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/size_classes.h"
7 
8 /* Embedded at the beginning of every block of base-managed virtual memory. */
9 struct 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 
20 struct 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[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