From patchwork Thu Apr 26 10:34:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 134466 Delivered-To: patch@linaro.org Received: by 10.46.151.6 with SMTP id r6csp2078837lji; Thu, 26 Apr 2018 03:34:17 -0700 (PDT) X-Google-Smtp-Source: AIpwx4/FMnuFIcb/Iflu4+v9rQSGebOSSarbT10swew6GCZIsXZsOBBcyMDl1Zs63KkngNCRpUCQ X-Received: by 2002:a17:902:7d92:: with SMTP id a18-v6mr33573951plm.331.1524738857471; Thu, 26 Apr 2018 03:34:17 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1524738857; cv=none; d=google.com; s=arc-20160816; b=yrahiX0cOTvfKooykucR7P8L/TefL9NAHC0ySd2xEZIZTZuElZGGI3F+e6+7+cc/c5 w9PLp62Gc3zQ/y8Gkr4xeKjNUBmBIT3Q0QoJt/rbNxK8oS+QJCjHxx7bbUO0O2T00NbS dnvUJ8ddWDrgEnoOBU9eSZwE4Nkut2WHXAbbtxxXLY1T+lYVtr/4D6Kk9eMTh1rNp9RB cbaqmVJ1OTxknM07+am1EJEMJKDXkTWkHLbC/ZxRRAZYGFQoEG35c0yLqJzfE4AS2k/3 7z4brFLOXQe/DAKWqZIU/VsGI9je8AR7tUWoctxfWYjCXncTAMgrlYFNoPalGsMlORZ4 hoKA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:subject:cc:to:from :arc-authentication-results; bh=Ge+W598HBk+7Iyp0fb3i6QgoXZgs/9SXzqJoOinZDOg=; b=hIbJJiWqh1ZIIr2biZ5V56LAuFxkmbN8fg2zP9wocz6FybvPDiyIWpyEN4VZr1CNxr AC0N/BgjRiClyHE3/GXTS6qdimbqLLNwUhcmeAew7vxkY8Eww9iNh3UE2QPVmwraN+Yk leQY7b6dK9SXmomZiCyReWJINmk+X4ix/CSofzIkzFFKJP7UWG0eDrq81ExockkT3Lp6 k66IYP+zeLw16cBVqECn1M8B0AjKe4u3i2bZ+OY1ifJ0/NNSMnkJwafPC5T+SVH5zNk+ XXgMdrA2+A3UnRxoHu9znJy/leHq9FvcJArDrL1fE/BsU357tKp7uV4xwD7y2IdVmp8+ zBJw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id az2-v6si4315596plb.555.2018.04.26.03.34.17; Thu, 26 Apr 2018 03:34:17 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755438AbeDZKeN (ORCPT + 29 others); Thu, 26 Apr 2018 06:34:13 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:50964 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753403AbeDZKeJ (ORCPT ); Thu, 26 Apr 2018 06:34:09 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4C2B815AD; Thu, 26 Apr 2018 03:34:09 -0700 (PDT) Received: from edgewater-inn.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 1DBE33F487; Thu, 26 Apr 2018 03:34:09 -0700 (PDT) Received: by edgewater-inn.cambridge.arm.com (Postfix, from userid 1000) id C651A1AE5098; Thu, 26 Apr 2018 11:34:28 +0100 (BST) From: Will Deacon To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, peterz@infradead.org, mingo@kernel.org, boqun.feng@gmail.com, paulmck@linux.vnet.ibm.com, longman@redhat.com, will.deacon@arm.com Subject: [PATCH v3 00/14] kernel/locking: qspinlock improvements Date: Thu, 26 Apr 2018 11:34:14 +0100 Message-Id: <1524738868-31318-1-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, This is version three of the qspinlock patches I posted previously: v1: https://lkml.org/lkml/2018/4/5/496 v2: https://lkml.org/lkml/2018/4/11/618 Changes since v2 include: * Fixed bisection issues * Fixed x86 PV build * Added patch proposing me as a co-maintainer * Rebased onto -rc2 All feedback welcome, Will --->8 Jason Low (1): locking/mcs: Use smp_cond_load_acquire() in mcs spin loop Waiman Long (1): locking/qspinlock: Add stat tracking for pending vs slowpath Will Deacon (12): barriers: Introduce smp_cond_load_relaxed and atomic_cond_read_relaxed locking/qspinlock: Merge struct __qspinlock into struct qspinlock locking/qspinlock: Bound spinning on pending->locked transition in slowpath locking/qspinlock/x86: Increase _Q_PENDING_LOOPS upper bound locking/qspinlock: Remove unbounded cmpxchg loop from locking slowpath locking/qspinlock: Kill cmpxchg loop when claiming lock from head of queue locking/qspinlock: Use atomic_cond_read_acquire locking/qspinlock: Use smp_cond_load_relaxed to wait for next node locking/qspinlock: Make queued_spin_unlock use smp_store_release locking/qspinlock: Elide back-to-back RELEASE operations with smp_wmb() locking/qspinlock: Use try_cmpxchg instead of cmpxchg when locking MAINTAINERS: Add myself as a co-maintainer for LOCKING PRIMITIVES MAINTAINERS | 1 + arch/x86/include/asm/qspinlock.h | 21 ++- arch/x86/include/asm/qspinlock_paravirt.h | 3 +- include/asm-generic/atomic-long.h | 2 + include/asm-generic/barrier.h | 27 +++- include/asm-generic/qspinlock.h | 2 +- include/asm-generic/qspinlock_types.h | 32 +++- include/linux/atomic.h | 2 + kernel/locking/mcs_spinlock.h | 10 +- kernel/locking/qspinlock.c | 247 ++++++++++++++---------------- kernel/locking/qspinlock_paravirt.h | 44 ++---- kernel/locking/qspinlock_stat.h | 9 +- 12 files changed, 209 insertions(+), 191 deletions(-) -- 2.1.4 Acked-by: Peter Zijlstra (Intel) Acked-by: Waiman Long