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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 AB98CC433E0 for ; Thu, 18 Jun 2020 02:48:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 89F962083B for ; Thu, 18 Jun 2020 02:48:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592448494; bh=VJzaoxoKeF198IG1//NwSmmQ60SybCGGZhxLajDECV0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KLrkA/KJJgiQl8SRomVd4ehJWwY6X4R5/J9HbqXYEVs73cTN53vR+tRzb/COpLPht rcXw0pbOk5xzQ1sWNN1hg28gTGbGFHe12pkLKuJmHPY/d/9D28F/eFHj1hGBWKj4Er gt5AdDOIf91i837S8N5JiVxQA8rZZC1XmFcxfebU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728396AbgFRBKG (ORCPT ); Wed, 17 Jun 2020 21:10:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:36840 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728353AbgFRBKA (ORCPT ); Wed, 17 Jun 2020 21:10:00 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 95E8121D7B; Thu, 18 Jun 2020 01:09:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592442599; bh=VJzaoxoKeF198IG1//NwSmmQ60SybCGGZhxLajDECV0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SU6twZ204jAf9EgOktPU+BISYzMll3te/oVa+xwHk/s5UJxc/JLidt7wyTs77icKS EDN/piwTUdcgLXOYQE+BcWGWDWbohsVIrBTUhlCxGgeudtc6LNqsgkTmOUjOaJPbUT itmfmUJsKrn1mc5JlyqvNMD6XX5ZvFQFPGoTfJng= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pingfan Liu , Hari Bathini , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.7 086/388] powerpc/crashkernel: Take "mem=" option into account Date: Wed, 17 Jun 2020 21:03:03 -0400 Message-Id: <20200618010805.600873-86-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618010805.600873-1-sashal@kernel.org> References: <20200618010805.600873-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pingfan Liu [ Upstream commit be5470e0c285a68dc3afdea965032f5ddc8269d7 ] 'mem=" option is an easy way to put high pressure on memory during some test. Hence after applying the memory limit, instead of total mem, the actual usable memory should be considered when reserving mem for crashkernel. Otherwise the boot up may experience OOM issue. E.g. it would reserve 4G prior to the change and 512M afterward, if passing crashkernel="2G-4G:384M,4G-16G:512M,16G-64G:1G,64G-128G:2G,128G-:4G", and mem=5G on a 256G machine. This issue is powerpc specific because it puts higher priority on fadump and kdump reservation than on "mem=". Referring the following code: if (fadump_reserve_mem() == 0) reserve_crashkernel(); ... /* Ensure that total memory size is page-aligned. */ limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE); memblock_enforce_memory_limit(limit); While on other arches, the effect of "mem=" takes a higher priority and pass through memblock_phys_mem_size() before calling reserve_crashkernel(). Signed-off-by: Pingfan Liu Reviewed-by: Hari Bathini Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/1585749644-4148-1-git-send-email-kernelfans@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/kexec/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kexec/core.c b/arch/powerpc/kexec/core.c index 078fe3d76feb..56da5eb2b923 100644 --- a/arch/powerpc/kexec/core.c +++ b/arch/powerpc/kexec/core.c @@ -115,11 +115,12 @@ void machine_kexec(struct kimage *image) void __init reserve_crashkernel(void) { - unsigned long long crash_size, crash_base; + unsigned long long crash_size, crash_base, total_mem_sz; int ret; + total_mem_sz = memory_limit ? memory_limit : memblock_phys_mem_size(); /* use common parsing */ - ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), + ret = parse_crashkernel(boot_command_line, total_mem_sz, &crash_size, &crash_base); if (ret == 0 && crash_size > 0) { crashk_res.start = crash_base; @@ -178,6 +179,7 @@ void __init reserve_crashkernel(void) /* Crash kernel trumps memory limit */ if (memory_limit && memory_limit <= crashk_res.end) { memory_limit = crashk_res.end + 1; + total_mem_sz = memory_limit; printk("Adjusted memory limit for crashkernel, now 0x%llx\n", memory_limit); } @@ -186,7 +188,7 @@ void __init reserve_crashkernel(void) "for crashkernel (System RAM: %ldMB)\n", (unsigned long)(crash_size >> 20), (unsigned long)(crashk_res.start >> 20), - (unsigned long)(memblock_phys_mem_size() >> 20)); + (unsigned long)(total_mem_sz >> 20)); if (!memblock_is_region_memory(crashk_res.start, crash_size) || memblock_reserve(crashk_res.start, crash_size)) { -- 2.25.1