On Mon, 10 Sep 2018, Peter Zijlstra wrote:

>[ RT has something along those lines, and I have half a patch that
>  starts doing that too, but I never found enough time to really work on
>  it :-( ]

But don't rt rwsems act pretty much like a regular mutex in that it only
allows readers to nest, not share the lock because of priority inversion
scenarios.

Also, wrt rtmutex, will that top-spinner thing ever make it in?

Thanks,
Davidlohr