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Sun, 01 Mar 2026 23:03:52 -0800 (PST) Date: Mon, 2 Mar 2026 07:03:26 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <20260302070351.3465439-1-bingjiao@google.com> Subject: [PATCH] mm/vmscan: restore allowed mask in alloc_demote_folio() From: Bing Jiao To: linux-mm@kvack.org Cc: Bing Jiao , Andrew Morton , Johannes Weiner , David Hildenbrand , Michal Hocko , Qi Zheng , Shakeel Butt , Lorenzo Stoakes , Axel Rasmussen , Yuanchu Xie , Wei Xu , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 7FFDDA0007 X-Stat-Signature: 4zxud195b1zyyfeehc3w5mxinnkpxhxm X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1772435034-25651 X-HE-Meta: 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 pmgvZiKW ftzooF9mY+z/oq45dkqB0P5X9qqaOXELUM31J3791lF7JEz9ceARUyvaZFQxF6/9trMXtP0039N57BGVwGO5mqG6QBZxWYiZFXUZWpU0Lz68gKOuBg1mLPn6mzarxrBEA7CXllwItBnA4V3JEpcTW4jNDcGgyFBHg0Fv6gNVtI4V+8PDVp1pFOrsTLMf/vsSrhVKYgAvLqwD/0gekjP/LCcQAqjyz+DNMUGUBG/TDVH8HiWsHPWiOoLSaBiZlsHzEhcI0DVy35nGI3HYgmABSNBiMyMj6PNAbbDoUj83IVC9PVpz4HWBxcEhk+Tn0OpkOR4E9CKm6IPFpf81vNgsk5+esMJyiqgNhKLoIO/rxnfQhUFFPDiZcpNXCIOjfcc0LNx4HZszEEw4Ph57mcVvu+6wR2g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: In alloc_demote_folio(), mtc->nmask is set to NULL for the first allocation. If that succeeds, it returns without restoring mtc->nmask to allowed_mask. For subsequent allocations from the migrate_pages() batch, mtc->nmask will be NULL. If the target node then becomes full, the fallback allocation will use nmask = NULL, allocating from any node allowed by the task cpuset, which for kswapd is all nodes. To address this issue, restore the mtc->nmask to its original allowed nodemask after the first allocation. Signed-off-by: Bing Jiao --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index cbffc0a27824..b42abd17aee7 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -985,11 +985,11 @@ static struct folio *alloc_demote_folio(struct folio *src, mtc->nmask = NULL; mtc->gfp_mask |= __GFP_THISNODE; dst = alloc_migration_target(src, (unsigned long)mtc); + mtc->nmask = allowed_mask; if (dst) return dst; mtc->gfp_mask &= ~__GFP_THISNODE; - mtc->nmask = allowed_mask; return alloc_migration_target(src, (unsigned long)mtc); } -- 2.53.0.473.g4a7958ca14-goog