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rv:102.0) Gecko/20100101 Thunderbird/102.1.2 From: Ryan Roberts Subject: Re: [PATCH v7 4/4] KVM: arm64/mmu: count KVM s2 mmu usage in secondary pagetable stats To: Yosry Ahmed , Tejun Heo , Johannes Weiner , Zefan Li , Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Andrew Morton , Michal Hocko , Roman Gushchin , Shakeel Butt , Oliver Upton Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Huang@google.com, Shaoqin , linux-mm@kvack.org, cgroups@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, nd@arm.com References: <20220823004639.2387269-1-yosryahmed@google.com> <20220823004639.2387269-5-yosryahmed@google.com> Content-Language: en-US In-Reply-To: <20220823004639.2387269-5-yosryahmed@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO4P123CA0090.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:190::23) To AS8PR08MB6995.eurprd08.prod.outlook.com (2603:10a6:20b:34d::13) MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 79dda629-a41e-4e6f-7d49-08da85d6b263 X-MS-TrafficTypeDiagnostic: AS8PR08MB8371:EE_|DBAEUR03FT063:EE_|AS8PR08MB8157:EE_ x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=gN3riQNW; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=gN3riQNW; arc=pass ("microsoft.com:s=arcselector9901:i=2"); spf=pass (imf09.hostedemail.com: domain of Ryan.Roberts@arm.com designates 40.107.15.48 as permitted sender) smtp.mailfrom=Ryan.Roberts@arm.com; dmarc=pass (policy=none) header.from=arm.com X-HE-Tag: 1661348642-813541 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: > Count the pages used by KVM in arm64 for stage2 mmu in memory stats > under secondary pagetable stats (e.g. "SecPageTables" in /proc/meminfo) > to give better visibility into the memory consumption of KVM mmu in a > similar way to how normal user page tables are accounted. > > Signed-off-by: Yosry Ahmed > Reviewed-by: Oliver Upton > Reviewed-by: Marc Zyngier > --- I see that you are not including the memory reserved for the host stage2 table when using protected KVM. Is this something worth adding? (See arch/arm64/kvm/pkvm.c:kvm_hyp_reserve()). This reservation is done pretty early on in bootmem_init() so not sure if this could cause some init ordering issues that might be tricky to solve though. Thanks, Ryan