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Levin" , Keith Busch , linux-mm@kvack.org, Paul Mackerras , Christoph Lameter , Ira Weiny , Dan Williams , Elena Reshetova , linux-arch@vger.kernel.org, Santosh Sivaraj , Davidlohr Bueso , "Aneesh Kumar K.V" , Bartlomiej Zolnierkiewicz , Mike Rapoport , Jason Gunthorpe , Vlastimil Babka , Mahesh Salgaonkar , Andrey Ryabinin , Alexey Dobriyan , Ingo Molnar , Andrea Arcangeli , Ralph Campbell , Arnd Bergmann , Jann Horn , John Hubbard , Jesper Dangaard Brouer , Nicholas Piggin , =?iso-8859-1?B?Suly9G1l?= Glisse , Mathieu Desnoyers , kvm-ppc@vger.kernel.org, Thomas Gleixner , Reza Arbab , Allison Randal , Christian Brauner , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, Logan Gunthorpe , Souptick Joarder , Andrew Morton , linuxppc-dev@lists.ozlabs.org, Roman Gushchin , "Kirill A. Shutemov" , Al Viro Subject: Re: [PATCH v5 00/11] Introduces new count-based method for tracking lockless pagetable walks Message-ID: <20191004125756.GA32620@hirez.programming.kicks-ass.net> References: <20191003013325.2614-1-leonardo@linux.ibm.com> <20191003072952.GN4536@hirez.programming.kicks-ass.net> <20191004114236.GD19463@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191004114236.GD19463@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 04, 2019 at 01:42:36PM +0200, Peter Zijlstra wrote: > If you can find anything there that isn't right, please explain that in > detail and we'll need to look hard at fixing _that_. Also, I can't imagine Nick is happy with 128 CPUs banging on that atomic counter, esp. since atomics are horrifically slow on Power.