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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v1 02/10] mm/khugepaged: remove READ_ONLY_THP_FOR_FS check Date: Fri, 27 Mar 2026 10:46:43 -0400 X-Mailer: MailMate (2.0r6290) Message-ID: In-Reply-To: <31d9d5c1-02af-42b3-bc3e-aea151d3552b@lucifer.local> References: <20260327014255.2058916-1-ziy@nvidia.com> <20260327014255.2058916-3-ziy@nvidia.com> <31d9d5c1-02af-42b3-bc3e-aea151d3552b@lucifer.local> Content-Type: text/plain Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: BL1PR13CA0410.namprd13.prod.outlook.com (2603:10b6:208:2c2::25) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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 nckQRGsa n90bN4gewJru8OiHV1E8hVS9mtspA6KRh8rprtRgHKEZPW2S9jIjkWzxypXqHlAuzlFvWKDBK8irUbEiINywn/uSCzIH1hVE/P6AlXEWYSMK9AxJ20rXDM9l4Qv2IKR3hU9CZxZyCh07tIc6YAflJ7onDMvOlmQ1vxtbonKHkmR1yOSI9LGKHUDy1Bqx0TOxGnTuhfmm8j0U4j6KvMmQIr5npqX1hyF6PgfV8NzOWvuKNoD3+igbdSziFceZkAKuXjRtK3NuK5EWUIqxy3IPrIIiz5uwCT5z7k2QZNkreBv6ie0HhOFKE72NxKpAMQ7kOWjZCIaFCvAW+oOaOQnsau9wDnEEfWabyaZlX1mDrpM9wqb9iWrhyTzHAoIYWlyLYmzS1jGRVYK6MCcxuVn14C6q69jimX2fVxzX/soHaUVw75iqlGrhDNH8v1w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 27 Mar 2026, at 8:07, Lorenzo Stoakes (Oracle) wrote: > On Thu, Mar 26, 2026 at 09:42:47PM -0400, Zi Yan wrote: >> collapse_file() requires FSes supporting large folio with at least >> PMD_ORDER, so replace the READ_ONLY_THP_FOR_FS check with that. shmem = with >> huge option turned on also sets large folio order on mapping, so the c= heck >> also applies to shmem. >> >> While at it, replace VM_BUG_ON with returning failure values. >> >> Signed-off-by: Zi Yan > > > >> --- >> mm/khugepaged.c | 7 +++++-- >> 1 file changed, 5 insertions(+), 2 deletions(-) >> >> diff --git a/mm/khugepaged.c b/mm/khugepaged.c >> index d06d84219e1b..45b12ffb1550 100644 >> --- a/mm/khugepaged.c >> +++ b/mm/khugepaged.c >> @@ -1899,8 +1899,11 @@ static enum scan_result collapse_file(struct mm= _struct *mm, unsigned long addr, >> int nr_none =3D 0; >> bool is_shmem =3D shmem_file(file); >> >> - VM_BUG_ON(!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && !is_shmem); >> - VM_BUG_ON(start & (HPAGE_PMD_NR - 1)); >> + /* "huge" shmem sets mapping folio order and passes the check below = */ > > I think this isn't quite clear and could be improved to e.g.: > > /* > * Either anon shmem supports huge pages as set by shmem_enabled sysfs= , > * or a shmem file system mounted with the "huge" option. > */ > >> + if (mapping_max_folio_order(mapping) < PMD_ORDER) >> + return SCAN_FAIL; > > As per rest of thread, this looks correct. Will respond to that thread. > >> + if (start & (HPAGE_PMD_NR - 1)) >> + return SCAN_ADDRESS_RANGE; > > Hmm, we're kinda making this - presumably buggy situation - into a vali= d input > that just fails the scan. > > Maybe just make it a VM_WARN_ON_ONCE()? Or if we want to avoid propagat= ing the > bug that'd cause it any further: > > if (start & (HPAGE_PMD_NR - 1)) { > VM_WARN_ON_ONCE(true); > return SCAN_ADDRESS_RANGE; > } > > Or similar. As I responded to David, will change it to VM_WARN_ON_ONCE(). > >> >> result =3D alloc_charge_folio(&new_folio, mm, cc); >> if (result !=3D SCAN_SUCCEED) >> -- >> 2.43.0 >> > > Cheers, Lorenzo Best Regards, Yan, Zi