linux-kernel - Re: [PATCH RFC ticketlock] Auto-queued ticketlock

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Message-ID: <1371259580.21896.18.camel@pasglop>
Date:	Sat, 15 Jun 2013 11:26:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Waiman Long <waiman.long@...com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, ????????? <laijs@...fujitsu.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Triplett <josh@...htriplett.org>, niv@...ibm.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	David Howells <dhowells@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Darren Hart <darren@...art.com>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Silas Boyd-Wickizer <sbw@....edu>
Subject: Re: [PATCH RFC ticketlock] Auto-queued ticketlock

On Fri, 2013-06-14 at 14:17 -0400, Waiman Long wrote:
> 
> With some minor changes, the current patch can be modified to support 
> debugging lock for 32-bit system. For 64-bit system, we can apply a 
> similar concept for debugging lock with cmpxchg_double. However, for 
> architecture that does not have cmpxchg_double support, it will be out 
> of luck and we probably couldn't support the same feature in debugging 
> mode. It will have to fall back to taking the lock.

That means only x86_64 and s390 would benefit from it ... I'm sure we can do better :-)

Cheers,
Ben.


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