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Date: Fri, 30 Aug 2013 12:12:27 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: sedat.dilek@gmail.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Waiman Long <waiman.long@hp.com>, Ingo Molnar <mingo@kernel.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jeff Layton <jlayton@redhat.com>, Miklos Szeredi <mszeredi@suse.cz>,
        Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Andi Kleen <andi@firstfloor.org>,
        "Chandramouleeswaran, Aswin" <aswin@hp.com>,
        "Norton, Scott J" <scott.norton@hp.com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount
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On Fri, 30 Aug 2013 17:38:47 +0200
Sedat Dilek <sedat.dilek@gmail.com> wrote:


> A Samsung series-5 ultrabook.
> 
> $ grep "model name" /proc/cpuinfo | uniq
> model name      : Intel(R) Core(TM) i5-2467M CPU @ 1.60GHz

I believe the number of CPUs is more important. But as this is an
ultrabook, I doubt that is very high.

Now I know this isn't going to be popular, but I'll suggest it anyway.
What about only implementing the lockref locking when CPUs are greater
than 7, 7 or less will still use the normal optimized spinlocks.

-- Steve
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