+ block-use-largest_zero_folio-in-__blkdev_issue_zero_pages.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: block: use largest_zero_folio in __blkdev_issue_zero_pages()
has been added to the -mm mm-new branch.  Its filename is
     block-use-largest_zero_folio-in-__blkdev_issue_zero_pages.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/block-use-largest_zero_folio-in-__blkdev_issue_zero_pages.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
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fixup patches in mm-new.

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------------------------------------------------------
From: Pankaj Raghav <p.raghav@samsung.com>
Subject: block: use largest_zero_folio in __blkdev_issue_zero_pages()
Date: Mon, 11 Aug 2025 10:41:13 +0200

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.

Link: https://lkml.kernel.org/r/20250811084113.647267-6-kernel@pankajraghav.com
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Luis Chamberalin <mcgrof@kernel.org>
Cc: Mariano Pache <npache@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 block/blk-lib.c |   15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

--- a/block/blk-lib.c~block-use-largest_zero_folio-in-__blkdev_issue_zero_pages
+++ a/block/blk-lib.c
@@ -196,6 +196,8 @@ static void __blkdev_issue_zero_pages(st
 		sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
 		struct bio **biop, unsigned int flags)
 {
+	struct folio *zero_folio = largest_zero_folio();
+
 	while (nr_sects) {
 		unsigned int nr_vecs = __blkdev_sectors_to_bio_pages(nr_sects);
 		struct bio *bio;
@@ -208,15 +210,14 @@ static void __blkdev_issue_zero_pages(st
 			break;
 
 		do {
-			unsigned int len, added;
+			unsigned int len;
 
-			len = min_t(sector_t,
-				PAGE_SIZE, nr_sects << SECTOR_SHIFT);
-			added = bio_add_page(bio, ZERO_PAGE(0), len, 0);
-			if (added < len)
+			len = min_t(sector_t, folio_size(zero_folio),
+				    nr_sects << SECTOR_SHIFT);
+			if (!bio_add_folio(bio, zero_folio, len, 0))
 				break;
-			nr_sects -= added >> SECTOR_SHIFT;
-			sector += added >> SECTOR_SHIFT;
+			nr_sects -= len >> SECTOR_SHIFT;
+			sector += len >> SECTOR_SHIFT;
 		} while (nr_sects);
 
 		*biop = bio_chain_and_submit(*biop, bio);
_

Patches currently in -mm which might be from p.raghav@samsung.com are

mm-rename-huge_zero_page-to-huge_zero_folio.patch
mm-rename-mmf_huge_zero_page-to-mmf_huge_zero_folio.patch
mm-add-persistent-huge-zero-folio.patch
mm-add-largest_zero_folio-routine.patch
block-use-largest_zero_folio-in-__blkdev_issue_zero_pages.patch