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 3F86BC43603 for ; Wed, 18 Dec 2019 04:40:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EC1B120715 for ; Wed, 18 Dec 2019 04:40:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="UL0PfpNM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726591AbfLREkS (ORCPT ); Tue, 17 Dec 2019 23:40:18 -0500 Received: from mail-pg1-f196.google.com ([209.85.215.196]:46371 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726463AbfLREkS (ORCPT ); Tue, 17 Dec 2019 23:40:18 -0500 Received: by mail-pg1-f196.google.com with SMTP id z124so528672pgb.13 for ; Tue, 17 Dec 2019 20:40:18 -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=HQJWlXLG6wIwMc0aEcbqaUZ0sC986f7UTtyRAVS20kc=; b=UL0PfpNM1vMMyCDUHBSnIFUHHrh3Vn6JWSKqsuKHxs34u58j2OEtg87+kqO/Fb0rNh NPFKLSPkfBl0slk9ERABT+HIp+YdWrEgxoroON1zDP/qhCOhurrsNhaL2isRr3rSJqj/ Mpi2hqGwLa88m2W8+iX8YoOAJu7Pv0sPPdISUvl7y+0BNwfbydadsDOcLHEuwk28OwC4 Lv2GbBcl1EGV5GvvXJQVWlMQKIrfRmFUJ0IciOmvObSVcO7BxFAGQLTeCfvVJIqa7oFr Lmo0wGhulCkYiVAjcLUcQfO6QwepXR8rks5XeNepM0CSJjFjWqCQYqW670YjSvNj1mlQ PVNA== 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=HQJWlXLG6wIwMc0aEcbqaUZ0sC986f7UTtyRAVS20kc=; b=udXacIclLVwjF0T/HqShY2PoBjO6al5tgbC4tHx7DBQ0+iHkJ6P+ksgB5qr9js0JAt BPYH1Go47nImxuIeeYLRnGII+PzvuTGhg37Zv+/ury8XdzNFroQ11eEjcrQVjkUwPneV kzvf4GoprykJ5ZSh7FFoGJadZaC/46y+SrE/yJ4LCjQOOJqpTd8Nf89bG7G3JjGsN/PR QO4sZ1cDeRSvDbN6uzrKoQ3weFc+v6Je34fS+aJ5gs+gcg6kf2/xjQLuyxhXKVCqBZ9s znShDlHn38aGRRhUn8jrn0RJx4+ptYoBsqpEU41P0WZNU3NkydycMOzKzya5uy74l3Oo kq/A== X-Gm-Message-State: APjAAAVvGEg+JX1JKIUPjkEjyS0MMFuBB0qE1zHNgu3HC7QC83UKn1Qa YJd50jmW10FAbz+6srPpdQDVhZ0q0so= X-Google-Smtp-Source: APXvYqx4iNPHn22Lr5oaFHZmr8Lnu+1lktiB7oRLjpeOEOd9kUF651mdDGt88/A5DCgd46IlHm3fVQ== X-Received: by 2002:a63:f202:: with SMTP id v2mr679275pgh.420.1576644017839; Tue, 17 Dec 2019 20:40:17 -0800 (PST) Received: from tw-172-25-31-76.office.twttr.net ([8.25.197.24]) by smtp.gmail.com with ESMTPSA id j21sm781105pfe.175.2019.12.17.20.40.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2019 20:40:17 -0800 (PST) From: Cong Wang To: iommu@lists.linux-foundation.org Cc: robin.murphy@arm.com, linux-kernel@vger.kernel.org, joro@8bytes.org, Cong Wang Subject: [Patch v3 0/3] iommu: reduce spinlock contention on fast path Date: Tue, 17 Dec 2019 20:39:48 -0800 Message-Id: <20191218043951.10534-1-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. (Resending v3 on Joerg's request.) Cong Wang (3): iommu: avoid unnecessary magazine allocations iommu: optimize iova_magazine_free_pfns() iommu: avoid taking iova_rbtree_lock twice --- v3: improve changelog, no code change v2: fix a memory leak drivers/iommu/iova.c | 75 ++++++++++++++++++++++++++------------------ 