+ mm-fix-shrink-nrunqueued_dirty-counter-issue.patch added to mm-unstable branch

+ mm-fix-shrink-nrunqueued_dirty-counter-issue.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: fix shrink nr.unqueued_dirty counter issue
has been added to the -mm mm-unstable branch.  Its filename is
     mm-fix-shrink-nrunqueued_dirty-counter-issue.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-fix-shrink-nrunqueued_dirty-counter-issue.patch

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

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------------------------------------------------------
From: Zhiguo Jiang <justinjiang@vivo.com>
Subject: mm: fix shrink nr.unqueued_dirty counter issue
Date: Fri, 12 Jan 2024 09:23:52 +0800

It is needed to ensure sc->nr.unqueued_dirty > 0, which can avoid setting
PGDAT_DIRTY flag when sc->nr.unqueued_dirty and sc->nr.file_taken are both
zero.

Link: https://lkml.kernel.org/r/20240112012353.1387-1-justinjiang@vivo.com
Signed-off-by: Zhiguo Jiang <justinjiang@vivo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/vmscan.c~mm-fix-shrink-nrunqueued_dirty-counter-issue
+++ a/mm/vmscan.c
@@ -5984,7 +5984,8 @@ again:
 			set_bit(PGDAT_WRITEBACK, &pgdat->flags);
 
 		/* Allow kswapd to start writing pages during reclaim.*/
-		if (sc->nr.unqueued_dirty == sc->nr.file_taken)
+		if (sc->nr.unqueued_dirty &&
+			sc->nr.unqueued_dirty == sc->nr.file_taken)
 			set_bit(PGDAT_DIRTY, &pgdat->flags);
 
 		/*
_

Patches currently in -mm which might be from justinjiang@vivo.com are

mm-fix-shrink-nrunqueued_dirty-counter-issue.patch