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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2025 06:59:15.1290 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 30363a62-144d-44f9-4930-08ddb86ccaa5 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: AMS0EPF00000192.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB9872 On 01/07/25 12:20 pm, Lorenzo Stoakes wrote: > On Tue, Jul 01, 2025 at 12:00:21PM +0530, Dev Jain wrote: >> On 01/07/25 11:23 am, Lorenzo Stoakes wrote: >>> On Tue, Jul 01, 2025 at 11:15:25AM +0530, Dev Jain wrote: >>>> Sorry I am not following, don't know in detail about the VMA merge stuff. >>>> Are you saying the after the patch, the VMAs will eventually get merged? >>>> Is it possible in the kernel to get a merge in the "future"; as I understand >>>> it only happens at mmap() time? >>>> >>>> Suppose before the patch, you have two consecutive VMAs between (PMD, 2*PMD) size. >>>> If they are able to get merged after the patch, why won't they be merged before the patch, >>>> since the VMA characteristics are the same? >>>> >>>> >>> Rik's patch aligned each to 2 MiB boundary. So you'd get gaps: >>> >>> >>> 0 2MB 4MB 6MB 8MB 10MB >>> |-------------.------| |-------------.------| |-------------.------| >>> | . | | . | | . | >>> | . | | . | | . | >>> |-------------.------| |-------------.------| |-------------.------| >>> huge mapped 4k m'd >> The effort to draw this is appreciated! >> >> I understood the alignment, what I am asking is this: >> >> In __get_unmapped_area(), we will return a THP-aligned addr from >> thp_get_unmapped_area_vmflags(). Now for the diagram you have >> drawn, suppose that before the patch, we first mmap() the >> 8MB-start chunk. Then we mmap the 4MB start chunk. >> We go to __mmap_region(), and we see that the 8MB-start chunk >> has mergeable characteristics, so we merge. So the gap goes away? > No because there's a gap, we only merge immedaitely adjacent VMAs. And obviously > gaps mean page tables wouldn't be adjacent either... Ah shoot. That is prev->vm_end == vmg->start in can_vma_merge_left(). Thanks. > > The get_unmmaped_area() would have otherwise given adjacent mappings. Vlasta's > patch means in this case we no longer bother trying to align these because their > _length_ isn't PMD aligned.