linux-kernel - Re: [PATCH v3 5/5] block: use largest_zero_folio in __blkdev_issue_zero

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Message-ID: <f7f9e444-1739-4b5e-85e1-3a9f86b7e50a@redhat.com>
Date: Mon, 11 Aug 2025 11:44:18 +0200
From: David Hildenbrand <david@...hat.com>
To: "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>,
 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>
Cc: 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 5/5] block: use largest_zero_folio in
 __blkdev_issue_zero_pages()

On 11.08.25 10:41, Pankaj Raghav (Samsung) wrote:
> From: Pankaj Raghav <p.raghav@...sung.com>
> 
> Use largest_zero_folio() in __blkdev_issue_zero_pages().
> On systems with CONFIG_PERSISTENT_HUGE_ZERO_FOLIO enabled, we will end up
> sending larger bvecs instead of multiple small ones.
> 
> Noticed a 4% increase in performance on a commercial NVMe SSD which does
> not support OP_WRITE_ZEROES. The device's MDTS was 128K. The performance
> gains might be bigger if the device supports bigger MDTS.
> 
> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb