From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3511C43603 for ; Fri, 6 Dec 2019 21:38:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 74C782173E for ; Fri, 6 Dec 2019 21:38:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jgEJU+As" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726453AbfLFViu (ORCPT ); Fri, 6 Dec 2019 16:38:50 -0500 Received: from mail-pl1-f194.google.com ([209.85.214.194]:34005 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726353AbfLFViu (ORCPT ); Fri, 6 Dec 2019 16:38:50 -0500 Received: by mail-pl1-f194.google.com with SMTP id h13so3269562plr.1 for ; Fri, 06 Dec 2019 13:38:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=ZlgEGCoRBrwllaA7U2SAUVjC8HUYX60EMP5Y/3amAn0=; b=jgEJU+As5FSIOZlub2wjdTo8pVKmMIzTJr5KFD9NVZW/pwk10dhIFY3kkKPd4uQkFO K2Pqze31q2Jb6OFBkKYzHRkpGKc2zYgv86fBdP3lKy6CrfnOojTUndvbyEApTpueuk5R LKbZ+99rTKeaT/6kNTrom+qf0z0Av2QEHX6p6SyxL2rdjsCMLEwsn8Sn4KLopjGJz6ws occ+gBZw7JWqH4qyUz3ZFM+2dPMLO0rtttxR0MlqSqORqjBIy/vvqAFLfmWshGWgPlX7 zn596lEZj6+KeNMMIMLPT9rzjagTBbwVfZm/KvV6lAFnc4D/pUjk63kJ5CTxy+X+xNtG Po0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=ZlgEGCoRBrwllaA7U2SAUVjC8HUYX60EMP5Y/3amAn0=; b=JjM84HjC/wgjXkkCL1LUSXrppaWJMZkuvyI7cyP1WozrHuRmyLAnZNmHv0fP2SzJ4t buf+Ev4OFll/tnHpGSa4IyruD9iBmv8JybzVveTKrSfbuAX8AAI/cUZ7vZuUvOi+Yf4/ SJu7yBCORhX5ywF3X3LOrgh8GsuohFXXM/GGYDFV57np9iNEUae++r+t/wsmBr76OWLD XPXkddRsL5MQrVXYWJLWtcRopYCGv2CVdeVl8Hmzp8THVTJEAxrahmvVWBevW9u13lGb 74uRdcEkmpbdisL9xoEMZG25wSN3dhuUp7dqminVPao+scwtohUnqu4dgKoKxOZUb44T J54A== X-Gm-Message-State: APjAAAWH8V/rmvvRNHQeATTtpsPI79EE2zxiF4xiP17oEE7DnohQzuOu sCLPbHgVTIkQx7TPBhlZB04= X-Google-Smtp-Source: APXvYqxe4zVmJNJ/Y2SwMtb3yAWgZFOU/4WmWsfv9qXCGeY4gymy26reF+DXb4wxVC87ebaO89EKMQ== X-Received: by 2002:a17:90a:8c12:: with SMTP id a18mr9384987pjo.53.1575668329626; Fri, 06 Dec 2019 13:38:49 -0800 (PST) Received: from tw-172-25-31-76.office.twttr.net ([8.25.197.24]) by smtp.gmail.com with ESMTPSA id d65sm17368579pfa.159.2019.12.06.13.38.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Dec 2019 13:38:48 -0800 (PST) From: Cong Wang To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, joro@8bytes.org, Cong Wang Subject: [Patch v3 0/3] iommu: reduce spinlock contention on fast path Date: Fri, 6 Dec 2019 13:38:00 -0800 Message-Id: <20191206213803.12580-1-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset contains three small optimizations for the global spinlock contention in IOVA cache. Our memcache perf test shows this reduced its p999 latency down by 45% on AMD when IOMMU is enabled. Cong Wang (3): iommu: avoid unnecessary magazine allocations iommu: optimize iova_magazine_free_pfns() iommu: avoid taking iova_rbtree_lock twice --- drivers/iommu/iova.c | 75 ++++++++++++++++++++++++++------------------ 1 file changed, 45 insertions(+), 30 deletions(-) -- 2.21.0