be8e59f5a6
When you call free() we load chunk->arena even though that data isn't used on the tcache hot path. In profiling some FB applications, I found that ~30% of the dTLB misses in the free() function come from this line. With 4 MB chunks, the arena_chunk_t->map is ~ 32 KB (1024 pages in the chunk, 4 8 byte pointers in arena_chunk_map_t). This means there's only a 1/8 chance of the page containing chunk->arena also comtaining the map bits.
1061 lines
33 KiB
C
1061 lines
33 KiB
C
/******************************************************************************/
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#ifdef JEMALLOC_H_TYPES
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/*
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* RUN_MAX_OVRHD indicates maximum desired run header overhead. Runs are sized
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* as small as possible such that this setting is still honored, without
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* violating other constraints. The goal is to make runs as small as possible
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* without exceeding a per run external fragmentation threshold.
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*
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* We use binary fixed point math for overhead computations, where the binary
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* point is implicitly RUN_BFP bits to the left.
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*
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* Note that it is possible to set RUN_MAX_OVRHD low enough that it cannot be
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* honored for some/all object sizes, since when heap profiling is enabled
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* there is one pointer of header overhead per object (plus a constant). This
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* constraint is relaxed (ignored) for runs that are so small that the
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* per-region overhead is greater than:
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*
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* (RUN_MAX_OVRHD / (reg_interval << (3+RUN_BFP))
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*/
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#define RUN_BFP 12
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/* \/ Implicit binary fixed point. */
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#define RUN_MAX_OVRHD 0x0000003dU
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#define RUN_MAX_OVRHD_RELAX 0x00001800U
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/* Maximum number of regions in one run. */
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#define LG_RUN_MAXREGS 11
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#define RUN_MAXREGS (1U << LG_RUN_MAXREGS)
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/*
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* Minimum redzone size. Redzones may be larger than this if necessary to
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* preserve region alignment.
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*/
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#define REDZONE_MINSIZE 16
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/*
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* The minimum ratio of active:dirty pages per arena is computed as:
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*
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* (nactive >> opt_lg_dirty_mult) >= ndirty
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*
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* So, supposing that opt_lg_dirty_mult is 3, there can be no less than 8 times
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* as many active pages as dirty pages.
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*/
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#define LG_DIRTY_MULT_DEFAULT 3
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typedef struct arena_chunk_map_s arena_chunk_map_t;
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typedef struct arena_chunk_s arena_chunk_t;
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typedef struct arena_run_s arena_run_t;
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typedef struct arena_bin_info_s arena_bin_info_t;
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typedef struct arena_bin_s arena_bin_t;
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typedef struct arena_s arena_t;
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#endif /* JEMALLOC_H_TYPES */
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/******************************************************************************/
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#ifdef JEMALLOC_H_STRUCTS
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/* Each element of the chunk map corresponds to one page within the chunk. */
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struct arena_chunk_map_s {
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#ifndef JEMALLOC_PROF
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/*
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* Overlay prof_ctx in order to allow it to be referenced by dead code.
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* Such antics aren't warranted for per arena data structures, but
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* chunk map overhead accounts for a percentage of memory, rather than
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* being just a fixed cost.
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*/
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union {
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#endif
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union {
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/*
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* Linkage for run trees. There are two disjoint uses:
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*
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* 1) arena_t's runs_avail tree.
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* 2) arena_run_t conceptually uses this linkage for in-use
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* non-full runs, rather than directly embedding linkage.
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*/
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rb_node(arena_chunk_map_t) rb_link;
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/*
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* List of runs currently in purgatory. arena_chunk_purge()
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* temporarily allocates runs that contain dirty pages while
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* purging, so that other threads cannot use the runs while the
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* purging thread is operating without the arena lock held.
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*/
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ql_elm(arena_chunk_map_t) ql_link;
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} u;
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/* Profile counters, used for large object runs. */
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prof_ctx_t *prof_ctx;
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#ifndef JEMALLOC_PROF
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}; /* union { ... }; */
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#endif
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/*
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* Run address (or size) and various flags are stored together. The bit
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* layout looks like (assuming 32-bit system):
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*
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* ???????? ???????? ????nnnn nnnndula
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*
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* ? : Unallocated: Run address for first/last pages, unset for internal
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* pages.
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* Small: Run page offset.
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* Large: Run size for first page, unset for trailing pages.
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* n : binind for small size class, BININD_INVALID for large size class.
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* d : dirty?
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* u : unzeroed?
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* l : large?
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* a : allocated?
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*
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* Following are example bit patterns for the three types of runs.
