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Date: Fri, 30 Aug 2013 18:16:22 +0200
Message-ID: <CA+icZUX--Yo6TMGiL5ipeQmD67Psn0LuYfT5vQw-0_hjyp6o-g@mail.gmail.com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount
From: Sedat Dilek <sedat.dilek@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
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>
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On Fri, Aug 30, 2013 at 6:12 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
> 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.
>

Fantastic Four.

> 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.
>

I have seen that spinlock-lockref stuff is more important on that
monster-machines.
It's good to see it does not break "smaller" systems.

- Sedat -
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