From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [PATCH v4 0/3] locking/rwsem: Rwsem rearchitecture part 0 Date: Thu, 14 Feb 2019 11:37:15 +0100 Message-ID: <20190214103715.GI32494@hirez.programming.kicks-ass.net> References: <1550095217-12047-1-git-send-email-longman@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1550095217-12047-1-git-send-email-longman@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Waiman Long Cc: linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Will Deacon , linux-mips@vger.kernel.org, "H. Peter Anvin" , sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Davidlohr Bueso , linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org, x86@kernel.org, Ingo Molnar , uclinux-h8-devel@lists.sourceforge.jp, linux-xtensa@linux-xtensa.org, Arnd Bergmann , linux-um@lists.infradead.org, linux-m68k@lists.linux-m68k.org, openrisc@lists.librecores.org, Borislav Petkov , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Tim Chen , linux-parisc@vger.kernel.org, Linus Torvalds , linux-kernel@vger.kernel.org, linux-alpha@vger.ker List-Id: linux-arch.vger.kernel.org On Wed, Feb 13, 2019 at 05:00:14PM -0500, Waiman Long wrote: > v4: > - Remove rwsem-spinlock.c and make all archs use rwsem-xadd.c. > > v3: > - Optimize __down_read_trylock() for the uncontended case as suggested > by Linus. > > v2: > - Add patch 2 to optimize __down_read_trylock() as suggested by PeterZ. > - Update performance test data in patch 1. > > The goal of this patchset is to remove the architecture specific files > for rwsem-xadd to make it easer to add enhancements in the later rwsem > patches. It also removes the legacy rwsem-spinlock.c file and make all > the architectures use one single implementation of rwsem - rwsem-xadd.c. > > Waiman Long (3): > locking/rwsem: Remove arch specific rwsem files > locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all > archs > locking/rwsem: Optimize down_read_trylock() Acked-by: Peter Zijlstra (Intel) with the caveat that I'm happy to exchange patch 3 back to my earlier suggestion in case Will expesses concerns wrt the ARM64 performance of Linus' suggestion. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from merlin.infradead.org ([205.233.59.134]:54332 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727539AbfBNKhl (ORCPT ); Thu, 14 Feb 2019 05:37:41 -0500 Date: Thu, 14 Feb 2019 11:37:15 +0100 From: Peter Zijlstra Subject: Re: [PATCH v4 0/3] locking/rwsem: Rwsem rearchitecture part 0 Message-ID: <20190214103715.GI32494@hirez.programming.kicks-ass.net> References: <1550095217-12047-1-git-send-email-longman@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1550095217-12047-1-git-send-email-longman@redhat.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Waiman Long Cc: Ingo Molnar , Will Deacon , Thomas Gleixner , linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-c6x-dev@linux-c6x.org, uclinux-h8-devel@lists.sourceforge.jp, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, nios2-dev@lists.rocketboards.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org, x86@kernel.org, Arnd Bergmann , Borislav Petkov , "H. Peter Anvin" , Davidlohr Bueso , Linus Torvalds , Andrew Morton , Tim Chen Message-ID: <20190214103715.O61xiyDUtFfJywghpz2Nwi_R2OMcuxbREoUd59m9Ey4@z> On Wed, Feb 13, 2019 at 05:00:14PM -0500, Waiman Long wrote: > v4: > - Remove rwsem-spinlock.c and make all archs use rwsem-xadd.c. > > v3: > - Optimize __down_read_trylock() for the uncontended case as suggested > by Linus. > > v2: > - Add patch 2 to optimize __down_read_trylock() as suggested by PeterZ. > - Update performance test data in patch 1. > > The goal of this patchset is to remove the architecture specific files > for rwsem-xadd to make it easer to add enhancements in the later rwsem > patches. It also removes the legacy rwsem-spinlock.c file and make all > the architectures use one single implementation of rwsem - rwsem-xadd.c. > > Waiman Long (3): > locking/rwsem: Remove arch specific rwsem files > locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all > archs > locking/rwsem: Optimize down_read_trylock() Acked-by: Peter Zijlstra (Intel) with the caveat that I'm happy to exchange patch 3 back to my earlier suggestion in case Will expesses concerns wrt the ARM64 performance of Linus' suggestion.