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=-0.6 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 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 2E5B8C32771 for ; Mon, 20 Jan 2020 23:11:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2FA4208E4 for ; Mon, 20 Jan 2020 23:11:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Y7HdRjx/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726991AbgATXLK (ORCPT ); Mon, 20 Jan 2020 18:11:10 -0500 Received: from mail-ot1-f47.google.com ([209.85.210.47]:43725 "EHLO mail-ot1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726816AbgATXLJ (ORCPT ); Mon, 20 Jan 2020 18:11:09 -0500 Received: by mail-ot1-f47.google.com with SMTP id p8so1249484oth.10 for ; Mon, 20 Jan 2020 15:11:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=SKP8yEJvIPRamm38nq6sQHvFo27I9jjAhAnyLSp8Eqk=; b=Y7HdRjx/0l6IwR2zYR/jo0+1FnpycOhLEVpMVNTtZkLwJUCKY6np7xTsU+u6u8IP9X P0Q9lyDZ8MNaE6lAPyw2S2GMfYSBxUG4U5aQJeW6mjlopDYDiKvnjsKC//2++5jBo4Lh 5cBvbbhmCLO71b6SPdHmQsNgPfQHfanCnji+xABCuJdiPWk9glXGjiXPR5SmorQPAWQi PFdJ8VY2/jFlrqhLgsuhGYuUYbKZlsvT9xXVIYvrRw1QsD0Cx1INkCRAmVgYC/4+nXm1 OGqRp8TIZ/jeNLfUxmp5R4xXJfrjoSrykSYH9MKHGnHLj2DhTa5BTHJkin7iczp03Cpp TnJQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=SKP8yEJvIPRamm38nq6sQHvFo27I9jjAhAnyLSp8Eqk=; b=TOEPsNou1NU0ryVlw8mgiewLdQ0M3FC72ElFiwwoPhHkLvBLfvqu83V9J6Vr1Gh3/X GUonO+5PgZCJbUiQ5UpX9ekTc8bOjMvf1SqqTyQEl7Ru+5SNmW/OllSJ7PqKZVUL20W3 tLEFssC3CnXJybmyarnoDUye/4pZwjqKctRiqusE2Px1Hf1rIPl3UQWv0iyMq5OOF/26 VrVBCn65T/2da3xgp2bFZ3sjwxNku7SEl0RGT3XiHAybKYrPhZAHUycEz7zIIf2e35bs +0UpmXDGqgIC6WJghj8eW1/vVYW9vGHQ9ITYwWMfcXTAo+Y4HcmWwqi7DmOLIEG3TBJk rZFw== X-Gm-Message-State: APjAAAWdjJikV4ppgTYcUrJXYEqyczL/F0Gx9VeJQ6yzoIiqqRYb8mDJ BmGXAZ/zEThiER9QoGLsok5DmuhozkkoPpzJc2vrk6JH2W8= X-Google-Smtp-Source: APXvYqxxBZWfhkjN4YVm5NI7lG9BUUPEcKfenADjWPC3pOFkvl0dIBsvoXwj1dFzaaYrU70ZrtlGQ7wrF28XJJq66AQ= X-Received: by 2002:a9d:da2:: with SMTP id 31mr1326815ots.319.1579561868762; Mon, 20 Jan 2020 15:11:08 -0800 (PST) MIME-Version: 1.0 References: <20191218043951.10534-1-xiyou.wangcong@gmail.com> In-Reply-To: <20191218043951.10534-1-xiyou.wangcong@gmail.com> From: Cong Wang Date: Mon, 20 Jan 2020 15:10:57 -0800 Message-ID: Subject: Re: [Patch v3 0/3] iommu: reduce spinlock contention on fast path To: iommu@lists.linux-foundation.org Cc: Robin Murphy , LKML , Joerg Roedel Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 17, 2019 at 8:40 PM Cong Wang wrote: > > 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.) Hi, Joerg Can you take these patches? Thanks!