From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7F757CCF9E3 for ; Mon, 10 Nov 2025 12:18:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:In-Reply-To:Subject:Cc:To:From:Message-ID:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=oBxOc5qfBcOJZDqRmzm+wULwya9/QGtOyJO7/xhluLo=; b=ZnK4IbLO/35qlG+G86IqTm1Ccy en3ojGco8CYXPsHEhI3MxFUC4LUfRGQn/FyPaU6TqS1lJjcJJexVkATrC3hK7zhdXy/WUHk4j3gUR mTu/b2QwFAA7sRLtqt436h0xGBp9MHj1AvuOVdsOZF0BBb0cjK4IWk1IuvlSjT/Y5d+6zmD4639ed Adp1s9E0XiHKcgtdwLGf0jWbuKCZQ7VNYnRh3qdvZxMmCyJgifF1TJKU0DtPEu7xJtrZnW7YuGTaE am9+VeErBHSwhXYuEhKm4lD1owrCJamAYSFNvZcJGUyHrU+Aql9UqZTc1gww8ipCsmQfDzkTrIEIk LacD/gKg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vIQqd-00000005Oa7-2Udd; Mon, 10 Nov 2025 12:18:15 +0000 Received: from mail-pg1-x52e.google.com ([2607:f8b0:4864:20::52e]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vIQqZ-00000005OZg-1Nuv for linux-um@lists.infradead.org; Mon, 10 Nov 2025 12:18:13 +0000 Received: by mail-pg1-x52e.google.com with SMTP id 41be03b00d2f7-ba599137cf7so2182501a12.0 for ; Mon, 10 Nov 2025 04:18:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762777090; x=1763381890; darn=lists.infradead.org; h=mime-version:user-agent:references:in-reply-to:subject:cc:to:from :message-id:date:from:to:cc:subject:date:message-id:reply-to; bh=oBxOc5qfBcOJZDqRmzm+wULwya9/QGtOyJO7/xhluLo=; b=WBgmxhAKA8Mcg8stvJmBhj8qPbzIQp5NDhQJjHCXyKOixHBiiICXWQL6W9G7mLDaUv I6D6BUBpRLhVfahZh6A5pp4Ijr7WjJxac5lNphfI6+XH4zkNfLiRgfcxniFvWGyIrxb+ KEzCim87NQA34L4BQrWf+YobBresFSIiFFT7oCrrpr6ev/60AafswVIVdu/8ytu66oQh bES+Ed1Lok0dPCkIoWqqb+RPrWjd57so6iM644lqrnVDB5D5KtmD88gNPFCaj7mDaeX/ ukWFDa74iC0r5ddU6IoQYTHH8GWLwzDiGC6IreQ2htKCQ5mxAfEbjBeIZctZ0i/99v8Q aLbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762777090; x=1763381890; h=mime-version:user-agent:references:in-reply-to:subject:cc:to:from :message-id:date:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=oBxOc5qfBcOJZDqRmzm+wULwya9/QGtOyJO7/xhluLo=; b=l7Mse3fJiRmwZmqEwNipyu9LwSQhzfUwQAyZfgXngLGjujwcq0TSSx1sdSxjYgWqq4 kFNxm0XpqcpG29TQHyMW1tcaRMD9uvAOFE045PaWrv2jhlHxg7TpxgI1IFolAr7Pe6Pk wexM2oIlNHmi+zA5FUZHX4v36LRbRvtJhKe70q5BFW56z1uKJ6XYsoNx6RsYvFwtMGB1 vyzNw868daPx2mj1A6uEE3w9y0/sthya0jhLEX815B6yC+QMxXXiJ4ALiDFZMDmXNrSJ ssT2xqLyCdYxBsKsanfPAS5MNj8aOKqbKNFUbVPwaub8skCtR/GkTVWNuyJHvAsoVHXF aEVA== X-Gm-Message-State: AOJu0YwfHqTJDoIJ5Ez0hOpMNkqZzrz0MBHcdM+oKX2kWGfFqn7rF6+Z 1vk1ua8ztzvvPiGF6VJXAGGUzLgWBKsG6JezfjW6GeUrsMNx6m/GEiZJ X-Gm-Gg: ASbGncs8cGVR5zvOado5aYQYa82n5afYBSrVqW21OgmlmU8d1lDtsq6wFQIVAlolZCs 5ardN57pq/vWNh/nyKVBdkBVerxsYc1KFJ0rp0zPR32670JI6obdRxAhIsmTteQ6Q3fxy6J9c9X 1VYjLQfJ6qBN6e7r8w0x+o7mXpDygXB//0NpG6QGbo4qR6m0QPxIibiJLGzHJ0mtIvhrsJCzray KYR+2yR1xNV4IFTHIaSqeZggSOro2sZGf9gq4/esocIMwGOewMgmO2mSl0xY7oA5QMU3SyTFhWG fZ57v/Ustar8mlOOpKS6OfkFzwiraL0Q6fSp7LSgoD1/CikpuoVjQcSrmDaEgjHCvetahA1g3yq aWlis4oLz3/wYOp6Dg+Pgj7c18qLmsgUMbyf5PmdoD9DNcMIU2JiVeNs8j64saNumQX95jKCuF0 2xhsWUqQVyVyMoYRaartv3CE1yyGk+y+eHmhcwdyLRzhhHkDR+1pECmUOSOKj1s4T0T1OJcD2VB 64xWq4UF189zugd/fhwKw== X-Google-Smtp-Source: AGHT+IHHASQUV9QkdfBzJ80+YLK4VSdlwhzAh7FRSiwznuCW7X2R7SNuVB0qK7gA4LbbzwDOGQTcdA== X-Received: by 2002:a17:903:40cf:b0:296:ec5:ab3d with SMTP id d9443c01a7336-297e570a922mr108833405ad.61.1762777090029; Mon, 10 Nov 2025 04:18:10 -0800 (PST) Received: from mars.local.gmail.com (221x241x217x81.ap221.ftth.ucom.ne.jp. [221.241.217.81]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-296509682casm144137395ad.22.2025.11.10.04.18.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 04:18:09 -0800 (PST) Date: Mon, 10 Nov 2025 21:18:05 +0900 Message-ID: From: Hajime Tazaki To: hch@infradead.org Cc: linux-um@lists.infradead.org, ricarkol@google.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v13 00/13] nommu UML In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/26.3 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251110_041811_371021_B3FAAE9B X-CRM114-Status: GOOD ( 15.79 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org Hello, On Mon, 10 Nov 2025 18:14:26 +0900, Christoph Hellwig wrote: > > On Sat, Nov 08, 2025 at 05:05:35PM +0900, Hajime Tazaki wrote: > > This patchset is another spin of nommu mode addition to UML. It would > > be nice to hear about your opinions on that. > > I've not seen any explanation of the use case and/or benefits anywhere > in this cover letter or the patches. Without that it's usually pretty > hard to get maintainers and reviewers excited. thank you for the comment. I tried to include this explanation in the document patch [12/13], which I copied from the text below. What is it for ? ================ - Alleviate syscall hook overhead implemented with ptrace(2) - To exercises nommu code over UML (and over KUnit) - Less dependency to host facilities the first item is for speed up, the second item is for more testing, the last item is for more extensibility in the future. Early version of this patchset included this information as well as the whole documentation, but I removed it as the versions grow. But I can revert it to the cover letter if it helps. -- Hajime