diff options
Diffstat (limited to 'include/linux/percpu.h')
| -rw-r--r-- | include/linux/percpu.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/percpu.h b/include/linux/percpu.h index b7e6c98722d1..31795e619273 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -26,6 +26,18 @@ #define PCPU_MIN_ALLOC_SIZE (1 << PCPU_MIN_ALLOC_SHIFT) /* + * This determines the size of each metadata block. There are several subtle + * constraints around this constant. The reserved region must be a multiple of + * PCPU_BITMAP_BLOCK_SIZE. Additionally, PCPU_BITMAP_BLOCK_SIZE must be a + * multiple of PAGE_SIZE or PAGE_SIZE must be a multiple of + * PCPU_BITMAP_BLOCK_SIZE to align with the populated page map. The unit_size + * also has to be a multiple of PCPU_BITMAP_BLOCK_SIZE to ensure full blocks. + */ +#define PCPU_BITMAP_BLOCK_SIZE PAGE_SIZE +#define PCPU_BITMAP_BLOCK_BITS (PCPU_BITMAP_BLOCK_SIZE >> \ + PCPU_MIN_ALLOC_SHIFT) + +/* * Percpu allocator can serve percpu allocations before slab is * initialized which allows slab to depend on the percpu allocator. * The following two parameters decide how much resource to |