linux-kernel - Re: [PATCH 11/12] rwsem: wake all readers when first waiter is a reader

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Message-ID: <20130311075018.GA10514@gmail.com>
Date:	Mon, 11 Mar 2013 08:50:18 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Michel Lespinasse <walken@...gle.com>,
	Alex Shi <alex.shi@...el.com>,
	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/12] rwsem: wake all readers when first waiter is a
 reader


* Dave Chinner <david@...morbit.com> wrote:

> So, that's my concern - we've got 20 years of algorithms in XFS designed 
> around rwsem write locks providing read-side barriers, and it's been 
> down this road once before (over 15 years ago). [...]

We are certainly not going to break reader/writer fairness - that's a must 
for any generic, long-held reader-writer locking mechanism.

Thanks,

	Ingo
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