The patch titled
Subject: mm/mglru: only clear kswapd_failures if reclaimable
has been added to the -mm mm-unstable branch. Its filename is
mm-mglru-only-clear-kswapd_failures-if-reclaimable.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-only-clear-kswapd_failures-if-reclaimable.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Xu <weixugc@xxxxxxxxxx>
Subject: mm/mglru: only clear kswapd_failures if reclaimable
Date: Mon, 14 Oct 2024 22:12:11 +0000
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().
Link: https://lkml.kernel.org/r/20241014221211.832591-1-weixugc@xxxxxxxxxx
Fixes: e4dde56cd208 ("mm: multi-gen LRU: per-node lru_gen_folio lists")
Signed-off-by: Wei Xu <weixugc@xxxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: Jan Alexander Steffens <heftig@xxxxxxxxxxxxx>
Cc: Suleiman Souhlal <suleiman@xxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/mm/vmscan.c~mm-mglru-only-clear-kswapd_failures-if-reclaimable
+++ a/mm/vmscan.c
@@ -4976,8 +4976,8 @@ static void lru_gen_shrink_node(struct p
blk_finish_plug(&plug);
done:
- /* kswapd should never fail */
- pgdat->kswapd_failures = 0;
+ if (sc->nr_reclaimed > reclaimed)
+ pgdat->kswapd_failures = 0;
}
/******************************************************************************
_
Patches currently in -mm which might be from weixugc@xxxxxxxxxx are
mm-mglru-only-clear-kswapd_failures-if-reclaimable.patch
mm-mglru-reset-page-lru-tier-bits-when-activating.patch
