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X-IronPort-AV: E=McAfee;i="6600,9927,10969"; a="10811438" X-IronPort-AV: E=Sophos;i="6.05,230,1701158400"; d="scan'208";a="10811438" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jan 2024 15:36:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,230,1701158400"; d="scan'208";a="3885863" Received: from mustafab-mobl.amr.corp.intel.com (HELO [10.209.90.220]) ([10.209.90.220]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jan 2024 15:36:41 -0800 Message-ID: Date: Tue, 30 Jan 2024 15:36:40 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 02/12] mm: add config option and per-NUMA node VMS support Content-Language: en-US To: Artem Kuzin , "Christoph Lameter (Ampere)" Cc: x86@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, luto@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com, mcgrof@kernel.org, rmk+kernel@armlinux.org.uk, nikita.panov@huawei-partners.com, alexander.grubnikov@huawei.com, stepanov.anatoly@huawei.com, guohanjun@huawei.com, weiyongjun1@huawei.com, wangkefeng.wang@huawei.com, judy.chenhui@huawei.com, yusongping@huawei.com, kang.sun@huawei.com, linux-mm@kvack.org, linux-modules@vger.kernel.org References: <20231228131056.602411-1-artem.kuzin@huawei.com> <20231228131056.602411-3-artem.kuzin@huawei.com> <059dc132-af10-fd08-7368-302c765a4269@gentwo.org> <6c5c72ab-01b1-45b4-9a33-529688e449eb@intel.com> <5a7485f8-a070-465d-9e17-e7cd3d2aaa80@huawei.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: BD43B180015 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 8duhxuijexi7ubgwbzdaf8nqrfp15bf1 X-HE-Tag: 1706657805-533146 X-HE-Meta: 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 7jf77Z3W yt0+Icu05VhcSfCuDo7aETEYhBJATUQ4GXL1Nq+dlqSwIW8MbXjmEg28yXcGltdMePDO3T5q0yLBtgTPi+XXM34/RmsvJnyOlR/6D0KgCs59X1QMhotobD5Amhm+hRw1XsFzbNhXBFQW43V78g3g9fPlzesmorOYehOzZjuL6vZgLg2vboSUZC9sPsxoNqIU2VseOGwg3Et6KqEDsVAbfKgGzWAZZHZjZDmBCKGkgktF8dVoIkihQ3DG1q1vZowFn3jPl 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: List-Subscribe: List-Unsubscribe: On 1/28/24 22:22, Artem Kuzin wrote: > As for possible options, for now I am thinking about two: > 1. additional config option to limit the number of page tables and corresponding replicas This doesn't help. Everybody runs distro kernels with the same configs with MAX_NUMNODES set to 1024. > 2. setup per-NUMA node page tables and replicas in a lazy way allocating them on demand ... and probably shrinking them on demand too (or at least limiting their growth). You don't want to have a random long-lived process that's migrated to 50 different nodes having 50 different PGD pages when it can only use one at a time.