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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE2C7CCA47B for ; Mon, 11 Jul 2022 09:04:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229808AbiGKJEs (ORCPT ); Mon, 11 Jul 2022 05:04:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229501AbiGKJEr (ORCPT ); Mon, 11 Jul 2022 05:04:47 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 56D01C36; Mon, 11 Jul 2022 02:04:46 -0700 (PDT) Received: from dggpemm500020.china.huawei.com (unknown [172.30.72.55]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4LhHvQ09VNz1L926; Mon, 11 Jul 2022 17:02:10 +0800 (CST) Received: from dggpemm500006.china.huawei.com (7.185.36.236) by dggpemm500020.china.huawei.com (7.185.36.49) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 11 Jul 2022 17:04:41 +0800 Received: from thunder-town.china.huawei.com (10.174.178.55) by dggpemm500006.china.huawei.com (7.185.36.236) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 11 Jul 2022 17:04:41 +0800 From: Zhen Lei To: Dave Young , Baoquan He , Vivek Goyal , , , Catalin Marinas , Will Deacon , , Jonathan Corbet , CC: Zhen Lei , "Eric W . Biederman" , Randy Dunlap , Feng Zhou , Kefeng Wang , "Chen Zhou" , John Donnelly , Dave Kleikamp Subject: [PATCH v3 0/2] arm64: kdump: Function supplement and performance optimization Date: Mon, 11 Jul 2022 17:03:17 +0800 Message-ID: <20220711090319.1604-1-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.26.0.windows.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.174.178.55] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm500006.china.huawei.com (7.185.36.236) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org v2 --> v3: 1. Discard patch 3 in v2, a cleanup patch. v1 --> v2: 1. Update the commit message of Patch 1, explicitly indicates that "crashkernel=X,high" is specified but "crashkernel=Y,low" is not specified. 2. Drop Patch 4-5. Currently, focus on function integrity, performance optimization will be considered in later versions. 3. Patch 3 is not mandatory, it's just a cleanup now, although it is a must for patch 4-5. But to avoid subsequent duplication of effort, I'm glad it was accepted. v1: After the basic functions of "support reserving crashkernel above 4G on arm64 kdump"(see https://lkml.org/lkml/2022/5/6/428) are implemented, we still have three features to be improved. 1. When crashkernel=X,high is specified but crashkernel=Y,low is not specified, the default crash low memory size is provided. 2. For crashkernel=X without '@offset', if the low memory fails to be allocated, fall back to reserve region from high memory(above DMA zones). 3. If crashkernel=X,high is used, page mapping is performed only for the crash high memory, and block mapping is still used for other linear address spaces. Compared to the previous version: (1) For crashkernel=X[@offset], the memory above 4G is not changed to block mapping, leave it to the next time. (2) The implementation method is modified. Now the implementation is simpler and clearer. Zhen Lei (2): arm64: kdump: Provide default size when crashkernel=Y,low is not specified arm64: kdump: Support crashkernel=X fall back to reserve region above DMA zones .../admin-guide/kernel-parameters.txt | 10 ++----- arch/arm64/mm/init.c | 28 +++++++++++++++++-- 2 files changed, 28 insertions(+), 10 deletions(-) -- 2.25.1