85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
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#ifndef JEMALLOC_INTERNAL_EXTENT_STRUCTS_H
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#define JEMALLOC_INTERNAL_EXTENT_STRUCTS_H
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/* Extent (span of pages). Use accessor functions for e_* fields. */
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struct extent_s {
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/* Arena from which this extent came, if any. */
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arena_t *e_arena;
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/* Pointer to the extent that this structure is responsible for. */
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void *e_addr;
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/* Extent size. */
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size_t e_size;
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/*
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* Usable size, typically smaller than extent size due to large_pad or
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* promotion of sampled small regions.
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*/
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size_t e_usize;
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/*
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* Serial number (potentially non-unique).
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*
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* In principle serial numbers can wrap around on 32-bit systems if
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* JEMALLOC_MUNMAP is defined, but as long as comparison functions fall
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* back on address comparison for equal serial numbers, stable (if
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* imperfect) ordering is maintained.
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*
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* Serial numbers may not be unique even in the absence of wrap-around,
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* e.g. when splitting an extent and assigning the same serial number to
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* both resulting adjacent extents.
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*/
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size_t e_sn;
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/* True if extent is active (in use). */
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bool e_active;
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/*
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* The zeroed flag is used by extent recycling code to track whether
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* memory is zero-filled.
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*/
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bool e_zeroed;
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/*
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* True if physical memory is committed to the extent, whether
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* explicitly or implicitly as on a system that overcommits and
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* satisfies physical memory needs on demand via soft page faults.
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*/
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bool e_committed;
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/*
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* The slab flag indicates whether the extent is used for a slab of
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* small regions. This helps differentiate small size classes, and it
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* indicates whether interior pointers can be looked up via iealloc().
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*/
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bool e_slab;
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union {
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/* Small region slab metadata. */
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arena_slab_data_t e_slab_data;
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/* Profile counters, used for large objects. */
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union {
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void *e_prof_tctx_pun;
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prof_tctx_t *e_prof_tctx;
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};
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};
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/*
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* Linkage for arena's extents_dirty and arena_bin_t's slabs_full rings.
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*/
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qr(extent_t) qr_link;
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union {
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/* Linkage for per size class sn/address-ordered heaps. */
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phn(extent_t) ph_link;
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/* Linkage for arena's large and extent_cache lists. */
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ql_elm(extent_t) ql_link;
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};
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};
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typedef ph(extent_t) extent_heap_t;
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#endif /* JEMALLOC_INTERNAL_EXTENT_STRUCTS_H */
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