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mm: fix shrink nr.unqueued_dirty counter issue

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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>
This commit is contained in:
Zhiguo Jiang 2024-01-12 09:23:52 +08:00 committed by Andrew Morton
parent 5059aa6334
commit bbc251f30e
1 changed files with 2 additions and 1 deletions
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3
mm/vmscan.c
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@ -5990,7 +5990,8 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
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);
/*