From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yury Norov Subject: [PATCH 0/3] arm64: queued spinlocks and rw-locks Date: Wed, 3 May 2017 17:51:38 +0300 Message-ID: <20170503145141.4966-1-ynorov@caviumnetworks.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from mail-bn3nam01on0088.outbound.protection.outlook.com ([104.47.33.88]:23131 "EHLO NAM01-BN3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751118AbdECOwC (ORCPT ); Wed, 3 May 2017 10:52:02 -0400 Sender: linux-arch-owner@vger.kernel.org List-ID: To: Will Deacon , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Yury Norov , Adam Wallis , Andrew Pinski , Arnd Bergmann , Catalin Marinas , Ingo Molnar , Jan Glauber , Mark Rutland , Pan Xinhui The patch 3 adds implementation for queued-based locking on ARM64, and the option in kernel config to enable it. Patches 1 and 2 fix some mess in header files to apply patch 3 smoothly. Tested on QDF2400 with huge improvements with these patches on the torture tests, by Adam Wallis. Tested on ThunderX, by Andrew Pinski: 120 thread (30 core - 4 thread/core) CN99xx (single socket): benchmark Units qspinlocks vs ticket locks sched/messaging s 73.91% sched/pipe ops/s 104.18% futex/hash ops/s 103.87% futex/wake ms 71.04% futex/wake-parallel ms 93.88% futex/requeue ms 96.47% futex/lock-pi ops/s 118.33% Notice, there's the queued locks implementation for the Power PC introduced by Pan Xinhui. He largely tested it and also found significant performance gain. In arch part it is very similar to this patch though. https://lwn.net/Articles/701137/ RFC: https://www.spinics.net/lists/arm-kernel/msg575575.html v1: - queued_spin_unlock_wait() and queued_spin_is_locked() are re-implemented in arch part to add additional memory barriers; - queued locks are made optional, ticket locks are enabled by default. Jan Glauber (1): arm64/locking: qspinlocks and qrwlocks support Yury Norov (2): kernel/locking: #include in qrwlock.c asm-generic: don't #include in qspinlock_types.h arch/arm64/Kconfig | 24 +++++++++++++++++++ arch/arm64/include/asm/qrwlock.h | 7 ++++++ arch/arm64/include/asm/qspinlock.h | 42 +++++++++++++++++++++++++++++++++ arch/arm64/include/asm/spinlock.h | 12 ++++++++++ arch/arm64/include/asm/spinlock_types.h | 14 ++++++++--- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/qspinlock.c | 34 ++++++++++++++++++++++++++ include/asm-generic/qspinlock.h | 1 + include/asm-generic/qspinlock_types.h | 8 ------- kernel/locking/qrwlock.c | 1 + 10 files changed, 133 insertions(+), 11 deletions(-) create mode 100644 arch/arm64/include/asm/qrwlock.h create mode 100644 arch/arm64/include/asm/qspinlock.h create mode 100644 arch/arm64/kernel/qspinlock.c -- 2.11.0