diff options
| author | Muchun Song <songmuchun@bytedance.com> | 2026-09-10 14:32:44 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-10-06 17:38:49 -0700 |
| commit | ed3a33cd73da485f9de4ecaeada5b5cf51c073ef (patch) | |
| tree | db06f139aeacc7ed7fb07e2ff151f918a43fad0c /include | |
| parent | 057847a7faa345b775d006d38dc42221ebe35907 (diff) | |
| download | linux-next-ed3a33cd73da485f9de4ecaeada5b5cf51c073ef.tar.gz linux-next-ed3a33cd73da485f9de4ecaeada5b5cf51c073ef.zip | |
mm/sparse-vmemmap: support section-based vmemmap accounting
section_nr_vmemmap_pages() can account ordinary sections and DAX sections,
but section-based vmemmap optimization stores the compound page order in
struct mem_section and retains a different number of vmemmap pages.
Teach section_nr_vmemmap_pages() to recognize section-based optimized
sections and calculate their vmemmap page count from the stored compound
page order and the HVO retained page count.
Link: https://lore.kernel.org/20260910063256.64386-6-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Qi Zheng <qi.zheng@linux.dev>
Cc: David Hildenbrand (Arm) <david@kernel.org>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmzone.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 738bf3d27256..2c4f63e379da 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -107,8 +107,10 @@ is_power_of_2(sizeof(struct page)) ? \ MAX_FOLIO_NR_PAGES * sizeof(struct page) : 0) -/* The number of struct pages covered by the retained vmemmap pages with HVO enabled. */ -#define VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES (PAGE_SIZE / sizeof(struct page)) +/* The number of retained vmemmap pages with HVO enabled. */ +#define VMEMMAP_OPTIMIZATION_PAGES 1 +#define VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES \ + (VMEMMAP_OPTIMIZATION_PAGES * PAGE_SIZE / sizeof(struct page)) #define VMEMMAP_OPTIMIZATION_MIN_ORDER (ilog2(VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES) + 1) #define __VMEMMAP_OPTIMIZATION_NR_ORDERS \ |