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Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Subject: Re: [PATCH v2] mm: disable kernelcore=mirror when no mirror memory Content-Language: en-US To: Wupeng Ma , , CC: References: <20230802072328.2107981-1-mawupeng1@huawei.com> From: Kefeng Wang In-Reply-To: <20230802072328.2107981-1-mawupeng1@huawei.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm100001.china.huawei.com (7.185.36.93) X-CFilter-Loop: Reflected X-Rspamd-Queue-Id: 3BB0C80003 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: jurbg5wh3s3hbmpq9oy4fqwybwp585be X-HE-Tag: 1691031979-875451 X-HE-Meta: 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 oVx5MXjs 0CvajJYpANtIHQ2UbKIYJMMrO9UUfZ4XSSMeDuC/k2GP0bxao+O5F7NXDipKD3UNucpE1Sv36656cLCyOaJhFl+5MKCUVX0/2gRARjnmfoKBZMVadLoUHEqiMEa4FpYMHYyRzd+54BB0RaYcbxXEMtCaclcjR5LU5b+RSkaGB25NgS5/traN+NVNotw7wg9qGusE6OtlxWJ9GKr4od2efX18FgA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2023/8/2 15:23, Wupeng Ma wrote: > From: Ma Wupeng > > For system with kernelcore=mirror enabled while no mirrored memory is > reported by efi. This could lead to kernel OOM during startup since > all memory beside zone DMA are in the movable zone and this prevents > the kernel to use it. > > Zone DMA/DMA32 initialization is independent of mirrored memory and > their max pfn is set in zone_sizes_init(). Since kernel can fallback > to zone DMA/DMA32 if there is no memory in zone Normal, these zones > are seen as mirrored memory no mather their memory attributes are. > > To solve this problem, disable kernelcore=mirror when there is no real > mirrored memory exists. > > Suggested-by: Kefeng Wang > Suggested-by: Mike Rapoport > Signed-off-by: Ma Wupeng Reviewed-by: Kefeng Wang