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*
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* p : run page offset
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* s : run size
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* n : binind for size class; large objects set these to BININD_INVALID
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* except for promoted allocations (see prof_promote)
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* x : don't care
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* - : 0
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* + : 1
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* [DULA] : bit set
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* [dula] : bit unset
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*
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* Unallocated (clean):
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* ssssssss ssssssss ssss++++ ++++du-a
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* xxxxxxxx xxxxxxxx xxxxxxxx xxxx-Uxx
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* ssssssss ssssssss ssss++++ ++++dU-a
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*
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* Unallocated (dirty):
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* ssssssss ssssssss ssss++++ ++++D--a
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* xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
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* ssssssss ssssssss ssss++++ ++++D--a
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*
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* Small:
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* pppppppp pppppppp ppppnnnn nnnnd--A
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* pppppppp pppppppp ppppnnnn nnnn---A
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* pppppppp pppppppp ppppnnnn nnnnd--A
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*
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* Large:
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* ssssssss ssssssss ssss++++ ++++D-LA
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* xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx
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* -------- -------- ----++++ ++++D-LA
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*
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* Large (sampled, size <= PAGE):
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* ssssssss ssssssss ssssnnnn nnnnD-LA
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*
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* Large (not sampled, size == PAGE):
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* ssssssss ssssssss ssss++++ ++++D-LA
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*/
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size_t bits;
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#define CHUNK_MAP_BININD_SHIFT 4
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#define BININD_INVALID ((size_t)0xffU)
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/* CHUNK_MAP_BININD_MASK == (BININD_INVALID << CHUNK_MAP_BININD_SHIFT) */
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#define CHUNK_MAP_BININD_MASK ((size_t)0xff0U)
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#define CHUNK_MAP_BININD_INVALID CHUNK_MAP_BININD_MASK
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#define CHUNK_MAP_FLAGS_MASK ((size_t)0xcU)
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#define CHUNK_MAP_DIRTY ((size_t)0x8U)
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#define CHUNK_MAP_UNZEROED ((size_t)0x4U)
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#define CHUNK_MAP_LARGE ((size_t)0x2U)
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#define CHUNK_MAP_ALLOCATED ((size_t)0x1U)
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#define CHUNK_MAP_KEY CHUNK_MAP_ALLOCATED
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};
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typedef rb_tree(arena_chunk_map_t) arena_avail_tree_t;
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typedef rb_tree(arena_chunk_map_t) arena_run_tree_t;
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typedef ql_head(arena_chunk_map_t) arena_chunk_mapelms_t;
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/* Arena chunk header. */
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struct arena_chunk_s {
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/* Arena that owns the chunk. */
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arena_t *arena;
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/* Linkage for tree of arena chunks that contain dirty runs. */
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rb_node(arena_chunk_t) dirty_link;
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/* Number of dirty pages. */
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size_t ndirty;
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/* Number of available runs. */
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size_t nruns_avail;
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/*
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* Number of available run adjacencies that purging could coalesce.
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* Clean and dirty available runs are not coalesced, which causes
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* virtual memory fragmentation. The ratio of
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* (nruns_avail-nruns_adjac):nruns_adjac is used for tracking this
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* fragmentation.
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*/
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size_t nruns_adjac;
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/*
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* Map of pages within chunk that keeps track of free/large/small. The
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* first map_bias entries are omitted, since the chunk header does not
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* need to be tracked in the map. This omission saves a header page
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* for common chunk sizes (e.g. 4 MiB).
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*/
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arena_chunk_map_t map[1]; /* Dynamically sized. */
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};
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typedef rb_tree(arena_chunk_t) arena_chunk_tree_t;
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struct arena_run_s {
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/* Bin this run is associated with. */
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arena_bin_t *bin;
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/* Index of next region that has never been allocated, or nregs. */
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uint32_t nextind;
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/* Number of free regions in run. */
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unsigned nfree;
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};
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/*
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* Read-only information associated with each element of arena_t's bins array
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* is stored separately, partly to reduce memory usage (only one copy, rather
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* than one per arena), but mainly to avoid false cacheline sharing.
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*
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* Each run has the following layout:
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*
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* /--------------------\
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* | arena_run_t header |
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* | ... |
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* bitmap_offset | bitmap |
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* | ... |
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* ctx0_offset | ctx map |
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* | ... |
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* |--------------------|
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* | redzone |
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* reg0_offset | region 0 |
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* | redzone |
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* |--------------------| \
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* | redzone | |
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* | region 1 | > reg_interval
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* | redzone | /
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* |--------------------|
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* | ... |
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* | ... |
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* | ... |
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* |--------------------|
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* | redzone |
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* | region nregs-1 |
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* | redzone |
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* |--------------------|
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* | alignment pad? |
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* \--------------------/
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*
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* reg_interval has at least the same minimum alignment as reg_size; this
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* preserves the alignment constraint that sa2u() depends on. Alignment pad is
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* either 0 or redzone_size; it is present only if needed to align reg0_offset.
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*/
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struct arena_bin_info_s {
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/* Size of regions in a run for this bin's size class. */
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size_t reg_size;
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/* Redzone size. */
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size_t redzone_size;
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/* Interval between regions (reg_size + (redzone_size << 1)). */
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size_t reg_interval;
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/* Total size of a run for this bin's size class. */
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size_t run_size;
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/* Total number of regions in a run for this bin's size class. */
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uint32_t nregs;
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/*
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* Offset of first bitmap_t element in a run header for this bin's size
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* class.
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*/
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uint32_t bitmap_offset;
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/*
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* Metadata used to manipulate bitmaps for runs associated with this
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* bin.
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*/
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bitmap_info_t bitmap_info;
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/*
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* Offset of first (prof_ctx_t *) in a run header for this bin's size
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* class, or 0 if (config_prof == false || opt_prof == false).
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*/
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uint32_t ctx0_offset;
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/* Offset of first region in a run for this bin's size class. */
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uint32_t reg0_offset;
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};
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struct arena_bin_s {
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/*
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* All operations on runcur, runs, and stats require that lock be
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* locked. Run allocation/deallocation are protected by the arena lock,
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* which may be acquired while holding one or more bin locks, but not
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* vise versa.
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*/
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malloc_mutex_t lock;
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/*
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* Current run being used to service allocations of this bin's size
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* class.
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*/
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arena_run_t *runcur;
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/*
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* Tree of non-full runs. This tree is used when looking for an
|
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* existing run when runcur is no longer usable. We choose the
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* non-full run that is lowest in memory; this policy tends to keep
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* objects packed well, and it can also help reduce the number of
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* almost-empty chunks.
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*/
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arena_run_tree_t runs;
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/* Bin statistics. */
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malloc_bin_stats_t stats;
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};
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|
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struct arena_s {
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/* This arena's index within the arenas array. */
|
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unsigned ind;
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|
|
/*
|
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* Number of threads currently assigned to this arena. This field is
|
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* protected by arenas_lock.
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*/
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unsigned nthreads;
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|
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/*
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* There are three classes of arena operations from a locking
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* perspective:
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* 1) Thread asssignment (modifies nthreads) is protected by
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* arenas_lock.
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* 2) Bin-related operations are protected by bin locks.
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* 3) Chunk- and run-related operations are protected by this mutex.
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*/
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malloc_mutex_t lock;
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arena_stats_t stats;
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/*
|
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* List of tcaches for extant threads associated with this arena.
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* Stats from these are merged incrementally, and at exit.
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*/
|
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ql_head(tcache_t) tcache_ql;
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uint64_t prof_accumbytes;
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|
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dss_prec_t dss_prec;
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|
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/* Tree of dirty-page-containing chunks this arena manages. */
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arena_chunk_tree_t chunks_dirty;
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|
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/*
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* In order to avoid rapid chunk allocation/deallocation when an arena
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* oscillates right on the cusp of needing a new chunk, cache the most
|
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* recently freed chunk. The spare is left in the arena's chunk trees
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* until it is deleted.
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*
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* There is one spare chunk per arena, rather than one spare total, in
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* order to avoid interactions between multiple threads that could make
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* a single spare inadequate.
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*/
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arena_chunk_t *spare;
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|
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/* Number of pages in active runs. */
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size_t nactive;
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|
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/*
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* Current count of pages within unused runs that are potentially
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* dirty, and for which madvise(... MADV_DONTNEED) has not been called.
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* By tracking this, we can institute a limit on how much dirty unused
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* memory is mapped for each arena.
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*/
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size_t ndirty;
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/*
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* Approximate number of pages being purged. It is possible for
|
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* multiple threads to purge dirty pages concurrently, and they use
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* npurgatory to indicate the total number of pages all threads are
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* attempting to purge.
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*/
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size_t npurgatory;
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|
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/*
|
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* Size/address-ordered trees of this arena's available runs. The trees
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* are used for first-best-fit run allocation.
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*/
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arena_avail_tree_t runs_avail;
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/* bins is used to store trees of free regions. */
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arena_bin_t bins[NBINS];
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};
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|
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#endif /* JEMALLOC_H_STRUCTS */
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/******************************************************************************/
|
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#ifdef JEMALLOC_H_EXTERNS
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extern ssize_t opt_lg_dirty_mult;
|
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/*
|
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* small_size2bin is a compact lookup table that rounds request sizes up to
|
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* size classes. In order to reduce cache footprint, the table is compressed,
|
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* and all accesses are via the SMALL_SIZE2BIN macro.
|
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*/
|
|
extern uint8_t const small_size2bin[];
|
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#define SMALL_SIZE2BIN(s) (small_size2bin[(s-1) >> LG_TINY_MIN])
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|
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extern arena_bin_info_t arena_bin_info[NBINS];
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|
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/* Number of large size classes. */
|
|
#define nlclasses (chunk_npages - map_bias)
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|
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void arena_purge_all(arena_t *arena);
|
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void arena_tcache_fill_small(arena_t *arena, tcache_bin_t *tbin,
|
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size_t binind, uint64_t prof_accumbytes);
|
|
void arena_alloc_junk_small(void *ptr, arena_bin_info_t *bin_info,
|
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bool zero);
|
|
#ifdef JEMALLOC_JET
|
|
typedef void (arena_redzone_corruption_t)(void *, size_t, bool, size_t,
|
|
uint8_t);
|
|
extern arena_redzone_corruption_t *arena_redzone_corruption;
|
|
typedef void (arena_dalloc_junk_small_t)(void *, arena_bin_info_t *);
|
|
extern arena_dalloc_junk_small_t *arena_dalloc_junk_small;
|
|
#else
|
|
void arena_dalloc_junk_small(void *ptr, arena_bin_info_t *bin_info);
|
|
#endif
|
|
void arena_quarantine_junk_small(void *ptr, size_t usize);
|
|
void *arena_malloc_small(arena_t *arena, size_t size, bool zero);
|
|
void *arena_malloc_large(arena_t *arena, size_t size, bool zero);
|
|
void *arena_palloc(arena_t *arena, size_t size, size_t alignment, bool zero);
|
|
void arena_prof_promoted(const void *ptr, size_t size);
|
|
void arena_dalloc_bin_locked(arena_t *arena, arena_chunk_t *chunk, void *ptr,
|
|
arena_chunk_map_t *mapelm);
|
|
void arena_dalloc_bin(arena_t *arena, arena_chunk_t *chunk, void *ptr,
|
|
size_t pageind, arena_chunk_map_t *mapelm);
|
|
void arena_dalloc_small(arena_t *arena, arena_chunk_t *chunk, void *ptr,
|
|
size_t pageind);
|
|
#ifdef JEMALLOC_JET
|
|
typedef void (arena_dalloc_junk_large_t)(void *, size_t);
|
|
extern arena_dalloc_junk_large_t *arena_dalloc_junk_large;
|
|
#endif
|
|
void arena_dalloc_large_locked(arena_t *arena, arena_chunk_t *chunk,
|
|
void *ptr);
|
|
void arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk, void *ptr);
|
|
#ifdef JEMALLOC_JET
|
|
typedef void (arena_ralloc_junk_large_t)(void *, size_t, size_t);
|
|
extern arena_ralloc_junk_large_t *arena_ralloc_junk_large;
|
|
#endif
|
|
bool arena_ralloc_no_move(void *ptr, size_t oldsize, size_t size,
|
|
size_t extra, bool zero);
|
|
void *arena_ralloc(arena_t *arena, void *ptr, size_t oldsize, size_t size,
|
|
size_t extra, size_t alignment, bool zero, bool try_tcache_alloc,
|
|
bool try_tcache_dalloc);
|
|
dss_prec_t arena_dss_prec_get(arena_t *arena);
|
|
void arena_dss_prec_set(arena_t *arena, dss_prec_t dss_prec);
|
|
void arena_stats_merge(arena_t *arena, const char **dss, size_t *nactive,
|
|
size_t *ndirty, arena_stats_t *astats, malloc_bin_stats_t *bstats,
|
|
malloc_large_stats_t *lstats);
|
|
bool arena_new(arena_t *arena, unsigned ind);
|
|
void arena_boot(void);
|
|
void arena_prefork(arena_t *arena);
|
|
void arena_postfork_parent(arena_t *arena);
|
|
void arena_postfork_child(arena_t *arena);
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|
|
|
#endif /* JEMALLOC_H_EXTERNS */
|
|
/******************************************************************************/
|
|
#ifdef JEMALLOC_H_INLINES
|
|
|
|
#ifndef JEMALLOC_ENABLE_INLINE
|
|
arena_chunk_map_t *arena_mapp_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t *arena_mapbitsp_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbitsp_read(size_t *mapbitsp);
|
|
size_t arena_mapbits_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_unallocated_size_get(arena_chunk_t *chunk,
|
|
size_t pageind);
|
|
