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| author | Muchun Song <songmuchun@bytedance.com> | 2026-09-10 14:32:41 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-10-06 17:38:48 -0700 |
| commit | 5e72deef11ba2d9110e3e4f1d9b2edf9e46495bb (patch) | |
| tree | 31ff136ce65aa79925150b1fd8a6c7e8532e959a /include | |
| parent | 48070b721a60c29c5a801cee8b9053c729e71eca (diff) | |
| download | linux-next-5e72deef11ba2d9110e3e4f1d9b2edf9e46495bb.tar.gz linux-next-5e72deef11ba2d9110e3e4f1d9b2edf9e46495bb.zip | |
mm/sparse-vmemmap: rename HVO order macros
The macros VMEMMAP_TAIL_MIN_ORDER and NR_VMEMMAP_TAILS describe the order
range where HVO can be applied, but their names tie that range to the
tail-page cache implementation.
Rename them with a VMEMMAP_OPTIMIZATION prefix and use the new names in
the HVO paths. This makes the code describe the optimization requirements
rather than the tail-page cache implementation detail.
No functional change intended.
Link: https://lore.kernel.org/20260910063256.64386-3-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 | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 0a2428714108..5fb9b37819d5 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -107,13 +107,14 @@ is_power_of_2(sizeof(struct page)) ? \ MAX_FOLIO_NR_PAGES * sizeof(struct page) : 0) -/* - * vmemmap optimization (like HVO) is only possible for page orders that fill - * two or more pages with struct pages. - */ -#define VMEMMAP_TAIL_MIN_ORDER (ilog2(2 * PAGE_SIZE / sizeof(struct page))) -#define __NR_VMEMMAP_TAILS (MAX_FOLIO_ORDER - VMEMMAP_TAIL_MIN_ORDER + 1) -#define NR_VMEMMAP_TAILS (__NR_VMEMMAP_TAILS > 0 ? __NR_VMEMMAP_TAILS : 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)) +#define VMEMMAP_OPTIMIZATION_MIN_ORDER (ilog2(VMEMMAP_OPTIMIZATION_NR_STRUCT_PAGES) + 1) + +#define __VMEMMAP_OPTIMIZATION_NR_ORDERS \ + (MAX_FOLIO_ORDER - VMEMMAP_OPTIMIZATION_MIN_ORDER + 1) +#define VMEMMAP_OPTIMIZATION_NR_ORDERS \ + (__VMEMMAP_OPTIMIZATION_NR_ORDERS > 0 ? __VMEMMAP_OPTIMIZATION_NR_ORDERS : 0) enum migratetype { MIGRATE_UNMOVABLE, @@ -1158,7 +1159,7 @@ struct zone { atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; atomic_long_t vm_numa_event[NR_VM_NUMA_EVENT_ITEMS]; #ifdef CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP - struct page *vmemmap_tails[NR_VMEMMAP_TAILS]; + struct page *vmemmap_tails[VMEMMAP_OPTIMIZATION_NR_ORDERS]; #endif } ____cacheline_internodealigned_in_smp; |