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[14.202.194.140]) by smtp.gmail.com with ESMTPSA id r1-v6sm59238353pfb.41.2018.11.05.02.42.07 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 05 Nov 2018 02:42:08 -0800 (PST) Date: Mon, 5 Nov 2018 21:42:04 +1100 From: Balbir Singh To: Laurent Dufour Cc: akpm@linux-foundation.org, mhocko@kernel.org, peterz@infradead.org, kirill@shutemov.name, ak@linux.intel.com, dave@stgolabs.net, jack@suse.cz, Matthew Wilcox , khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.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 , 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 v11 00/26] Speculative page faults Message-ID: <20181105104204.GB9042@350D> References: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 17, 2018 at 01:06:07PM +0200, Laurent Dufour wrote: > This is a port on kernel 4.17 of the work done by Peter Zijlstra to handle > page fault without holding the mm semaphore [1]. > > The idea is to try to handle user space page faults without holding the > mmap_sem. This should allow better concurrency for massively threaded Question -- I presume mmap_sem (rw_semaphore implementation tested against) was qrwlock? Balbir Singh. 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[14.202.194.140]) by smtp.gmail.com with ESMTPSA id r1-v6sm59238353pfb.41.2018.11.05.02.42.07 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 05 Nov 2018 02:42:08 -0800 (PST) Date: Mon, 5 Nov 2018 21:42:04 +1100 From: Balbir Singh To: Laurent Dufour Subject: Re: [PATCH v11 00/26] Speculative page faults Message-ID: <20181105104204.GB9042@350D> References: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1526555193-7242-1-git-send-email-ldufour@linux.vnet.ibm.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jack@suse.cz, sergey.senozhatsky.work@gmail.com, peterz@infradead.org, Will Deacon , mhocko@kernel.org, linux-mm@kvack.org, paulus@samba.org, Punit Agrawal , hpa@zytor.com, Alexei Starovoitov , khandual@linux.vnet.ibm.com, Andrea Arcangeli , ak@linux.intel.com, Minchan Kim , x86@kernel.org, Matthew Wilcox , Daniel Jordan , Ingo Molnar , David Rientjes , paulmck@linux.vnet.ibm.com, npiggin@gmail.com, Jerome Glisse , dave@stgolabs.net, kemi.wang@intel.com, kirill@shutemov.name, Thomas Gleixner , Ganesh Mahendran , Yang Shi , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky , vinayak menon , aneesh.kumar@linux.vnet.ibm.com, akpm@linux-foundation.org, Tim Chen , haren@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, May 17, 2018 at 01:06:07PM +0200, Laurent Dufour wrote: > This is a port on kernel 4.17 of the work done by Peter Zijlstra to handle > page fault without holding the mm semaphore [1]. > > The idea is to try to handle user space page faults without holding the > mmap_sem. This should allow better concurrency for massively threaded Question -- I presume mmap_sem (rw_semaphore implementation tested against) was qrwlock? Balbir Singh.