diff options
Diffstat (limited to 'include/linux/zsmalloc.h')
-rw-r--r-- | include/linux/zsmalloc.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h new file mode 100644 index 000000000..a48cd0ffe --- /dev/null +++ b/include/linux/zsmalloc.h @@ -0,0 +1,61 @@ +/* + * zsmalloc memory allocator + * + * Copyright (C) 2011 Nitin Gupta + * Copyright (C) 2012, 2013 Minchan Kim + * + * This code is released using a dual license strategy: BSD/GPL + * You can choose the license that better fits your requirements. + * + * Released under the terms of 3-clause BSD License + * Released under the terms of GNU General Public License Version 2.0 + */ + +#ifndef _ZS_MALLOC_H_ +#define _ZS_MALLOC_H_ + +#include <linux/types.h> + +/* + * zsmalloc mapping modes + * + * NOTE: These only make a difference when a mapped object spans pages. + */ +enum zs_mapmode { + ZS_MM_RW, /* normal read-write mapping */ + ZS_MM_RO, /* read-only (no copy-out at unmap time) */ + ZS_MM_WO /* write-only (no copy-in at map time) */ + /* + * NOTE: ZS_MM_WO should only be used for initializing new + * (uninitialized) allocations. Partial writes to already + * initialized allocations should use ZS_MM_RW to preserve the + * existing data. + */ +}; + +struct zs_pool_stats { + /* How many pages were migrated (freed) */ + atomic_long_t pages_compacted; +}; + +struct zs_pool; + +struct zs_pool *zs_create_pool(const char *name); +void zs_destroy_pool(struct zs_pool *pool); + +unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags); +void zs_free(struct zs_pool *pool, unsigned long obj); + +size_t zs_huge_class_size(struct zs_pool *pool); + +void *zs_map_object(struct zs_pool *pool, unsigned long handle, + enum zs_mapmode mm); +void zs_unmap_object(struct zs_pool *pool, unsigned long handle); + +unsigned long zs_get_total_pages(struct zs_pool *pool); +unsigned long zs_compact(struct zs_pool *pool); + +unsigned int zs_lookup_class_index(struct zs_pool *pool, unsigned int size); + +void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats); +#endif |