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Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Baolin Wang" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Barry Song" , "Lance Yang" , "Usama Arif" , "Gregory Price" , "Ying Huang" , "Alistair Popple" , "Johannes Weiner" , "Qi Zheng" , "Shakeel Butt" , "Kairui Song" From: "Zi Yan" Subject: Re: [PATCH RFC 14/14] mm/page-flags: remove PG_private X-Mailer: aerc 0.21.0 References: <20260731-remove-pg_private-v1-0-142c97ba3562@nvidia.com> <20260731-remove-pg_private-v1-14-142c97ba3562@nvidia.com> In-Reply-To: <20260731-remove-pg_private-v1-14-142c97ba3562@nvidia.com> X-ClientProxiedBy: CH0PR13CA0036.namprd13.prod.outlook.com (2603:10b6:610:b2::11) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|MW4PR12MB7264:EE_ X-MS-Office365-Filtering-Correlation-Id: 57d4e04f-3b14-4192-10bb-08def8adb6c3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016|23010399003|22082099003|18002099003|4143699003|11063799006|56012099006|6133799003|10067099003|921020; 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All PG_private users are converted. Remove PG_private and > reserve the space as __PG_folio for future use. > > Also update files in Documentation. hugetlbfs_reserv.rst is outdated and > left unchanged. It should be rewritten. > > Assisted-by: Claude:claude-opus-4-8 > Assisted-by: Codex:gpt-5 > Signed-off-by: Zi Yan > To: Andrew Morton > To: Baoquan He > To: Mike Rapoport > To: Pasha Tatashin > To: Pratyush Yadav > To: Jonathan Corbet > To: "Matthew Wilcox (Oracle)" > To: Jan Kara > To: David Hildenbrand > To: Steven Rostedt > To: Masami Hiramatsu > Cc: Dave Young > Cc: Shuah Khan > Cc: Lorenzo Stoakes > Cc: "Liam R. Howlett" > Cc: Vlastimil Babka > Cc: Suren Baghdasaryan > Cc: Michal Hocko > Cc: Mathieu Desnoyers > Cc: kexec@lists.infradead.org > Cc: linux-doc@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-fsdevel@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-trace-kernel@vger.kernel.org > --- > Documentation/admin-guide/kdump/vmcoreinfo.rst | 2 +- > Documentation/filesystems/vfs.rst | 6 +++--- > include/linux/page-flags.h | 19 ++----------------- > include/trace/events/mmflags.h | 2 +- > kernel/vmcore_info.c | 1 - > 5 files changed, 7 insertions(+), 23 deletions(-) > > diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentati= on/admin-guide/kdump/vmcoreinfo.rst > index 7663c610fe901..5f1df6d080508 100644 > --- a/Documentation/admin-guide/kdump/vmcoreinfo.rst > +++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst > @@ -325,7 +325,7 @@ NR_FREE_PAGES > On linux-2.6.21 or later, the number of free pages is in > vm_stat[NR_FREE_PAGES]. Used to get the number of free pages. > =20 > -PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_hwpoison|PG_head_mask > +PG_lru|PG_swapcache|PG_swapbacked|PG_hwpoison|PG_head_mask > ------------------------------------------------------------------------= -- > =20 > Page attributes. These flags are used to filter various unnecessary for > diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystem= s/vfs.rst > index e7677423a20f7..5cc07f82fe371 100644 > --- a/Documentation/filesystems/vfs.rst > +++ b/Documentation/filesystems/vfs.rst > @@ -649,8 +649,8 @@ Writeback. > =20 > The first can be used independently to the others. The VM can try to > release clean pages in order to reuse them. To do this it can call > -->release_folio on clean folios with the private > -flag set. Clean pages without PagePrivate and with no external referenc= es > +->release_folio on clean folios with folio->private set. Clean pages > +without folio->private set and with no external references > will be released without notice being given to the address_space. > =20 > To achieve this functionality, pages need to be placed on an LRU with > @@ -674,7 +674,7 @@ filemap_fdatawait_range, to wait for all writeback to= complete. > =20 > An address_space handler may attach extra information to a page, > typically using the 'private' field in the 'struct page'. If such > -information is attached, the PG_Private flag should be set. This will > +information is attached, non-NULL 'private' field will > cause various VM routines to make extra calls into the address_space > handler to deal with that data. > =20 > diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h > index 0e3628ea080c4..eb2961ed61018 100644 > --- a/include/linux/page-flags.h > +++ b/include/linux/page-flags.h > @@ -44,10 +44,6 @@ > * Consequently, PG_reserved for a page mapped into user space can indic= ate > * the zero page, the vDSO, MMIO pages or device memory. > * > - * The PG_private bitflag is set on pagecache pages if they contain file= system > - * specific data (which is normally at page->private). It can be used by > - * private allocations for its own usage. > - * > * During initiation of disk I/O, PG_locked is set. This bit is set befo= re I/O > * and cleared when writeback _starts_ or when read _completes_. PG_writ= eback > * is set before writeback starts and cleared when it finishes. > @@ -105,7 +101,7 @@ enum pageflags { > PG_owner_2, /* Owner use. If pagecache, fs may use */ > PG_arch_1, > PG_reserved, > - PG_private, /* If pagecache, has fs-private data */ > + __PG_folio, /* Do not use: reserved for folio identification */ Sashiko asked how to detect leaked filesystem private data during page free time after PG_private is removed. Answer: After the conversion, folio/page should have an elevated refcount whenever ->private is set. That would help detect leaked private data. I tried to enforce ->private needs to be NULL at page free time[1], but that might cause trouble for certain use cases. [1] https://lore.kernel.org/all/20260223032641.1859381-1-ziy@nvidia.com/ > diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c > index 8614430ca212a..5a417f8a922ab 100644 > --- a/kernel/vmcore_info.c > +++ b/kernel/vmcore_info.c > @@ -216,7 +216,6 @@ static int __init crash_save_vmcoreinfo_init(void) > VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES); > VMCOREINFO_NUMBER(NR_FREE_PAGES); > VMCOREINFO_NUMBER(PG_lru); > - VMCOREINFO_NUMBER(PG_private); > VMCOREINFO_NUMBER(PG_swapcache); > VMCOREINFO_NUMBER(PG_swapbacked); > #define PAGE_SLAB_MAPCOUNT_VALUE (PGTY_slab << 24) Sashiko asked if removing PG_private from vmcoreinfo breaks back compatiblity for related userspace tools. Answer: Userspace tools will adapt to the changes. --=20 Best Regards, Yan, Zi