mm/swap: revert to single-folio writes for synchronous swap devices

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Patch series "swap_ops updates", v2.

This series is a follow on to the swap ops series now in mm-unstable.

The first patch reintroduces direct folio writes for synchronous
swap files, the other two remove the double indirect for file
system based swap.


This patch (of 3):

Kairui Song reported that zram benefits from submitting each folio
directly instead of batching up I/O because the classic LRU scanning
benefits from clearing the folio writeback bit in the scan loop.

Accommodate that by kicking off writes for synchronous devices for each
iteration.

Link: https://lore.kernel.org/20260723054622.3460249-1-hch@lst.de
Link: https://lore.kernel.org/20260723054622.3460249-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Usama Arif <usama.arif@linux.dev>
Acked-by: Chris Li <chrisl@kernel.org>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kairui Song <ryncsn@gmail.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Steve French <sfrench@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Christoph Hellwig 2026-07-23 07:46:04 +02:00 • committed by Andrew Morton

parent f7bf5cd5b5

commit 3c5194eb2e

1 changed files with 10 additions and 1 deletions

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mm/page_io.c

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