120 lines
3.9 KiB
C
120 lines
3.9 KiB
C
#ifndef JEMALLOC_INTERNAL_PAGES_EXTERNS_H
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#define JEMALLOC_INTERNAL_PAGES_EXTERNS_H
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/* Page size. LG_PAGE is determined by the configure script. */
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#ifdef PAGE_MASK
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# undef PAGE_MASK
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#endif
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#define PAGE ((size_t)(1U << LG_PAGE))
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#define PAGE_MASK ((size_t)(PAGE - 1))
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/* Return the page base address for the page containing address a. */
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#define PAGE_ADDR2BASE(a) \
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((void *)((uintptr_t)(a) & ~PAGE_MASK))
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/* Return the smallest pagesize multiple that is >= s. */
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#define PAGE_CEILING(s) \
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(((s) + PAGE_MASK) & ~PAGE_MASK)
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/* Return the largest pagesize multiple that is <=s. */
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#define PAGE_FLOOR(s) \
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((s) & ~PAGE_MASK)
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/* Huge page size. LG_HUGEPAGE is determined by the configure script. */
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#define HUGEPAGE ((size_t)(1U << LG_HUGEPAGE))
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#define HUGEPAGE_MASK ((size_t)(HUGEPAGE - 1))
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#if LG_HUGEPAGE != 0
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# define HUGEPAGE_PAGES (HUGEPAGE / PAGE)
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#else
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/*
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* It's convenient to define arrays (or bitmaps) of HUGEPAGE_PAGES lengths. If
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* we can't autodetect the hugepage size, it gets treated as 0, in which case
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* we'll trigger a compiler error in those arrays. Avoid this case by ensuring
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* that this value is at least 1. (We won't ever run in this degraded state;
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* hpa_supported() returns false in this case.
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*/
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# define HUGEPAGE_PAGES 1
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#endif
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/* Return the huge page base address for the huge page containing address a. */
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#define HUGEPAGE_ADDR2BASE(a) \
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((void *)((uintptr_t)(a) & ~HUGEPAGE_MASK))
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/* Return the smallest pagesize multiple that is >= s. */
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#define HUGEPAGE_CEILING(s) \
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(((s) + HUGEPAGE_MASK) & ~HUGEPAGE_MASK)
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/* PAGES_CAN_PURGE_LAZY is defined if lazy purging is supported. */
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#if defined(_WIN32) || defined(JEMALLOC_PURGE_MADVISE_FREE)
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# define PAGES_CAN_PURGE_LAZY
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#endif
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/*
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* PAGES_CAN_PURGE_FORCED is defined if forced purging is supported.
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*
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* The only supported way to hard-purge on Windows is to decommit and then
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* re-commit, but doing so is racy, and if re-commit fails it's a pain to
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* propagate the "poisoned" memory state. Since we typically decommit as the
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* next step after purging on Windows anyway, there's no point in adding such
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* complexity.
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*/
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#if !defined(_WIN32) && ((defined(JEMALLOC_PURGE_MADVISE_DONTNEED) && \
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defined(JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS)) || \
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defined(JEMALLOC_MAPS_COALESCE))
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# define PAGES_CAN_PURGE_FORCED
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#endif
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static const bool pages_can_purge_lazy =
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#ifdef PAGES_CAN_PURGE_LAZY
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true
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#else
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false
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#endif
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;
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static const bool pages_can_purge_forced =
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#ifdef PAGES_CAN_PURGE_FORCED
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true
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#else
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false
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#endif
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;
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#if defined(JEMALLOC_HAVE_MADVISE_HUGE) || defined(JEMALLOC_HAVE_MEMCNTL)
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# define PAGES_CAN_HUGIFY
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#endif
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static const bool pages_can_hugify =
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#ifdef PAGES_CAN_HUGIFY
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true
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#else
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false
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#endif
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;
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typedef enum {
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thp_mode_default = 0, /* Do not change hugepage settings. */
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thp_mode_always = 1, /* Always set MADV_HUGEPAGE. */
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thp_mode_never = 2, /* Always set MADV_NOHUGEPAGE. */
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thp_mode_names_limit = 3, /* Used for option processing. */
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thp_mode_not_supported = 3 /* No THP support detected. */
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} thp_mode_t;
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#define THP_MODE_DEFAULT thp_mode_default
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extern thp_mode_t opt_thp;
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extern thp_mode_t init_system_thp_mode; /* Initial system wide state. */
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extern const char *thp_mode_names[];
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void *pages_map(void *addr, size_t size, size_t alignment, bool *commit);
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void pages_unmap(void *addr, size_t size);
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bool pages_commit(void *addr, size_t size);
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bool pages_decommit(void *addr, size_t size);
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bool pages_purge_lazy(void *addr, size_t size);
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bool pages_purge_forced(void *addr, size_t size);
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bool pages_huge(void *addr, size_t size);
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bool pages_nohuge(void *addr, size_t size);
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bool pages_dontdump(void *addr, size_t size);
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bool pages_dodump(void *addr, size_t size);
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bool pages_boot(void);
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void pages_set_thp_state (void *ptr, size_t size);
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void pages_mark_guards(void *head, void *tail);
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void pages_unmark_guards(void *head, void *tail);
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#endif /* JEMALLOC_INTERNAL_PAGES_EXTERNS_H */
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