It is needed to ensure sc->nr.unqueued_dirty > 0, which can avoid to set PGDAT_DIRTY flag when sc->nr.unqueued_dirty and sc->nr.file_taken are both zero at the same time. Signed-off-by: Zhiguo Jiang <justinjiang@xxxxxxxx> --- Changelog： v1->v2: Update based on the latest version. mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) mode change 100644 => 100755 mm/vmscan.c diff --git a/mm/vmscan.c b/mm/vmscan.c index b4ca3563bcf4..c00418e34dc3 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -5914,7 +5914,7 @@ 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); /* -- 2.39.0
