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From: Davidlohr Bueso <dave@stgolabs.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>, Ingo Molnar <mingo@redhat.com>,
	Will Deacon <will.deacon@arm.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] locking/rwsem: Make owner store task pointer of last owning reader
Date: Tue, 11 Sep 2018 12:21:22 -0700	[thread overview]
Message-ID: <20180911192122.GD3902@linux-r8p5> (raw)
In-Reply-To: <20180910093156.GS24082@hirez.programming.kicks-ass.net>

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

  parent reply	other threads:[~2018-09-11 19:21 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-06 20:18 [PATCH] locking/rwsem: Make owner store task pointer of last owning reader Waiman Long
2018-09-10  9:31 ` Peter Zijlstra
2018-09-10 15:01   ` Waiman Long
2018-09-10 17:15     ` Davidlohr Bueso
2018-09-10 17:35       ` Waiman Long
2018-09-11  8:17       ` Peter Zijlstra
2018-09-11 12:56         ` Waiman Long
2018-09-11 19:21   ` Davidlohr Bueso [this message]
2018-09-11 19:38     ` Peter Zijlstra
2018-09-10 10:54 ` [tip:locking/core] " tip-bot for Waiman Long

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