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mm/mglru: only clear kswapd_failures if reclaimable 

commit b130ba4a6259f6b64d8af15e9e7ab1e912bcb7ad upstream.

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().

I happened to run into this problem in one of my tests recently.  It
requires a combination of several conditions: The allocator needs to
allocate a right amount of pages such that it can wake up kswapd
without itself being OOM killed; there is no memory for kswapd to
reclaim (My test disables swap and cleans page cache first); no other
process frees enough memory at the same time.

Link: https://lkml.kernel.org/r/20241014221211.832591-1-weixugc@google.com
Fixes: e4dde56cd2 ("mm: multi-gen LRU: per-node lru_gen_folio lists")
Signed-off-by: Wei Xu <weixugc@google.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: Jan Alexander Steffens <heftig@archlinux.org>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wei Xu 2024-10-14 22:12:11 +00:00 committed by Greg Kroah-Hartman
parent 17396e32f9
commit a0035fc555
1 changed files with 2 additions and 2 deletions
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4
mm/vmscan.c
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@ -5603,8 +5603,8 @@ 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;
}
/******************************************************************************