linux-kernel - Re: [RFC] Cancellable MCS spinlock rework

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Message-ID: <20140703073107.GS19379@twins.programming.kicks-ass.net>
Date:	Thu, 3 Jul 2014 09:31:07 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Low <jason.low2@...com>
Cc:	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	mingo@...nel.org, Waiman.Long@...com, davidlohr@...com,
	linux-kernel@...r.kernel.org, riel@...hat.com,
	akpm@...ux-foundation.org, hpa@...or.com, andi@...stfloor.org,
	James.Bottomley@...senpartnership.com, rostedt@...dmis.org,
	tim.c.chen@...ux.intel.com, aswin@...com, scott.norton@...com,
	chegu_vinod@...com
Subject: Re: [RFC] Cancellable MCS spinlock rework

On Wed, Jul 02, 2014 at 10:30:03AM -0700, Jason Low wrote:
> Would potentially reducing the size of the rw semaphore structure by 32
> bits (for all architectures using optimistic spinning) be a nice
> benefit?

Possibly, although I had a look at the mutex structure and we didn't
have a hole to place it in, unlike what you found with the rwsem.

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