linux-kernel - Re: [PATCH 0/5] add STATIC_PMD_ZERO

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Message-ID: <9de7fbb6-63de-40eb-b2c0-cbf9fb084bee@pankajraghav.com>
Date: Mon, 16 Jun 2025 11:00:19 +0200
From: Pankaj Raghav <kernel@...kajraghav.com>
To: Christoph Hellwig <hch@....de>, Pankaj Raghav <p.raghav@...sung.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>,
 Ryan Roberts <ryan.roberts@....com>, Mike Rapoport <rppt@...nel.org>,
 Michal Hocko <mhocko@...e.com>, Thomas Gleixner <tglx@...utronix.de>,
 Nico Pache <npache@...hat.com>, Dev Jain <dev.jain@....com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Borislav Petkov <bp@...en8.de>,
 Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>,
 Vlastimil Babka <vbabka@...e.cz>, Zi Yan <ziy@...dia.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 David Hildenbrand <david@...hat.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jens Axboe <axboe@...nel.dk>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, willy@...radead.org,
 x86@...nel.org, linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 "Darrick J . Wong" <djwong@...nel.org>, mcgrof@...nel.org,
 gost.dev@...sung.com
Subject: Re: [PATCH 0/5] add STATIC_PMD_ZERO_PAGE config option

On 6/16/25 07:40, Christoph Hellwig wrote:
> Just curious: why doesn't this series get rid of the iomap zero_page,
> which would be really low hanging fruit?
> 

I did the conversion in my first RFC series [1]. But the implementation and API for the zero
page was still under heavy discussion. So I decided to focus on that instead and leave the
conversion for later as I mentioned in the cover letter. I included blkdev_issue_zero_pages() as it
is a more straight forward conversion.

--
Pankaj

[1] https://lore.kernel.org/linux-mm/20250516101054.676046-4-p.raghav@samsung.com/