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

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Message-ID: <57bec266-97c4-4292-bd81-93baca737a3c@redhat.com>
Date: Mon, 11 Aug 2025 12:21:23 +0200
From: David Hildenbrand <david@...hat.com>
To: Kiryl Shutsemau <kirill@...temov.name>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: "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 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