linux-kernel - Re: [PATCH] rwsem: Comments to explain the meaning of the rwsem's count field

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Message-ID: <1398969532.4884.1.camel@buesod1.americas.hpqcorp.net>
Date:	Thu, 01 May 2014 11:38:52 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Shi <alex.shi@...aro.org>,
	Andi Kleen <andi@...stfloor.org>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Paul E.McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jason Low <jason.low2@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rwsem: Comments to explain the meaning of the rwsem's
 count field

On Thu, 2014-05-01 at 10:50 -0700, Tim Chen wrote:
> It takes me a while to understand how rwsem's count field mainifest
> itself in different scenarios.  I'm adding comments to provide a quick
> reference on the the rwsem's count field for each scenario where readers
> and writers are contending/holding the lock.  Hopefully it will be useful
> for future maintenance of the code and for people to get up to speed on
> how the logic in the code works.

Agreed, this is nice to have. I'm planning on sending a minor set of
patches for rwsem once the optistic spinning stuff is taken. To simplify
things, I can take this in the series and resend along with the others.

Thanks,
Davidlohr

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