1 #ifndef JEMALLOC_INTERNAL_PAGES_EXTERNS_H
2 #define JEMALLOC_INTERNAL_PAGES_EXTERNS_H
4 /* Page size. LG_PAGE is determined by the configure script. */
8 #define PAGE ((size_t)(1U << LG_PAGE))
9 #define PAGE_MASK ((size_t)(PAGE - 1))
10 /* Return the page base address for the page containing address a. */
11 #define PAGE_ADDR2BASE(a) \
12 ((void *)((uintptr_t)(a) & ~PAGE_MASK))
13 /* Return the smallest pagesize multiple that is >= s. */
14 #define PAGE_CEILING(s) \
15 (((s) + PAGE_MASK) & ~PAGE_MASK)
17 /* Huge page size. LG_HUGEPAGE is determined by the configure script. */
18 #define HUGEPAGE ((size_t)(1U << LG_HUGEPAGE))
19 #define HUGEPAGE_MASK ((size_t)(HUGEPAGE - 1))
20 /* Return the huge page base address for the huge page containing address a. */
21 #define HUGEPAGE_ADDR2BASE(a) \
22 ((void *)((uintptr_t)(a) & ~HUGEPAGE_MASK))
23 /* Return the smallest pagesize multiple that is >= s. */
24 #define HUGEPAGE_CEILING(s) \
25 (((s) + HUGEPAGE_MASK) & ~HUGEPAGE_MASK)
27 /* PAGES_CAN_PURGE_LAZY is defined if lazy purging is supported. */
28 #if defined(_WIN32) || defined(JEMALLOC_PURGE_MADVISE_FREE)
29 # define PAGES_CAN_PURGE_LAZY
32 * PAGES_CAN_PURGE_FORCED is defined if forced purging is supported.
34 * The only supported way to hard-purge on Windows is to decommit and then
35 * re-commit, but doing so is racy, and if re-commit fails it's a pain to
36 * propagate the "poisoned" memory state. Since we typically decommit as the
37 * next step after purging on Windows anyway, there's no point in adding such
40 #if !defined(_WIN32) && ((defined(JEMALLOC_PURGE_MADVISE_DONTNEED) && \
41 defined(JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS)) || \
42 defined(JEMALLOC_MAPS_COALESCE))
43 # define PAGES_CAN_PURGE_FORCED
46 static const bool pages_can_purge_lazy =
47 #ifdef PAGES_CAN_PURGE_LAZY
53 static const bool pages_can_purge_forced =
54 #ifdef PAGES_CAN_PURGE_FORCED
62 thp_mode_default = 0, /* Do not change hugepage settings. */
63 thp_mode_always = 1, /* Always set MADV_HUGEPAGE. */
64 thp_mode_never = 2, /* Always set MADV_NOHUGEPAGE. */
66 thp_mode_names_limit = 3, /* Used for option processing. */
67 thp_mode_not_supported = 3 /* No THP support detected. */
70 #define THP_MODE_DEFAULT thp_mode_default
71 extern thp_mode_t opt_thp;
72 extern thp_mode_t init_system_thp_mode; /* Initial system wide state. */
73 extern const char *thp_mode_names[];
75 void *pages_map(void *addr, size_t size, size_t alignment, bool *commit);
76 void pages_unmap(void *addr, size_t size);
77 bool pages_commit(void *addr, size_t size);
78 bool pages_decommit(void *addr, size_t size);
79 bool pages_purge_lazy(void *addr, size_t size);
80 bool pages_purge_forced(void *addr, size_t size);
81 bool pages_huge(void *addr, size_t size);
82 bool pages_nohuge(void *addr, size_t size);
83 bool pages_dontdump(void *addr, size_t size);
84 bool pages_dodump(void *addr, size_t size);
85 bool pages_boot(void);
86 void pages_set_thp_state (void *ptr, size_t size);
88 #endif /* JEMALLOC_INTERNAL_PAGES_EXTERNS_H */