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[195.135.220.15]) by mx.google.com with ESMTPS id i11si1370640eds.276.2019.04.23.11.13.31 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 23 Apr 2019 11:13:31 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning dave@stgolabs.net does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning dave@stgolabs.net does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=dave@stgolabs.net X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 33DE3AEBF; Tue, 23 Apr 2019 18:13:30 +0000 (UTC) Date: Tue, 23 Apr 2019 11:13:15 -0700 From: Davidlohr Bueso To: Peter Zijlstra Cc: Laurent Dufour , akpm@linux-foundation.org, mhocko@kernel.org, kirill@shutemov.name, ak@linux.intel.com, jack@suse.cz, Matthew Wilcox , aneesh.kumar@linux.ibm.com, benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, Thomas Gleixner , Ingo Molnar , hpa@zytor.com, Will Deacon , Sergey Senozhatsky , sergey.senozhatsky.work@gmail.com, Andrea Arcangeli , Alexei Starovoitov , kemi.wang@intel.com, Daniel Jordan , David Rientjes , Jerome Glisse , Ganesh Mahendran , Minchan Kim , Punit Agrawal , vinayak menon , Yang Shi , zhong jiang , Haiyan Song , Balbir Singh , sj38.park@gmail.com, Michel Lespinasse , Mike Rapoport , linux-kernel@vger.kernel.org, linux-mm@kvack.org, haren@linux.vnet.ibm.com, npiggin@gmail.com, paulmck@linux.vnet.ibm.com, Tim Chen , linuxppc-dev@lists.ozlabs.org, x86@kernel.org Subject: Re: [PATCH v12 21/31] mm: Introduce find_vma_rcu() Message-ID: <20190423181314.wmhy2v2siiz35yzo@linux-r8p5> Mail-Followup-To: Peter Zijlstra , Laurent Dufour , akpm@linux-foundation.org, mhocko@kernel.org, kirill@shutemov.name, ak@linux.intel.com, jack@suse.cz, Matthew Wilcox , aneesh.kumar@linux.ibm.com, benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, Thomas Gleixner , Ingo Molnar , hpa@zytor.com, Will Deacon , Sergey Senozhatsky , sergey.senozhatsky.work@gmail.com, Andrea Arcangeli , Alexei Starovoitov , kemi.wang@intel.com, Daniel Jordan , David Rientjes , Jerome Glisse , Ganesh Mahendran , Minchan Kim , Punit Agrawal , vinayak menon , Yang Shi , zhong jiang , Haiyan Song , Balbir Singh , sj38.park@gmail.com, Michel Lespinasse , Mike Rapoport , linux-kernel@vger.kernel.org, linux-mm@kvack.org, haren@linux.vnet.ibm.com, npiggin@gmail.com, paulmck@linux.vnet.ibm.com, Tim Chen , linuxppc-dev@lists.ozlabs.org, x86@kernel.org References: <20190416134522.17540-1-ldufour@linux.ibm.com> <20190416134522.17540-22-ldufour@linux.ibm.com> <20190423092710.GI11158@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20190423092710.GI11158@hirez.programming.kicks-ass.net> User-Agent: NeoMutt/20180323 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 Tue, 23 Apr 2019, Peter Zijlstra wrote: >Also; the initial motivation was prefaulting large VMAs and the >contention on mmap was killing things; but similarly, the contention on >the refcount (I did try that) killed things just the same. Right, this is just like what can happen with per-vma locking. Thanks, Davidlohr