From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F5D07FD; Wed, 29 Jan 2025 00:11:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738109501; cv=none; b=rmsMAd2k1xDvDYonmoqcgeYrlfHwDfzlvQqO8BlqGYiUqcgXD/xqZANeqEIVE6TYO8L/rx5BoH1u2ZlDbq2fWuQFa/bXua4nvx65EzOq2ThsqDhc7vvMAyCMrZR8hkmhVUtTg3jOBhHPd3Uv8TweUhd2AGmcxl39NFCiINx1tqI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738109501; c=relaxed/simple; bh=oDL9bu5A99PSXDQzASaWVbm7QZ7H2YnOppQ3GGIXNSc=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=b17Jn3UKO9QSSmtSAOdi2lgR+FKV1lavPD5zYr7QWie6R6zVSnhdtxWMiGZf4SBcdtd5AyKc33uGzIdfJDbSB8Kv75o1zAggmoab5Jr0AFbCl7hXTdbt225CCtQorBsIgoPq2gcMOo9Tmkqo3+eV23L745VDpMbB4d4fyrjgroA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=T4h6CXYH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="T4h6CXYH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82739C4CED3; Wed, 29 Jan 2025 00:11:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1738109500; bh=oDL9bu5A99PSXDQzASaWVbm7QZ7H2YnOppQ3GGIXNSc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=T4h6CXYHlUCtKc2p3wto5pCh3/b8fItepEGM7fmiS11/zZMl287R7zDRts/GeSoQ8 On7MVAvE5mIqAvtrVG36tfLSOde9QRu0+qWJbjnrPcCES5BotvSxWLbEdSLb4x+UyK tcRgyCjLjxhCAhZAdeNSkJRrXNHi2VrxFH22fIvk= Date: Tue, 28 Jan 2025 16:11:38 -0800 From: Andrew Morton To: Anthony Yznaga 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 Subject: Re: [PATCH 00/20] Add support for shared PTEs across processes Message-Id: <20250128161138.066f6c27d0d941609ba1c1c9@linux-foundation.org> In-Reply-To: <20250124235454.84587-1-anthony.yznaga@oracle.com> References: <20250124235454.84587-1-anthony.yznaga@oracle.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 24 Jan 2025 15:54:34 -0800 Anthony Yznaga wrote: > Some of the field deployments commonly see memory pages shared > across 1000s of processes. 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?