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b=B1GL/mD1Td9Y5AZpVRTtCer8n0RvQoB7HOabqGu/FuF0ZvUY4MSK0i7z8j/YxiBTJIto8EZkWfaFNTl5wmXME8PrUFJs3gLzpjPrLPFWQzIPI0k90SixgWlHG8rlF/ncyuHBnqC/x7MxO0k/rWG8wmN7+mR1MgnqSny1ExVwdJ7Kh6hfZFeLzAillbVcAPszQI8KyGcWYwG+3daHF183J+5a5GNrLp9EhViJQK3pHm4icrucmchSddc6r94eVXv+bNFxaGr3s1Kxww3f51SaZ2HMPyJRmvfMxCM25tyasBCJarYGJTCdJplIWlIkr+0oi4U0XqKDsigVZbFnAC359Q== Received: from DM4PR12MB9072.namprd12.prod.outlook.com (2603:10b6:8:be::6) by SN7PR12MB7836.namprd12.prod.outlook.com (2603:10b6:806:34e::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9564.11; Fri, 30 Jan 2026 11:11:34 +0000 Received: from DM4PR12MB9072.namprd12.prod.outlook.com ([fe80::9e49:782:8e98:1ff1]) by DM4PR12MB9072.namprd12.prod.outlook.com ([fe80::9e49:782:8e98:1ff1%5]) with mapi id 15.20.9564.013; Fri, 30 Jan 2026 11:11:34 +0000 From: Jordan Niethe To: linux-mm@kvack.org Cc: balbirs@nvidia.com, matthew.brost@intel.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, david@redhat.com, ziy@nvidia.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, lyude@redhat.com, dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, rcampbell@nvidia.com, mpenttil@redhat.com, jgg@nvidia.com, willy@infradead.org, linuxppc-dev@lists.ozlabs.org, intel-xe@lists.freedesktop.org, jgg@ziepe.ca, Felix.Kuehling@amd.com, jniethe@nvidia.com, jhubbard@nvidia.com, maddy@linux.ibm.com, mpe@ellerman.id.au Subject: [PATCH v5 11/13] mm/util: Add flag to track device private pages in page snapshots Date: Fri, 30 Jan 2026 22:10:48 +1100 Message-Id: <20260130111050.53670-12-jniethe@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260130111050.53670-1-jniethe@nvidia.com> References: <20260130111050.53670-1-jniethe@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BY5PR17CA0064.namprd17.prod.outlook.com (2603:10b6:a03:167::41) To DM4PR12MB9072.namprd12.prod.outlook.com (2603:10b6:8:be::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR12MB9072:EE_|SN7PR12MB7836:EE_ X-MS-Office365-Filtering-Correlation-Id: 14dea54f-ab06-4cb9-c022-08de5ff05413 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|366016; 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This will mean that device private pages no longer have normal pfns and must be handled separately. Add a new flag PAGE_SNAPSHOT_DEVICE_PRIVATE to track when the pfn of a page snapshot is a device private page. Signed-off-by: Jordan Niethe Signed-off-by: Alistair Popple --- v1: - No change v2: - No change v3: - No change v4: - Move logical continuation to previous line --- fs/proc/page.c | 6 ++++-- include/linux/mm.h | 7 ++++--- mm/util.c | 3 +++ 3 files changed, 11 insertions(+), 5 deletions(-) diff --git a/fs/proc/page.c b/fs/proc/page.c index f9b2c2c906cd..bc14f7ebc369 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -191,10 +191,12 @@ u64 stable_page_flags(const struct page *page) folio_test_large_rmappable(folio)) { /* Note: we indicate any THPs here, not just PMD-sized ones */ u |= 1 << KPF_THP; - } else if (is_huge_zero_pfn(ps.pfn)) { + } else if (!(ps.flags & PAGE_SNAPSHOT_DEVICE_PRIVATE) && + is_huge_zero_pfn(ps.pfn)) { u |= 1 << KPF_ZERO_PAGE; u |= 1 << KPF_THP; - } else if (is_zero_pfn(ps.pfn)) { + } else if (!(ps.flags & PAGE_SNAPSHOT_DEVICE_PRIVATE) && + is_zero_pfn(ps.pfn)) { u |= 1 << KPF_ZERO_PAGE; } diff --git a/include/linux/mm.h b/include/linux/mm.h index f0d5be9dc736..a52979536a5e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -4627,9 +4627,10 @@ static inline bool page_pool_page_is_pp(const struct page *page) } #endif -#define PAGE_SNAPSHOT_FAITHFUL (1 << 0) -#define PAGE_SNAPSHOT_PG_BUDDY (1 << 1) -#define PAGE_SNAPSHOT_PG_IDLE (1 << 2) +#define PAGE_SNAPSHOT_FAITHFUL (1 << 0) +#define PAGE_SNAPSHOT_PG_BUDDY (1 << 1) +#define PAGE_SNAPSHOT_PG_IDLE (1 << 2) +#define PAGE_SNAPSHOT_DEVICE_PRIVATE (1 << 3) struct page_snapshot { struct folio folio_snapshot; diff --git a/mm/util.c b/mm/util.c index 97cae40c0209..65e3f1a97d76 100644 --- a/mm/util.c +++ b/mm/util.c @@ -1218,6 +1218,9 @@ static void set_ps_flags(struct page_snapshot *ps, const struct folio *folio, if (folio_test_idle(folio)) ps->flags |= PAGE_SNAPSHOT_PG_IDLE; + + if (is_device_private_page(page)) + ps->flags |= PAGE_SNAPSHOT_DEVICE_PRIVATE; } /** -- 2.34.1