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name : zsmalloc.h
 /*
 * 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
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