linux-kernel - Re: [PATCH v3 0/5] add persistent huge zero folio support

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Message-ID: <b087814e-8bdf-4503-a6ba-213db4263083@lucifer.local>
Date: Mon, 11 Aug 2025 11:09:24 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Kiryl Shutsemau <kirill@...temov.name>
Cc: David Hildenbrand <david@...hat.com>,
        "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Ryan Roberts <ryan.roberts@....com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Vlastimil Babka <vbabka@...e.cz>, Zi Yan <ziy@...dia.com>,
        Mike Rapoport <rppt@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>, Nico Pache <npache@...hat.com>,
        Dev Jain <dev.jain@....com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, willy@...radead.org,
        Ritesh Harjani <ritesh.list@...il.com>, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, "Darrick J . Wong" <djwong@...nel.org>,
        mcgrof@...nel.org, gost.dev@...sung.com, hch@....de,
        Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH v3 0/5] add persistent huge zero folio support

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.