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Wed, 29 Jan 2025 00:25:27 +0000 Received: from MW6PR10MB7660.namprd10.prod.outlook.com ([fe80::41fa:92d3:28b9:2a15]) by MW6PR10MB7660.namprd10.prod.outlook.com ([fe80::41fa:92d3:28b9:2a15%5]) with mapi id 15.20.8377.021; Wed, 29 Jan 2025 00:25:27 +0000 Message-ID: <92f188ed-4f47-427b-b8fd-2c0f76ef129b@oracle.com> Date: Tue, 28 Jan 2025 16:25:22 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/20] Add support for shared PTEs across processes To: Andrew Morton Cc: willy@infradead.org, markhemm@googlemail.com, viro@zeniv.linux.org.uk, david@redhat.com, khalid@kernel.org, jthoughton@google.com, corbet@lwn.net, dave.hansen@intel.com, kirill@shutemov.name, luto@kernel.org, brauner@kernel.org, arnd@arndb.de, ebiederm@xmission.com, catalin.marinas@arm.com, mingo@redhat.com, peterz@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, tglx@linutronix.de, cgroups@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhiramat@kernel.org, rostedt@goodmis.org, vasily.averin@linux.dev, xhao@linux.alibaba.com, pcc@google.com, neilb@suse.de, maz@kernel.org References: <20250124235454.84587-1-anthony.yznaga@oracle.com> <20250128161138.066f6c27d0d941609ba1c1c9@linux-foundation.org> Content-Language: en-US From: Anthony Yznaga In-Reply-To: <20250128161138.066f6c27d0d941609ba1c1c9@linux-foundation.org> Content-Type: text/plain; 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On x86_64, each page requires a PTE that >> is 8 bytes long which is very small compared to the 4K page >> size. > Dumb question: why aren't these applications using huge pages? > They often are using hugetlbfs but would also benefit from having page tables shared for other kinds of memory such as shmem, tmpfs or dax.