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=-11.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 A5972C433FE for ; Wed, 9 Dec 2020 18:28:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A54D23C8F for ; Wed, 9 Dec 2020 18:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733067AbgLIS2Q (ORCPT ); Wed, 9 Dec 2020 13:28:16 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:9415 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733049AbgLIS17 (ORCPT ); Wed, 9 Dec 2020 13:27:59 -0500 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4Crlr04j05z7By3; Thu, 10 Dec 2020 02:26:40 +0800 (CST) Received: from localhost.localdomain (10.69.192.58) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.487.0; Thu, 10 Dec 2020 02:27:03 +0800 From: John Garry To: , CC: , , , , , John Garry Subject: [PATCH v4 0/3] iommu/iova: Solve longterm IOVA issue Date: Thu, 10 Dec 2020 02:23:06 +0800 Message-ID: <1607538189-237944-1-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.58] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series contains a patch to solve the longterm IOVA issue which leizhen originally tried to address at [0]. A sieved kernel log is at the following, showing periodic dumps of IOVA sizes, per CPU and per depot bin, per IOVA size granule: https://raw.githubusercontent.com/hisilicon/kernel-dev/topic-iommu-5.10-iova-debug-v3/aging_test Notice, for example, the following logs: [13175.355584] print_iova1 cpu_total=40135 depot_total=3866 total=44001 [83483.457858] print_iova1 cpu_total=62532 depot_total=24476 total=87008 Where total IOVA rcache size has grown from 44K->87K over a long time. Along with this patch, I included the following: - A smaller helper to clear all IOVAs for a domain - Change polarity of the IOVA magazine helpers Differences to v3: - Drop Cong's patch, already accepted - Add tags - Rebased Differnces to v2: - Update commit message for patch 3/4 Differences to v1: - Add IOVA clearing helper - Add patch to change polarity of mag helpers - Avoid logically-redundant extra variable in __iova_rcache_insert() [0] https://lore.kernel.org/linux-iommu/20190815121104.29140-3-thunder.leizhen@huawei.com/ [1] https://lore.kernel.org/linux-iommu/4b74d40a-22d1-af53-fcb6-5d70183705a8@huawei.com/ John Garry (3): iommu/iova: Add free_all_cpu_cached_iovas() iommu/iova: Avoid double-negatives in magazine helpers iommu/iova: Flush CPU rcache for when a depot fills drivers/iommu/iova.c | 58 ++++++++++++++++++++++++-------------------- 1 file changed, 32 insertions(+), 26 deletions(-) -- 2.26.2