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Mon, 11 Aug 2025 06:17:40 -0400 (EDT) Date: Mon, 11 Aug 2025 11:17:37 +0100 From: Kiryl Shutsemau To: Lorenzo Stoakes Cc: David Hildenbrand , "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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 56A5E140002 X-Stat-Signature: fr36zm9ow43d5m6ackf7yfyepib3wfdz X-HE-Tag: 1754907465-283246 X-HE-Meta: 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 cNk1T02h tjfLrak12HylrOBFgXo67wjqiQzNmDp+T/vcqSx1o8ddoFKDRH8Temci4ZUup+hQqcrSPsUndPYsPTWLHZLRf8ZiQZlX7blqbb8gFe1ksfLY5W1YvvBSnRzy9bivMhEZTvet1nR5oLePKNyJh8cLJAbHucvOwlgBmLzxihzs5DaZqfcvQ17lvhwRHO2Mpuhh/S20sFHC3p8rgyE8BqU8/tAZ3AKgV/1MdqkBO2ttShGsSV6iEPhZ9tYw6JnSLPEL0RmldkCJ4SYBv1CYhbWgNlBuQazUjyMPRDGYmaPqMfZ1zbLVtXcTnDngAUDPguVxkQs5BvaR4KKT7d0lF6oOMMokLDfPGX6Pcr1o3oTrkVIVsAsbPP2J/ZkF8io7M/VyVH+vio0UAgkBB0NoRz2pzq9iPCl1hZicO0t+WRwcknEAJFUe+SKYd4T5DrszBapbdWWTxnIPBpHlQ1pm+JnAmcH67uXZMItGJmbO3 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 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. -- Kiryl Shutsemau / Kirill A. Shutemov