mm: vmscan.c: fix OOM on swap stress test
I found a regression on mm-unstable during my swap stress test, using tmpfs to compile linux. The test OOM very soon after the make spawns many cc processes. It bisects down to this change: 33dfe920 (mm/gup: clear the LRU flag of a page before adding to LRU batch) Yu Zhao propose the fix: "I think this is one of the potential side effects -- Huge mentioned earlier about isolate_lru_folios():" I test that with it the swap stress test no longer OOM. Link: https://lore.kernel.org/r/CAOUHufYi9h0kz5uW3LHHS3ZrVwEq-kKp8S6N-MZUmErNAXoXmw@mail.gmail.com/ Link: https://lkml.kernel.org/r/20240905-lru-flag-v2-1-8a2d9046c594@kernel.org Fixes: 33dfe920 ("mm/gup: clear the LRU flag of a page before adding to LRU batch") Signed-off-by: Chris Li <chrisl@kernel.org> Suggested-by: Yu Zhao <yuzhao@google.com> Suggested-by: Hugh Dickins <hughd@google.com> Closes: https://lore.kernel.org/all/CAF8kJuNP5iTj2p07QgHSGOJsiUfYpJ2f4R1Q5-3BN9JiD9W_KA@mail.gmail.com/Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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