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 2105DC432C0 for ; Fri, 29 Nov 2019 00:49:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D7B342176D for ; Fri, 29 Nov 2019 00:49:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KJSvsdf/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726700AbfK2AtT (ORCPT ); Thu, 28 Nov 2019 19:49:19 -0500 Received: from mail-pg1-f194.google.com ([209.85.215.194]:37947 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726657AbfK2AtT (ORCPT ); Thu, 28 Nov 2019 19:49:19 -0500 Received: by mail-pg1-f194.google.com with SMTP id t3so13147570pgl.5 for ; Thu, 28 Nov 2019 16:49:19 -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=Er0BveApuGpZcCQ7MJvTFXGgSFZgN3u+8yAIisXO87k=; b=KJSvsdf/0VvkENZRJVgDMQrRC+eIsYDs5/nOxYRpDi/NLvNxd3TKM324hYHW/yrlWl 4JsY9BDUGZtjvXHId+SaDNc4pVBQ+Gmi0v8mswcl6zDhYkEDK4gFRkbNwhe8SXNoe6P0 heiQSIcALpjL3aVz1ZVdTvvsHgLrjJBOplBQXSX8BikLjuAlkLoBHcjdi49J/52uWfOs nXRQUCSm3c4BXU+7SRY8pL1rGg3zxcayX1oxs8KRnBF/yROeKJVHEP/xkPRA4LihuRkY aCeWiHbhJuG1ZfEw84K4aHjUwVmDQ8VToBfJ87kQROx4bgG7/ouUjJjuSzVYHzqiXO8h 88JA== 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=Er0BveApuGpZcCQ7MJvTFXGgSFZgN3u+8yAIisXO87k=; b=GR4ldHIoSRL4Waw1RKfFpaMHos4gQr+z371nqzvjadgQDZQ2TcWeVrTse5ff4pQ9Fk uapoZGp/Tnl29cqdSUzFfdNOjwTF4BlvLfuyKprtGYa/j5Oa3CYVu04ISkFgZ21mTUUK XQQ0PSwKhbGymxlUMeK5hLAjzYHioR/z8KkK/N+GLzd6kWuetyUmZP6T7+SHeKwvOiYn WyG0NtnwO+u4jUpd5VAYivd0SZZxzDn7sz21Vbog1P8maGBd4Druc7Xld5AoQ7CB4INT l6bHQj0sa3WFaGx3ho2rcti494iEOHtH5Bdu0z62nnEFFSSZtDjezL1xLl/Vk1tbmaBR iKqA== X-Gm-Message-State: APjAAAWHInoxd7YdKngwDgR5waeFupdGLCk7cOUfk/aBxgeJ9TsKp02e Dhm3KZOcdFx3UudmG0rKwFM= X-Google-Smtp-Source: APXvYqyApdPpftN+vV2nvmBBowUli4X7V/J8sYEkkUmC4LcmBfkr4EU4ECpWEHmh1EQEAxffn9W5nQ== X-Received: by 2002:a63:334f:: with SMTP id z76mr13701756pgz.277.1574988558791; Thu, 28 Nov 2019 16:49:18 -0800 (PST) Received: from tw-172-25-31-76.office.twttr.net ([8.25.197.24]) by smtp.gmail.com with ESMTPSA id 64sm22418202pfe.147.2019.11.28.16.49.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2019 16:49:18 -0800 (PST) From: Cong Wang To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, joro@8bytes.org, Cong Wang Subject: [Patch v2 0/3] iommu: reduce spinlock contention on fast path Date: Thu, 28 Nov 2019 16:48:52 -0800 Message-Id: <20191129004855.18506-1-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: match the original algorithm 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