lru_gen_shrink_node() unconditionally clears kswapd_failures, which
can prevent kswapd from sleeping and cause 100% kswapd cpu usage even
when kswapd repeatedly fails to make progress in reclaim.
Only clear kswap_failures in lru_gen_shrink_node() if reclaim makes
some progress, similar to shrink_node().
Fixes: e4dde56cd208 ("mm: multi-gen LRU: per-node lru_gen_folio lists")
Signed-off-by: Wei Xu <weixugc@xxxxxxxxxx>
---
mm/vmscan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 50dc06d55b1d..9d1e1c4e383d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4970,8 +4970,8 @@ static void lru_gen_shrink_node(struct pglist_data *pgdat, struct scan_control *
blk_finish_plug(&plug);
done:
- /* kswapd should never fail */
- pgdat->kswapd_failures = 0;
+ if (sc->nr_reclaimed > reclaimed)
+ pgdat->kswapd_failures = 0;
}
/******************************************************************************
--
2.47.0.rc1.288.g06298d1525-goog
