dmmlib/heap.h

#ifndef HEAP_H
#define HEAP_H

#include <stdint.h>
#include <pthread.h>

#include "block_header.h"

#define NUM_HEAPS 4

/**
 * A structure to represent a maptable node
 */
typedef struct maptable_node_s {
	unsigned int size; /**< the size of the blocks of the fixed list */
	void *fixed_list_head; /**< pointer to the head node of the fixed list */
	struct maptable_node_s *next; /**< pointer to the next node of the maptable */
} maptable_node_t;

typedef struct dmmstats_s {
	uint32_t max_mem_allocated; /**< maximum total memory allocated */
	uint32_t max_mem_requested; /**< maximum total memory requested */
	uint32_t mem_allocated; /**< total memory currently allocated */
	uint32_t mem_requested; /**< total memory currently requested */
	uint32_t mem_reserved; /**< total memory currently reserved */
	uint32_t live_objects; /**< number of live objects */
	uint32_t read_mem_accesses; /**< number of read accesses */
	uint32_t write_mem_accesses; /**< number of write accesses */
	uint32_t num_malloc; /**< number of malloc()'s served */
	uint32_t num_free; /**< number of free()'s served */
} dmmstats_t;

/**
 * A structure to represent tunable parameters of a heap
 */
typedef struct dmmknobs_s {
	int32_t max_coalesce_size; /**< maximum coalesce size; -1 if coalescing
				      is not supported */
	float frag_threshold; /**< fragmentation threshold to enable
					 coalescing or not */ 
	uint32_t mem_threshold; /**< memory size threshold */
	uint32_t min_split_size; // FIXME to be investigated if needed
	float empty_threshold; // FIXME to be investigated if needed
	uint32_t percentage; // FIXME to be investigated if needed
	char frag_state; //FIXME It was in the old code to refresh the frag check
} dmmknobs_t;

typedef struct heap_s {
	maptable_node_t *maptable_head;
	void *free_list_head;
	void *used_blocks_head;
	void *rov_ptr;
	uint64_t num_objects;
	dmmstats_t dmm_stats;
	dmmknobs_t dmm_knobs;
	pthread_mutex_t mutex;
} heap_t;

typedef struct allocator_s {
	heap_t heaps[NUM_HEAPS];
} allocator_t;

#endif /* HEAP_H */