1 file changed, 45 insertions(+), 30 deletions(-) -- 2.21.0 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=-3.3 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,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 8B118C2D0C3 for ; Wed, 18 Dec 2019 04:40:21 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4C5AA20715 for ; 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d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=HQJWlXLG6wIwMc0aEcbqaUZ0sC986f7UTtyRAVS20kc=; b=UL0PfpNM1vMMyCDUHBSnIFUHHrh3Vn6JWSKqsuKHxs34u58j2OEtg87+kqO/Fb0rNh NPFKLSPkfBl0slk9ERABT+HIp+YdWrEgxoroON1zDP/qhCOhurrsNhaL2isRr3rSJqj/ Mpi2hqGwLa88m2W8+iX8YoOAJu7Pv0sPPdISUvl7y+0BNwfbydadsDOcLHEuwk28OwC4 Lv2GbBcl1EGV5GvvXJQVWlMQKIrfRmFUJ0IciOmvObSVcO7BxFAGQLTeCfvVJIqa7oFr Lmo0wGhulCkYiVAjcLUcQfO6QwepXR8rks5XeNepM0CSJjFjWqCQYqW670YjSvNj1mlQ PVNA== 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=HQJWlXLG6wIwMc0aEcbqaUZ0sC986f7UTtyRAVS20kc=; b=WTffR4CfXadZme0SIE+I34Nwp/rg6WwOuqHdNzmAlRwdh2dHROIApTcu2sorpdUCkr g/+YvJsqHO/1Pm39dpB80BVQmq/mV3KVdcp9Jmgb33ixs6jZfpC0jwIkqIdjwCZk9FkP 4JoLu5E250/Kv8VyLuX01yWnOMlyvrbrhqJ+s1E4vSEb2D130q5eMrqpWXN7DOzUn6zw 00QtMPJlXl2t037CRFd0gxeEG6jLdsQB+fF1BibFekjnTaU5x0oLOyTNeQS3ikddIp1W PXhgJzgCby2n/Lvp2UvTtyWOGSfZlSaTAgfTEA6fCh1BMJE5jMRMFkQ1K102T3udWI8O uFLw== X-Gm-Message-State: APjAAAUQ0QGb7WOEuKIp+eEeQPt2KrHf5IiPZF7JhtsarJIpST2Lvkmr y5RZTHfWas/meWlW25Y5meQJUXPeILo= X-Google-Smtp-Source: APXvYqx4iNPHn22Lr5oaFHZmr8Lnu+1lktiB7oRLjpeOEOd9kUF651mdDGt88/A5DCgd46IlHm3fVQ== X-Received: by 2002:a63:f202:: with SMTP id v2mr679275pgh.420.1576644017839; Tue, 17 Dec 2019 20:40:17 -0800 (PST) Received: from tw-172-25-31-76.office.twttr.net ([8.25.197.24]) by smtp.gmail.com with ESMTPSA id j21sm781105pfe.175.2019.12.17.20.40.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Dec 2019 20:40:17 -0800 (PST) From: Cong Wang To: iommu@lists.linux-foundation.org Subject: [Patch v3 0/3] iommu: reduce spinlock contention on fast path Date: Tue, 17 Dec 2019 20:39:48 -0800 Message-Id: <20191218043951.10534-1-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Cc: Cong Wang , robin.murphy@arm.com, linux-kernel@vger.kernel.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" 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. (Resending v3 on Joerg's request.) Cong Wang (3): iommu: avoid unnecessary magazine allocations iommu: optimize iova_magazine_free_pfns() iommu: avoid taking iova_rbtree_lock twice --- v3: improve changelog, no code change v2: fix a memory leak drivers/iommu/iova.c | 75 ++++++++++++++++++++++++++------------------ 1 file changed, 45 insertions(+), 30 deletions(-) -- 2.21.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu