server-skynet-source-3rd-je.../include/jemalloc/internal/extent_structs.h
David Goldblatt 77cccac8cd Break up headers into constituent parts
This is part of a broader change to make header files better represent the
dependencies between one another (see
https://github.com/jemalloc/jemalloc/issues/533). It breaks up component headers
into smaller parts that can be made to have a simpler dependency graph.

For the autogenerated headers (smoothstep.h and size_classes.h), no splitting
was necessary, so I didn't add support to emit multiple headers.
2017-01-12 15:43:51 -08:00

85 lines
2.2 KiB
C

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