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mm/damon/ops-common: putback folios on invalid migrate nid

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damon_pa_migrate() and damos_va_migrate() isolate folios into a local list
and then call damon_migrate_pages().  When target_nid is invalid
(including the scheme default NUMA_NO_NODE / -1), damon_migrate_pages()
returns early without putting the folios back to the LRU.

Callers then discard the list head while those folios remain isolated with
an extra reference taken by folio_isolate_lru().  The pages stay off the
LRU for as long as the mapping exists (anon active+inactive counts drop
while RSS does not), and the leftover references can pin the pages after
the mapping is gone.

Put the folios back on the invalid-nid path so ignored migration requests
still return them to the LRU.

Link: https://lore.kernel.org/20260726014815.1280757-1-dayou5941@163.com
Fixes: 7e6c313069 ("mm/damon/ops-common: ignore migration request to invalid nodes")
Assisted-by: Cursor:grok-4.5
Reviewed-by: SJ Park <sj@kernel.org>
Signed-off-by: liyouhong <liyouhong@kylinos.cn>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
liyouhong 2026-07-26 09:48:15 +08:00 committed by Andrew Morton
parent aca1f2d5de
commit 5deb65c34e
1 changed files with 8 additions and 1 deletions
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9
mm/damon/ops-common.c
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@ -392,8 +392,15 @@ unsigned long damon_migrate_pages(struct list_head *folio_list, int target_nid)
return nr_migrated;
if (target_nid < 0 || target_nid >= MAX_NUMNODES ||
!node_state(target_nid, N_MEMORY))
!node_state(target_nid, N_MEMORY)) {
while (!list_empty(folio_list)) {
struct folio *folio = lru_to_folio(folio_list);
list_del(&folio->lru);
folio_putback_lru(folio);
}
return nr_migrated;
}
noreclaim_flag = memalloc_noreclaim_save();