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 A7CE4C432C0 for ; Thu, 21 Nov 2019 00:14:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D57B20730 for ; Thu, 21 Nov 2019 00:14:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="FtsVZiHS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726593AbfKUAOZ (ORCPT ); Wed, 20 Nov 2019 19:14:25 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:32832 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726044AbfKUAOZ (ORCPT ); Wed, 20 Nov 2019 19:14:25 -0500 Received: by mail-pg1-f193.google.com with SMTP id h27so614028pgn.0 for ; Wed, 20 Nov 2019 16:14:24 -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=iWcHlEgNUMXWNtKMo9fnHArr6iM67LDOF9B6/mC5eh0=; b=FtsVZiHS0XjHawCmjdwhHMQklah08Y+cI5JlQyrmYL0+HJeWbW4B5FqM/V3xIUNFps ESSb1QTy3Nqa2LHI/2Q9ErojKLztxhds+mZVEt7luzVOAlUOw+yHR1vuNjdrYy6VwAX4 l1DeaynlLib7Wb9UOYvUSuEjZ1gM7AqyJI9iFecvlu2FBuwabg+BznsHDiwda8a6qIkC lgFeurHDPHcZEfCAG0tH1S5MrFlAc8Kxj3zegQIr3/f/xnuN7kR5OTaAN+1rXyfvMsH0 Hrj+lDNatJ0cM0EbflECXE+f9IQSp0Cb7RqlGH+cKLhgphjzx7e/q+1yXg7MbHNKT781 /hoA== 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=iWcHlEgNUMXWNtKMo9fnHArr6iM67LDOF9B6/mC5eh0=; b=RpnxtHynXSenWXYKuhG1EWgbrmNLl15AI8cAfh/nWXBxyxvmDSiPqmlcp8mhWQFjHv IjmkLUBSDopzalLQ/rqcFKN8CRDCWHmxVTM+0JGqVYRQmjyklTJ5aQIpmzdVCoOUw/5D 2tI8FuK2EIfENFc8Z4e/Elg/dlaVfiRtnQJ9XJcCSc9rL4PdmnUtuVo8MMK9Vmms1YqK n/vralQ5El+Zl7MlWEPROfMdlL37oD933u6TIptkRk/BPrJKzhv1tHKPmopoWTCq3yyn GCOCknC6G2sUvs0GhS2L3NNp+skztIlxd3u78VQHjjJZg0+W+QPdUaXw2DDoUvz9MfIL hBlw== X-Gm-Message-State: APjAAAXX3OHEvlp4YzStluGXe8toDa2dgVdLrXWZMTnFNzXuLEGvXaD4 A8nlqvYcWpjQ2YKAN6DtOR0TQav3t6U= X-Google-Smtp-Source: APXvYqzMz3F5gc0bmdB8045zo0z/zHlARfgRPm4Md5Gby/s36OsyddwO4k65Ri++p+1zF7BVsSTEyQ== X-Received: by 2002:a63:f48:: with SMTP id 8mr6308884pgp.329.1574295264037; Wed, 20 Nov 2019 16:14:24 -0800 (PST) Received: from tw-172-25-31-76.office.twttr.net ([8.25.197.24]) by smtp.gmail.com with ESMTPSA id r4sm565981pfl.61.2019.11.20.16.14.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Nov 2019 16:14:23 -0800 (PST) From: Cong Wang To: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org, joro@8bytes.org, Cong Wang Subject: [PATCH 0/3] iommu: reduce spinlock contention on fast path Date: Wed, 20 Nov 2019 16:13:45 -0800 Message-Id: <20191121001348.27230-1-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 | 44 +++++++++++++++++++++++++------------------- 1 file changed, 25 insertions(+), 19 deletions(-) -- 2.21.0