2 * zsmalloc memory allocator
4 * Copyright (C) 2011 Nitin Gupta
5 * Copyright (C) 2012, 2013 Minchan Kim
7 * This code is released using a dual license strategy: BSD/GPL
8 * You can choose the license that better fits your requirements.
10 * Released under the terms of 3-clause BSD License
11 * Released under the terms of GNU General Public License Version 2.0
17 #include <linux/types.h>
20 * zsmalloc mapping modes
22 * NOTE: These only make a difference when a mapped object spans pages.
23 * They also have no effect when PGTABLE_MAPPING is selected.
26 ZS_MM_RW
, /* normal read-write mapping */
27 ZS_MM_RO
, /* read-only (no copy-out at unmap time) */
28 ZS_MM_WO
/* write-only (no copy-in at map time) */
30 * NOTE: ZS_MM_WO should only be used for initializing new
31 * (uninitialized) allocations. Partial writes to already
32 * initialized allocations should use ZS_MM_RW to preserve the
37 struct zs_pool_stats
{
38 /* How many pages were migrated (freed) */
39 unsigned long pages_compacted
;
44 struct zs_pool
*zs_create_pool(const char *name
);
45 void zs_destroy_pool(struct zs_pool
*pool
);
47 unsigned long zs_malloc(struct zs_pool
*pool
, size_t size
, gfp_t flags
);
48 void zs_free(struct zs_pool
*pool
, unsigned long obj
);
50 void *zs_map_object(struct zs_pool
*pool
, unsigned long handle
,
52 void zs_unmap_object(struct zs_pool
*pool
, unsigned long handle
);
54 unsigned long zs_get_total_pages(struct zs_pool
*pool
);
55 unsigned long zs_compact(struct zs_pool
*pool
);
57 void zs_pool_stats(struct zs_pool
*pool
, struct zs_pool_stats
*stats
);