shrink_zones() has a special branch to skip the all_unreclaimable()
check during hibernation, because a frozen kswapd can't mark a zone
unreclaimable.
But ever since 6e543d5780e3 ("mm: vmscan: fix do_try_to_free_pages()
livelock"), determining a zone to be unreclaimable is done by directly
looking at its scan history and no longer relies on kswapd setting the
per-zone flag.
Remove this branch and let shrink_zones() check the reclaimability of
the target zones regardless of hibernation state.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
mm/vmscan.c | 8 --------
1 file changed, 8 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0f16ffe8eb67..19b5b8016209 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2534,14 +2534,6 @@ out:
if (sc->nr_reclaimed)
return sc->nr_reclaimed;
- /*
- * As hibernation is going on, kswapd is freezed so that it can't mark
- * the zone into all_unreclaimable. Thus bypassing all_unreclaimable
- * check.
- */
- if (oom_killer_disabled)
- return 0;
-
/* Aborted reclaim to try compaction? don't OOM, then */
if (aborted_reclaim)
return 1;
--
2.0.0
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