diff options
Diffstat (limited to 'mm/percpu-internal.h')
| -rw-r--r-- | mm/percpu-internal.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h index 2e9d9bcb6fa2..252ae9e960e0 100644 --- a/mm/percpu-internal.h +++ b/mm/percpu-internal.h @@ -4,6 +4,22 @@ #include <linux/types.h> #include <linux/percpu.h> +/* + * pcpu_block_md is the metadata block struct. + * Each chunk's bitmap is split into a number of full blocks. + * All units are in terms of bits. + */ +struct pcpu_block_md { + int contig_hint; /* contig hint for block */ + int contig_hint_start; /* block relative starting + position of the contig hint */ + int left_free; /* size of free space along + the left side of the block */ + int right_free; /* size of free space along + the right side of the block */ + int first_free; /* block position of first free */ +}; + struct pcpu_chunk { #ifdef CONFIG_PERCPU_STATS int nr_alloc; /* # of allocations */ @@ -17,6 +33,7 @@ struct pcpu_chunk { unsigned long *alloc_map; /* allocation map */ unsigned long *bound_map; /* boundary map */ + struct pcpu_block_md *md_blocks; /* metadata blocks */ void *data; /* chunk data */ int first_free; /* no free below this */ @@ -44,6 +61,18 @@ extern struct pcpu_chunk *pcpu_first_chunk; extern struct pcpu_chunk *pcpu_reserved_chunk; /** + * pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks + * @chunk: chunk of interest + * + * This conversion is from the number of physical pages that the chunk + * serves to the number of bitmap blocks used. + */ +static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk) +{ + return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE; +} + +/** * pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap * @pages: number of physical pages * |