From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 3C9561DF982 for ; Mon, 11 Aug 2025 10:21:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754907694; cv=none; b=cv9AKSkNJ8PQR+fYjmrQ2cwDXs+7DQEnj6gvDCmUBjxu9MvqN7Cx4BTC3cXKi3uq2cDdUp+gW0ku01Qx1QBohArfwSs60rySAlz6Qm7p37NUtUWnrCVUllWfTRCsZpvZW4lpMhkoG36j4++EvUH4umldNmhIbEq9BEjqgdwPqoc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754907694; c=relaxed/simple; bh=ayqtFmkixjwDnTODx7shUTJ/SJAbYwLdJtISrLlnuaA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HAeo2NPGM9ymLY2B60zARbGtCvWD2bjwEnTI9sfSvBuedjGec/0ib5iIovxA3dLGhxTq88rDQEPCEtcf4i3IFUlp+rG+NB7yZQTguqzNEIVx182GEhtNplZ9Xd2rEIQ8UUSkmEZpzQi9hbUOUenggzJE3OBNXmS4j5b0bifaHmY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=W68o7ghb; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="W68o7ghb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754907692; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=LH3iRZK7IeDS4TzLmHxpdhHsh5vYYAvHRC+uGiYwcF0=; b=W68o7ghbQEWRA4oblSr/KJW/UHS78B2odqWVmlk6H94Er1B/Tq/mzkBBRXr3Xhv1SMwbIQ lEQGoG6bOZeFT3ftQxRxp5kGDnBgq6W5dq/v+lZYO8l5MwXzjYrhkX1jlaxW4wcIDLxMgT XygXPCOWojzZk5iU43klbro19uJtges= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-592-o0KUVA-sOqG32gBNQCayfw-1; Mon, 11 Aug 2025 06:21:30 -0400 X-MC-Unique: o0KUVA-sOqG32gBNQCayfw-1 X-Mimecast-MFC-AGG-ID: o0KUVA-sOqG32gBNQCayfw_1754907690 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-3b788e2581bso2010754f8f.0 for ; Mon, 11 Aug 2025 03:21:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754907689; x=1755512489; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=LH3iRZK7IeDS4TzLmHxpdhHsh5vYYAvHRC+uGiYwcF0=; b=ehkWzONbFGK625Mx0kVGvGhbUpZBwhJ5gvbaybfejrLxq2q1mDsWPHUB8NcaIkJeoY cghbKY7+qNALi9a/lhBuMoFFC8vrFPauD4r0osj3/SKCJrCg6xbNjfkoB51ChYlHkWsW n1z7dUDtSGqzL8o2yd+oBrJKSLMYa4heOwhGocwvniBQAvHpgFiJEm1BAGluYL454abb fySCnHFYb1kG9P3jYMFHhyYaWi3Wt2kJXLeCdnP8AST2MI1Q22D4rFjTb28+SPMy4Wa/ XmjkjI7B9zE7LaIl3+j4TCct/wvNUxcxYRksXz6JlFd0KaO18SKIpR6rxpYRuzKALNIY 3GHQ== X-Forwarded-Encrypted: i=1; AJvYcCUJ+1/rEZu6QMm6ytBgaiZt+h6lh7uopFGV+23JPxB6oSa3dsEnnCe289HsKHDp1HtilENLceTRMuWaXA==@vger.kernel.org X-Gm-Message-State: AOJu0YzrHZkJwaHHxkmdsaNMZ2UmvAdirQqBeoTVdGPsXrhhLH08vkxc GHZ+7YzjRPuG1078eIO6es9CLbPTMX6xUfGLu5/bHpNpIgiWw6/z0MuV8GkJxEZlxrXCd/IXwNT CpOxQeyzQ54VIy8IkuBS9xF29UK9Z7IU7H8J+qs4wh4WO9XcAYCTR/26bTNWSYFxV X-Gm-Gg: ASbGncvKYJK6dAJIs4I40FZKqz0UtgxLYrVlxyOh54gPGd9zsDQ3MhoQwXITZD8hpiu stGAwLq+3NoW6JlE+1BFqPb8Ri6I8IyiOXahnkIRfjaYy2Blkl9mWouXYwfruEOaE9MevudNUkl Q3CF4phsWwrKiZhhG0SPBOXCFth5vGixQvJ5pA3uZbfgaGqEyoCqxM1VqsWHEdpf+vBdGW5ugAt 2+b6XwH9msC6wnsW3zwF0qxLoCR5JXyzPG9U/bJQpMAM17lRrsutmqCciWi4dPRDwp4KoNVUWA0 