Date: Fri, 9 Jun 2017 09:20:36 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>,
        "Reshetova, Elena" <elena.reshetova@intel.com>,
        Christoph Hellwig <hch@infradead.org>,
        Kees Cook <keescook@chromium.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>, Jann Horn <jannh@google.com>,
        Eric Biggers <ebiggers3@gmail.com>,
        Hans Liljestrand <ishkamiel@gmail.com>,
        David Windsor <dwindsor@gmail.com>,
        Greg KH <gregkh@linuxfoundation.org>, Ingo Molnar <mingo@redhat.com>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        "Serge E. Hallyn" <serge@hallyn.com>,
        "arozansk@redhat.com" <arozansk@redhat.com>,
        "axboe@kernel.dk" <axboe@kernel.dk>,
        James Bottomley <James.Bottomley@hansenpartnership.com>,
        "x86@kernel.org" <x86@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, "David S. Miller" <davem@davemloft.net>,
        Rik van Riel <riel@redhat.com>,
        linux-arch <linux-arch@vger.kernel.org>
Subject: Re: [PATCH v2] refcount: Create unchecked atomic_t implementation
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On Fri, Jun 09, 2017 at 06:24:04AM +0200, Manfred Spraul wrote:
> Hi Davidlohr,
> 
> On 06/08/2017 10:09 PM, Davidlohr Bueso wrote:
> >
> >Yes, this would be a prerequisite for ipc; which I initially thought
> >didn't
> >take a performance hit.
> >
> Did you see a regression for ipc?

I'd be most interested in having a benchmark that shows a regression.
Please share.