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

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Message-ID: <p6ciia5cm5re4paau3tqhcdk3cdjmnwjuc2l5rv6ztb6kcgvyp@2g6ei7okvuw5>
Date: Mon, 11 Aug 2025 12:19:51 +0200
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: Kiryl Shutsemau <kirill@...temov.name>
Cc: David Hildenbrand <david@...hat.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>, Lorenzo Stoakes <lorenzo.stoakes@...cle.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

> > Sorry, RFC v2 I think. It got a bit confusing with series names/versions.
> 
> 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.

We do need physical as the main usecase was for block IO where we will
be DMAing. The main reason I was seeing an improvement in perf was we
were sending bigger chunks of memory in a single bio_vec instead of
using multiple bio_vec.

--
Pankaj