linux-kernel - Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount

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Message-ID: <5227892B.7030906@hp.com>
Date:	Wed, 04 Sep 2013 15:25:31 -0400
From:	Waiman Long <waiman.long@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeff Layton <jlayton@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount

On 09/04/2013 11:14 AM, Linus Torvalds wrote:
> On Wed, Sep 4, 2013 at 7:52 AM, Waiman Long<waiman.long@...com>  wrote:
>> The latest tty patches did work. The tty related spinlock contention is now
>> completely gone. The short workload can now reach over 8M JPM which is the
>> highest I have ever seen.
> Good. And this was with the 80-core machine, so there aren't any
> scalability issues hiding?
>
>               Linus

Yes, the perf profile was taking from an 80-core machine. There isn't 
any scalability issue hiding for the short workload on an 80-core machine.

However, I am certain that more may pop up when running in an even 
larger machine like the prototype 240-core machine that our team has 
been testing on.

-Longman
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