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Fri, 17 Jul 2026 06:44:07 +0000 (UTC) Received: from p1.redhat.com (unknown [10.22.74.7]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B3D3B180036E; Fri, 17 Jul 2026 06:43:57 +0000 (UTC) From: Nico Pache To: Barry Song , David Hildenbrand , linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: ljs@kernel.org, willy@infradead.org, Nico Pache , Zi Yan , Oscar Salvador , Andrew Morton , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple Subject: [PATCH v2 1/2] mm: decrement MTHP_STAT_NR_ANON in free_zone_device_folio() Date: Fri, 17 Jul 2026 00:44:59 -0600 Message-ID: <20260717064502.1980173-2-npache@redhat.com> In-Reply-To: <20260717064502.1980173-1-npache@redhat.com> References: <20260717064502.1980173-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Mimecast-MFC-PROC-ID: psIken89cqP28fleaJpQi9w3r-SHwp9VEeBHT-64VSo_1784270648 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 1398320007 X-Stat-Signature: 97s8k46dyadd7wzmpik8zdfcsmzaux6b X-HE-Tag: 1784270656-455198 X-HE-Meta: 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 uh9GyxTy dtKVHEJtFR1wfLQPBZVXNs0712DeS4pryLNZN7pz96H/KI6N/ergs8tvQV9DLsfL6VUgAv/3rksGZDXei6Ylw0LVhXIH0WaHo1fGcFm+atiFwbXG10psPFqYJNvKhbDGI4BKriMDRH7QNtb+icCaxIHPw88ot6sYRg7UZIlLpZlfVqI//+T6dFYM0EKyx2DaAyKMTBC/QZKYVQvCUua6j+QZzsqWZ0+n252LyC1iz073iyFI+zwaDBQVhE/1Fjfc8QceBWzyGoUVab2LLzCA5V13g4EueuyqrvByYpj8cyJUOXsrNIob17vPVVMIZC4ai0cuqVnuScBTyzi4LzTBPhQzyuwaEzcl96nvZ2sdNSngREDdivygiG72bE9e8wMSbROeQlNIVpDjtEa48mOWSwcXQ29RdRpn7KFAJK/sVQNlowwfgtAmv/LCVt3sTL93jNZknCRj9MYc1LAYp3H+fyg5CiCCJmUcpNATFl9SRkeNs1UpTLN/inosRvl/jg/FMeOwl Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When a zone device folio is mapped as anonymous, folio_add_new_anon_rmap() increments MTHP_STAT_NR_ANON. The corresponding decrement lives in __free_pages_prepare() in page_alloc.c, but zone device folios are freed via free_zone_device_folio() which never calls __free_pages_prepare(). This causes nr_anon to remain permanently elevated after zone device folios are freed. Add the missing mod_mthp_stat() decrement to free_zone_device_folio() so that the counter is properly balanced. Fixes: 5d65c8d758f2 ("mm: count the number of anonymous THPs per size") Reviewed-by: Zi Yan Co-developed-by: David Hildenbrand Signed-off-by: David Hildenbrand Signed-off-by: Nico Pache --- mm/memremap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memremap.c b/mm/memremap.c index 81766d822400..accba23aef28 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -425,6 +425,7 @@ void free_zone_device_folio(struct folio *folio) mem_cgroup_uncharge(folio); if (folio_test_anon(folio)) { + mod_mthp_stat(folio_order(folio), MTHP_STAT_NR_ANON, -1); for (i = 0; i < nr; i++) __ClearPageAnonExclusive(folio_page(folio, i)); } -- 2.55.0