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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F3B0C87FDB for ; Mon, 11 Aug 2025 10:36:40 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 118058E0035; Mon, 11 Aug 2025 06:36:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0C91C8E000A; Mon, 11 Aug 2025 06:36:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EF9E38E0035; Mon, 11 Aug 2025 06:36:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id E080D8E000A for ; Mon, 11 Aug 2025 06:36:39 -0400 (EDT) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 94027116B32 for ; Mon, 11 Aug 2025 10:36:39 +0000 (UTC) X-FDA: 83764122918.05.3FC28DC Received: from flow-b8-smtp.messagingengine.com (flow-b8-smtp.messagingengine.com [202.12.124.143]) by imf20.hostedemail.com (Postfix) with ESMTP id 947671C0006 for ; Mon, 11 Aug 2025 10:36:36 +0000 (UTC) Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=shutemov.name header.s=fm1 header.b="Z YwJzj3"; dkim=pass header.d=messagingengine.com header.s=fm3 header.b="lw/u2PNS"; dmarc=none; spf=pass (imf20.hostedemail.com: domain of kirill@shutemov.name designates 202.12.124.143 as permitted sender) smtp.mailfrom=kirill@shutemov.name ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1754908596; a=rsa-sha256; cv=none; b=wOowmGW22lGHaILPllikWh804ibWvBQ90J99VYjlZ9HMfYTtgUtq38PXs3JuKq15YmBYST HLb1i30yGLIxoBlG7ECDyDQbzmWdfyd0c3QILW3V6qxXDIuQ/mjZaVCzK97WmDtdzVHskl 27WxZqH5m8tFbSue0zduiV2kjJOTP1E= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=pass header.d=shutemov.name header.s=fm1 header.b="Z YwJzj3"; dkim=pass header.d=messagingengine.com header.s=fm3 header.b="lw/u2PNS"; dmarc=none; spf=pass (imf20.hostedemail.com: domain of kirill@shutemov.name designates 202.12.124.143 as permitted sender) smtp.mailfrom=kirill@shutemov.name ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1754908596; h=from:from:sender: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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=3ir52tZmodooRvQScQwDhVxAmA5y/JQn5auuY4m6agI=; b=0qccERkZ4PgX7iCZWoaJ7SKEsl2HmiN9S+uhxhq6Cfw3z7Lz9vjzf5YSmXMBJdrYC941Ob sT+zr0a2EYeU09dTu3Lv3jugOoIZDV8iXzDOwEvCbfNI9MQhcIU1bVnUtvSCpcGvGuAR3J 3p70UGPb23EaqnnVPFgFdFW7VTBM8NU= Received: from phl-compute-07.internal (phl-compute-07.internal [10.202.2.47]) by mailflow.stl.internal (Postfix) with ESMTP id 63CD11300191; Mon, 11 Aug 2025 06:36:34 -0400 (EDT) Received: from phl-mailfrontend-02 ([10.202.2.163]) by phl-compute-07.internal (MEProxy); Mon, 11 Aug 2025 06:36:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov.name; h=cc:cc:content-type:content-type:date:date:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=fm1; t=1754908594; x= 1754915794; bh=3ir52tZmodooRvQScQwDhVxAmA5y/JQn5auuY4m6agI=; b=Z YwJzj33xYsZBUJ6IzJ0WxB7ZPZ+NTd64XV3Jz1dl2fvYAxNzZqiEtfHmMBJ2dEjF jKsaTTRFIar75JV/WXJ7sAat2l3PPKC7Ypb/SFtLg97g2ylkT6Q+AwUTyeH3ytyW C5+k5l+T8OXQiTCGWyRj1cpraEq+jwmJ+lUEucZq8BAleJMuubOB1FeqeZL+9Oem 7w4b1iN3mORNUKRRBHFjl839Zr8Q/X/Trze38YmDdAU5FrnwNOuQqUfX8JKr6vtF C29Z8eIEgAOZTIT6E0KsP/cEi/l6pYvchnrlf8pnCE1zyAM1RSmkM135KlCcEN0O UI9DCOz2+1AhB+gIcoisw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:content-type:date:date :feedback-id:feedback-id:from:from:in-reply-to:in-reply-to :message-id:mime-version:references:reply-to:subject:subject:to :to:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm3; t= 1754908594; x=1754915794; bh=3ir52tZmodooRvQScQwDhVxAmA5y/JQn5au uY4m6agI=; b=lw/u2PNSpIOo4ODXYLXgQDAIDVQVNJ3cuT/pt2oak+p6hymj6Xl TRKUQgcUrq/GPM7Q8mKax6iMD4p1MBQDa/v4DrS/c+Fte3wWPNbeSfqzYKHuJgol Vwr+9t45ICKWovIldVz7rHak7NsrkLjyGvhCvcX6UAZ0KSSBEIFk2EygetByQcg7 kxzQaz+n+OmC1EyGVb9naUnnPfv5JgkXkbno7qbAvbDUbwYObdc5iT0kGjcv084a