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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Aug 2025 10:13:59.1642 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dfbd8093-ba18-4578-7bb8-08dddfd24787 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF0000B61E.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR08MB10758 On 20/08/25 2:37 pm, Baolin Wang wrote: > Similar to the anonymous folios collapse, we should also check the 'khugepaged_max_ptes_none' > when trying to collapse shmem/file folios. > > Signed-off-by: Baolin Wang > --- > mm/khugepaged.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index 5a3386043f39..5d4493b77f3c 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -2125,6 +2125,13 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr, > } > } > nr_none++; > + > + if (cc->is_khugepaged && nr_none > khugepaged_max_ptes_none) { > + result = SCAN_EXCEED_NONE_PTE; > + count_vm_event(THP_SCAN_EXCEED_NONE_PTE); > + goto xa_locked; > + } > + > index++; > continue; > } Isn't this already being checked in collapse_scan_file(), in the block if (cc->is_khugepaged && present < HPAGE_PMD_NR - khugepaged_max_ptes_none)?