mxstVkzXgb9T+acwPRnWA3Mj4cSZ/Cyu3XtjstpJlKsIcFnxLs39DHFHms7jcw/wPgceeK5pZJK HBQ5OQJu0vlMxYTTSjRHsVlSrchkBIh8Edha80V49QPKba6jIa98xY3duRUxVN0MZRgg= X-Received: by 2002:a05:6000:4383:b0:3b8:f887:c870 with SMTP id ffacd0b85a97d-3b900b3243dmr9367043f8f.19.1754907689608; Mon, 11 Aug 2025 03:21:29 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFe9BiKofT8pklvpbhpv0YQsdaHNqXbde6OX7E3hrFNquhTSOBxDSVsC4PHUt1yybczkNcsvQ== X-Received: by 2002:a05:6000:4383:b0:3b8:f887:c870 with SMTP id ffacd0b85a97d-3b900b3243dmr9367002f8f.19.1754907688990; Mon, 11 Aug 2025 03:21:28 -0700 (PDT) Received: from ?IPV6:2003:d8:2f06:a600:a397:de1d:2f8b:b66f? (p200300d82f06a600a397de1d2f8bb66f.dip0.t-ipconnect.de. [2003:d8:2f06:a600:a397:de1d:2f8b:b66f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-459c58ed07fsm345483105e9.22.2025.08.11.03.21.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Aug 2025 03:21:26 -0700 (PDT) Message-ID: <57bec266-97c4-4292-bd81-93baca737a3c@redhat.com> Date: Mon, 11 Aug 2025 12:21:23 +0200 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/5] add persistent huge zero folio support To: Kiryl Shutsemau , Lorenzo Stoakes Cc: "Pankaj Raghav (Samsung)" , Suren Baghdasaryan , Ryan Roberts , Baolin Wang , Vlastimil Babka , Zi Yan , Mike Rapoport , Dave Hansen , Michal Hocko , Andrew Morton , Thomas Gleixner , Nico Pache , Dev Jain , "Liam R . Howlett" , Jens Axboe , linux-kernel@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org, Ritesh Harjani , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Darrick J . Wong" , mcgrof@kernel.org, gost.dev@samsung.com, hch@lst.de, Pankaj Raghav References: <20250811084113.647267-1-kernel@pankajraghav.com> <112b4bcd-230a-4482-ae2e-67fa22b3596f@redhat.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11.08.25 12:17, Kiryl Shutsemau wrote: > On Mon, Aug 11, 2025 at 11:09:24AM +0100, Lorenzo Stoakes wrote: >> On Mon, Aug 11, 2025 at 11:07:48AM +0100, Kiryl Shutsemau wrote: >>> >>> Well, my worry is that 2M can be a high tax for smaller machines. >>> Compile-time might be cleaner, but it has downsides. >>> >>> It is also not clear if these users actually need physical HZP or virtual >>> is enough. Virtual is cheap. >> >> The kernel config flag (default =N) literally says don't use unless you >> have plenty of memory :) >> >> So this isn't an issue. > > Distros use one-config-fits-all approach. Default N doesn't help > anything. You'd probably want a way to say "use the persistent huge zero folio if you machine has more than X Gigs". That's all reasonable stuff that can be had on top of this series. -- Cheers, David / dhildenb