1#ifndef JEMALLOC_INTERNAL_BASE_STRUCTS_H
2#define JEMALLOC_INTERNAL_BASE_STRUCTS_H
3
4#include "jemalloc/internal/jemalloc_internal_types.h"
5#include "jemalloc/internal/mutex.h"
6#include "jemalloc/internal/sc.h"
7
8/* Embedded at the beginning of every block of base-managed virtual memory. */
9struct base_block_s {
10	/* Total size of block's virtual memory mapping. */
11	size_t		size;
12
13	/* Next block in list of base's blocks. */
14	base_block_t	*next;
15
16	/* Tracks unused trailing space. */
17	extent_t	extent;
18};
19
20struct base_s {
21	/* Associated arena's index within the arenas array. */
22	unsigned	ind;
23
24	/*
25	 * User-configurable extent hook functions.  Points to an
26	 * extent_hooks_t.
27	 */
28	atomic_p_t	extent_hooks;
29
30	/* Protects base_alloc() and base_stats_get() operations. */
31	malloc_mutex_t	mtx;
32
33	/* Using THP when true (metadata_thp auto mode). */
34	bool		auto_thp_switched;
35	/*
36	 * Most recent size class in the series of increasingly large base
37	 * extents.  Logarithmic spacing between subsequent allocations ensures
38	 * that the total number of distinct mappings remains small.
39	 */
40	pszind_t	pind_last;
41
42	/* Serial number generation state. */
43	size_t		extent_sn_next;
44
45	/* Chain of all blocks associated with base. */
46	base_block_t	*blocks;
47
48	/* Heap of extents that track unused trailing space within blocks. */
49	extent_heap_t	avail[SC_NSIZES];
50
51	/* Stats, only maintained if config_stats. */
52	size_t		allocated;
53	size_t		resident;
54	size_t		mapped;
55	/* Number of THP regions touched. */
56	size_t		n_thp;
57};
58
59#endif /* JEMALLOC_INTERNAL_BASE_STRUCTS_H */
60