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Howlett" , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple Subject: [PATCH mm-unstable v1 3/3] mm/huge_memory.c: Skip zero-page remapping when underused THP shrinker is disabled Date: Tue, 9 Jun 2026 05:46:15 -0600 Message-ID: <20260609114619.144416-4-npache@redhat.com> In-Reply-To: <20260609114619.144416-1-npache@redhat.com> References: <20260609114619.144416-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-MFC-PROC-ID: 5cYDHSYlvkexVusecwi7u-W51vj0X6H4riIx4QS12tg_1781005578 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: 3E3B21A000B X-Stat-Signature: jqeuj9okxdsswee8cbnwjckkkjei7urk X-Rspamd-Server: rspam03 X-Rspam-User: X-HE-Tag: 1781005585-660992 X-HE-Meta: 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 mbItsghq 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The zero-page remapping in __folio_split() was added to support the underused THP shrinker. When the shrinker is disabled via shrink_underused, gate TTU_USE_SHARED_ZEROPAGE on split_underused_thp to avoid scanning subpages for zero content unnecessarily. Suggested-by: David Hildenbrand Signed-off-by: Nico Pache --- mm/huge_memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 94bd656eeaf8..37748d92f277 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -4103,7 +4103,7 @@ static int __folio_split(struct folio *folio, unsigned int new_order, if (nr_shmem_dropped) shmem_uncharge(mapping->host, nr_shmem_dropped); - if (!ret && is_anon && !folio_is_device_private(folio)) + if (!ret && is_anon && !folio_is_device_private(folio) && split_underused_thp) ttu_flags = TTU_USE_SHARED_ZEROPAGE; remap_page(folio, 1 << old_order, ttu_flags); -- 2.54.0