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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 21586C7618B for ; Thu, 25 Jul 2019 07:58:42 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (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 F1E1B217F4 for ; Thu, 25 Jul 2019 07:58:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F1E1B217F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id A384BD81; Thu, 25 Jul 2019 07:58:41 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 0FF03B7D for ; Thu, 25 Jul 2019 07:58:41 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 7E6127C for ; Thu, 25 Jul 2019 07:58:40 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 6739C3D5; Thu, 25 Jul 2019 09:58:38 +0200 (CEST) Date: Thu, 25 Jul 2019 09:58:38 +0200 From: Joerg Roedel To: Will Deacon Subject: Re: [RFC PATCH v2 04/19] iommu: Introduce struct iommu_iotlb_gather for batching TLB flushes Message-ID: <20190725075838.GB16597@8bytes.org> References: <20190711171927.28803-1-will@kernel.org> <20190711171927.28803-5-will@kernel.org> <20190724071959.GE1524@8bytes.org> <20190724074129.6pkcmutsoazrrklq@willie-the-truck> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190724074129.6pkcmutsoazrrklq@willie-the-truck> User-Agent: Mutt/1.9.4 (2018-02-28) Cc: Vijay Kilary , Jean-Philippe Brucker , Jon Masters , Jan Glauber , Alex Williamson , iommu@lists.linux-foundation.org, Jayachandran Chandrasekharan Nair , Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 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 Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Hi Will, On Wed, Jul 24, 2019 at 08:41:30AM +0100, Will Deacon wrote: > There aren't tonnes of (direct) users of the iommu-api, and the additional > complexity introduced by the 'struct iotlb_gather' only applies to users of > iommu_unmap_fast(), which I think is a reasonable trade-off in return for > the potential for improved performance. Yeah, that is right. From a scalability point of view this is much better and easier than keeping 'struct iotlb_gather' in the iommu_domain. Thanks for the explanation. Regards, Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu