From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pan Xinhui Subject: [PATCH v3 0/6] powerpc use pv-qpsinlock as the default spinlock implemention Date: Wed, 25 May 2016 16:18:03 +0800 Message-ID: <1464164289-6124-1-git-send-email-xinhui.pan@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux-foundation.org Cc: jeremy@goop.org, Pan Xinhui , peterz@infradead.org, benh@kernel.crashing.org, chrisw@sous-sol.org, mingo@redhat.com, paulus@samba.org, mpe@ellerman.id.au, akataria@vmware.com, paulmck@linux.vnet.ibm.com List-Id: virtualization@lists.linuxfoundation.org change from v2: __spin_yeild_cpu() will yield slices to lpar if target cpu is running. remove unnecessary rmb() in __spin_yield/wake_cpu. __pv_wait() will check the *ptr == val. some commit message change change fome v1: separate into 6 pathes from one patch some minor code changes. I do several tests on pseries IBM,8408-E8E with 32cpus, 64GB memory. benchmark test results are below. 2 perf tests: perf bench futex hash perf bench futex lock-pi _____test________________spinlcok______________pv-qspinlcok_____ |futex hash | 556370 ops | 629634 ops | |futex lock-pi | 362 ops | 367 ops | scheduler test: Test how many loops of schedule() can finish within 10 seconds on all cpus. _____test________________spinlcok______________pv-qspinlcok_____ |schedule() loops| 322811921 | 311449290 | kernel compiling test: build a linux kernel image to see how long it took _____test________________spinlcok______________pv-qspinlcok_____ | compiling takes| 22m | 22m | Pan Xinhui (6): qspinlock: powerpc support qspinlock powerpc: pseries/Kconfig: Add qspinlock build config powerpc: lib/locks.c: Add cpu yield/wake helper function pv-qspinlock: powerpc support pv-qspinlock pv-qspinlock: use cmpxchg_release in __pv_queued_spin_unlock powerpc: pseries: Add pv-qspinlock build config/make arch/powerpc/include/asm/qspinlock.h | 39 +++++++++++++++++++ arch/powerpc/include/asm/qspinlock_paravirt.h | 38 ++++++++++++++++++ .../powerpc/include/asm/qspinlock_paravirt_types.h | 13 +++++++ arch/powerpc/include/asm/spinlock.h | 31 +++++++++------ arch/powerpc/include/asm/spinlock_types.h | 4 ++ arch/powerpc/kernel/Makefile | 1 + arch/powerpc/kernel/paravirt.c | 45 ++++++++++++++++++++++ arch/powerpc/lib/locks.c | 37 ++++++++++++++++++ arch/powerpc/platforms/pseries/Kconfig | 9 +++++ arch/powerpc/platforms/pseries/setup.c | 5 +++ kernel/locking/qspinlock_paravirt.h | 2 +- 11 files changed, 211 insertions(+), 13 deletions(-) create mode 100644 arch/powerpc/include/asm/qspinlock.h create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt.h create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt_types.h create mode 100644 arch/powerpc/kernel/paravirt.c -- 1.9.1