| From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> |
| Subject: mm/vmemmap: allow architectures to override how vmemmap optimization works |
| Date: Tue, 25 Jul 2023 00:37:50 +0530 |
| |
| Architectures like powerpc will like to use different page table |
| allocators and mapping mechanisms to implement vmemmap optimization. |
| Similar to vmemmap_populate allow architectures to implement |
| vmemap_populate_compound_pages |
| |
| Link: https://lkml.kernel.org/r/20230724190759.483013-5-aneesh.kumar@linux.ibm.com |
| Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> |
| Cc: Catalin Marinas <catalin.marinas@arm.com> |
| Cc: Christophe Leroy <christophe.leroy@csgroup.eu> |
| Cc: Dan Williams <dan.j.williams@intel.com> |
| Cc: Joao Martins <joao.m.martins@oracle.com> |
| Cc: Michael Ellerman <mpe@ellerman.id.au> |
| Cc: Mike Kravetz <mike.kravetz@oracle.com> |
| Cc: Muchun Song <muchun.song@linux.dev> |
| Cc: Nicholas Piggin <npiggin@gmail.com> |
| Cc: Oscar Salvador <osalvador@suse.de> |
| Cc: Will Deacon <will@kernel.org> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| --- |
| |
| mm/sparse-vmemmap.c | 3 +++ |
| 1 file changed, 3 insertions(+) |
| |
| --- a/mm/sparse-vmemmap.c~mm-vmemmap-allow-architectures-to-override-how-vmemmap-optimization-works |
| +++ a/mm/sparse-vmemmap.c |
| @@ -358,6 +358,7 @@ int __meminit vmemmap_populate_hugepages |
| return 0; |
| } |
| |
| +#ifndef vmemmap_populate_compound_pages |
| /* |
| * For compound pages bigger than section size (e.g. x86 1G compound |
| * pages with 2M subsection size) fill the rest of sections as tail |
| @@ -446,6 +447,8 @@ static int __meminit vmemmap_populate_co |
| return 0; |
| } |
| |
| +#endif |
| + |
| struct page * __meminit __populate_section_memmap(unsigned long pfn, |
| unsigned long nr_pages, int nid, struct vmem_altmap *altmap, |
| struct dev_pagemap *pgmap) |
| _ |
