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Thu, 10 Jun 2021 21:49:21 +0000 Received: from BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::5d11:ae6d:24b6:e838]) by BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::5d11:ae6d:24b6:e838%3]) with mapi id 15.20.4219.023; Thu, 10 Jun 2021 21:49:21 +0000 Subject: Re: [PATCH 1/5] mm: hugetlb: introduce helpers to preallocate/free page tables To: Muchun Song , akpm@linux-foundation.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, chenhuang5@huawei.com, bodeddub@amazon.com, corbet@lwn.net Cc: duanxiongchun@bytedance.com, fam.zheng@bytedance.com, zhengqi.arch@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20210609121310.62229-1-songmuchun@bytedance.com> <20210609121310.62229-2-songmuchun@bytedance.com> From: Mike Kravetz Message-ID: <1db48b66-8b99-ab4d-4b15-b4dcb7084e8d@oracle.com> Date: Thu, 10 Jun 2021 14:49:19 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 In-Reply-To: <20210609121310.62229-2-songmuchun@bytedance.com> Content-Type: text/plain; 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dkim=pass header.d=oracle.com header.s=corp-2020-01-29 header.b=SccqZzFd; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=XZOUXcGI; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf05.hostedemail.com: domain of mike.kravetz@oracle.com has no SPF policy when checking 216.40.41.5) smtp.mailfrom=mike.kravetz@oracle.com X-HE-Tag: 1623362269-501055 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 6/9/21 5:13 AM, Muchun Song wrote: > On some architectures (e.g. x86_64 and arm64), vmemmap pages are usually > mapped with huge pmd. We will disable the huge pmd mapping of vmemmap > pages when the feature of "Free vmemmap pages of HugeTLB page" is enabled. > This can affect the non-HugeTLB pages. What we want is only mapping the > vmemmap pages associated with HugeTLB pages with base page. We can split > the huge pmd mapping of vmemmap pages when freeing vmemmap pages of > HugeTLB page. But we need to preallocate page tables. In this patch, we > introduce page tables allocationg/freeing helpers. > > Signed-off-by: Muchun Song > --- > mm/hugetlb_vmemmap.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++ > mm/hugetlb_vmemmap.h | 12 ++++++++++++ > 2 files changed, 66 insertions(+) These helper routines are pretty straight forward. Reviewed-by: Mike Kravetz -- Mike Kravetz