vlnQjymLIS//aiGkw3A/tGIVKtX4eQI9FHXB5SaFl1E0NnTOJS7QlJ0KpbKUnold Rv4D4LR5w9WAOpQvYYCiTZ5IueMmz/serGg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdefgddufedvvdefucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhepfffhvfevuffkfhggtggujgesthdtsfdttddtvdenucfhrhhomhepmfhirhihlhcu ufhhuhhtshgvmhgruhcuoehkihhrihhllhesshhhuhhtvghmohhvrdhnrghmvgeqnecugg ftrfgrthhtvghrnhepjeehueefuddvgfejkeeivdejvdegjefgfeeiteevfffhtddvtdel udfhfeefffdunecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrh homhepkhhirhhilhhlsehshhhuthgvmhhovhdrnhgrmhgvpdhnsggprhgtphhtthhopeeh iedpmhhouggvpehsmhhtphhouhhtpdhrtghpthhtohepuggrvhhiugesrhgvughhrghtrd gtohhmpdhrtghpthhtoheplhhorhgvnhiiohdrshhtohgrkhgvshesohhrrggtlhgvrdgt ohhmpdhrtghpthhtohepkhgvrhhnvghlsehprghnkhgrjhhrrghghhgrvhdrtghomhdprh gtphhtthhopehsuhhrvghnsgesghhoohhglhgvrdgtohhmpdhrtghpthhtoheprhihrghn rdhrohgsvghrthhssegrrhhmrdgtohhmpdhrtghpthhtohepsggrohhlihhnrdifrghngh eslhhinhhugidrrghlihgsrggsrgdrtghomhdprhgtphhtthhopehvsggrsghkrgesshhu shgvrdgtiidprhgtphhtthhopeiiihihsehnvhhiughirgdrtghomhdprhgtphhtthhope hrphhptheskhgvrhhnvghlrdhorhhg X-ME-Proxy: Feedback-ID: ie3994620:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 11 Aug 2025 06:36:31 -0400 (EDT) Date: Mon, 11 Aug 2025 11:36:29 +0100 From: Kiryl Shutsemau To: David Hildenbrand Cc: Lorenzo Stoakes , "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 Subject: Re: [PATCH v3 0/5] add persistent huge zero folio support Message-ID: References: <20250811084113.647267-1-kernel@pankajraghav.com> <112b4bcd-230a-4482-ae2e-67fa22b3596f@redhat.com> <57bec266-97c4-4292-bd81-93baca737a3c@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <57bec266-97c4-4292-bd81-93baca737a3c@redhat.com> X-Stat-Signature: bxp1eehxqaykyikaehycu1utkgof7b1a X-Rspam-User: X-Rspamd-Queue-Id: 947671C0006 X-Rspamd-Server: rspam02 X-HE-Tag: 1754908596-842199 X-HE-Meta: U2FsdGVkX18/6v7bnq0Xkk2TIijEDKx+eOcL1AYWqG8UpXV0fvoqxx9ajj59JwFpnXwJOhItQezS15sP9lXOrku4Vk4gQrEWdkhAFelhKq5ENBbdzXAxNb9L9Pyb7uN6KKxVmYrOPrquGZMAsXL6WbHRhxITJUtTIaVXtACqsAaHUFDTsHfWhTFAXMiB2Wi+yf3BO8eZMpxKeI6azGbvRlKZzVWkQWl+mDanJlG8BrqdpnCNAS7DjqliOod4L1/ZYGAj9gVzKbJiDAE1dhi7sBk7dGvwC23qBpdbq5PCHlLY8yoi4CUhqnQAGsCBo5hMwtg3OtWCA8UcjTpA63czT8IMb7s61KjwPqCnP9TTMS10Hn2g2vsXia9IV232mN5AdSSZf9WoJsoB5v1mpo3jYXv+fW7iOHmKFHzyIUWo+z0O4qd7rSvRrjjz94wlSzavgWEf8qwCUSz1p87lUa3cDHdkArBeL8Cwigy8y65Bz23Yr0fZPBH05f0q59IRyoctDFRJlYmHsve+OQSG/Qx22ttmwIsXg1zdeMbAp5qCDdhUfYCZYhtY6mIo5zhZAtTtR3vmPFBsP40vmI5fNv0wBum4P5wkAzTfY704W1P54JgsiZ/8LnZV0Z5oM2EBqlvra35UCWkLXoOcB8kiaa9YSrOviRDR4hhxGjQTvniRd5yFoL3tri846JScUTkGwmqZhckA3kRqIePFU8oxCVrOE+cNc7rRq22hJdHrRYqR5opEamN/UcXBRrXkOKfmTHDaYxy7SaKDZ1yQU2uh5BySv36OrgqSNtylGe1ZjZOj6Wc7msMeCl48jjTrqUQEEXUW0fsU5/SxB4OdMxIsw1TnZt354f8asRqrYqZMh4fMMozPsIrNAzAYre3gEiucdnJcRCotpqm9ohNYYlPjyCIrK37pj3yjYXgSfqcWvv3mDdp+Ds4fvfFsXxmg01INSUJqONrJrnuZiWJAne8ryPT MYXmN7I7 FpiItektWFUf3xu5FSBilikJqYGUm3TTjb3DVuZ+hJEb3uTjYSn9vIBhYcO39hyU5A4tWeeO3Ioz6Prcc40Ei/eInBNP7nrfIG+DefwJhVqb3pUjXZmdDiGw15+JmcPyhWEQU602BdqR4Pw7OEIghGNFfJkKYaE2C4G3cP3T7SoPGsgH1IGyk/Vv05y4VXZuW0Nt/eH5X6jLhbUIJDxoxJH+cPeAhpl+20Dn468PozqYRopkAEZEQ32zdRGIQvCXmZbdYz/DLPQ+ROoicqyqOMG+52+PYWPLgE0GinN77wsnYIsb3anwz6J7o4HbI57IXOhVbtaR2620Z0L4VCCnaoAMr+HKto4epswEHUeq/EnJNnkTrm4eIMNMuWnITn7/H9yo55c445IeMzdsdrLVbcQgZ7i3iw8Va+l/wectqixREfod9xyuvm+GVBA== 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 Mon, Aug 11, 2025 at 12:21:23PM +0200, David Hildenbrand wrote: > 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. We have 'totalram_pages() < (512 << (20 - PAGE_SHIFT))' check in hugepage_init(). It can [be abstracted out and] re-used. -- Kiryl Shutsemau / Kirill A. Shutemov