size_t arena_mapbits_large_size_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_small_runind_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_binind_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_dirty_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_unzeroed_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_large_get(arena_chunk_t *chunk, size_t pageind);
|
|
size_t arena_mapbits_allocated_get(arena_chunk_t *chunk, size_t pageind);
|
|
void arena_mapbitsp_write(size_t *mapbitsp, size_t mapbits);
|
|
void arena_mapbits_unallocated_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t size, size_t flags);
|
|
void arena_mapbits_unallocated_size_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t size);
|
|
void arena_mapbits_large_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t size, size_t flags);
|
|
void arena_mapbits_large_binind_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t binind);
|
|
void arena_mapbits_small_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t runind, size_t binind, size_t flags);
|
|
void arena_mapbits_unzeroed_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t unzeroed);
|
|
bool arena_prof_accum_impl(arena_t *arena, uint64_t accumbytes);
|
|
bool arena_prof_accum_locked(arena_t *arena, uint64_t accumbytes);
|
|
bool arena_prof_accum(arena_t *arena, uint64_t accumbytes);
|
|
size_t arena_ptr_small_binind_get(const void *ptr, size_t mapbits);
|
|
size_t arena_bin_index(arena_t *arena, arena_bin_t *bin);
|
|
unsigned arena_run_regind(arena_run_t *run, arena_bin_info_t *bin_info,
|
|
const void *ptr);
|
|
prof_ctx_t *arena_prof_ctx_get(const void *ptr);
|
|
void arena_prof_ctx_set(const void *ptr, size_t usize, prof_ctx_t *ctx);
|
|
void *arena_malloc(arena_t *arena, size_t size, bool zero, bool try_tcache);
|
|
size_t arena_salloc(const void *ptr, bool demote);
|
|
void arena_dalloc(arena_chunk_t *chunk, void *ptr, bool try_tcache);
|
|
#endif
|
|
|
|
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_ARENA_C_))
|
|
# ifdef JEMALLOC_ARENA_INLINE_A
|
|
JEMALLOC_ALWAYS_INLINE arena_chunk_map_t *
|
|
arena_mapp_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
|
|
assert(pageind >= map_bias);
|
|
assert(pageind < chunk_npages);
|
|
|
|
return (&chunk->map[pageind-map_bias]);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t *
|
|
arena_mapbitsp_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
|
|
return (&arena_mapp_get(chunk, pageind)->bits);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbitsp_read(size_t *mapbitsp)
|
|
{
|
|
|
|
return (*mapbitsp);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
|
|
return (arena_mapbitsp_read(arena_mapbitsp_get(chunk, pageind)));
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_unallocated_size_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
assert((mapbits & (CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED)) == 0);
|
|
return (mapbits & ~PAGE_MASK);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_large_size_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
assert((mapbits & (CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED)) ==
|
|
(CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED));
|
|
return (mapbits & ~PAGE_MASK);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_small_runind_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
assert((mapbits & (CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED)) ==
|
|
CHUNK_MAP_ALLOCATED);
|
|
return (mapbits >> LG_PAGE);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_binind_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
size_t binind;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
binind = (mapbits & CHUNK_MAP_BININD_MASK) >> CHUNK_MAP_BININD_SHIFT;
|
|
assert(binind < NBINS || binind == BININD_INVALID);
|
|
return (binind);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_dirty_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
return (mapbits & CHUNK_MAP_DIRTY);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_unzeroed_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
return (mapbits & CHUNK_MAP_UNZEROED);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_large_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
return (mapbits & CHUNK_MAP_LARGE);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_mapbits_allocated_get(arena_chunk_t *chunk, size_t pageind)
|
|
{
|
|
size_t mapbits;
|
|
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
return (mapbits & CHUNK_MAP_ALLOCATED);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbitsp_write(size_t *mapbitsp, size_t mapbits)
|
|
{
|
|
|
|
*mapbitsp = mapbits;
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbits_unallocated_set(arena_chunk_t *chunk, size_t pageind, size_t size,
|
|
size_t flags)
|
|
{
|
|
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
|
|
|
|
assert((size & PAGE_MASK) == 0);
|
|
assert((flags & ~CHUNK_MAP_FLAGS_MASK) == 0);
|
|
assert((flags & (CHUNK_MAP_DIRTY|CHUNK_MAP_UNZEROED)) == flags);
|
|
arena_mapbitsp_write(mapbitsp, size | CHUNK_MAP_BININD_INVALID | flags);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbits_unallocated_size_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t size)
|
|
{
|
|
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
|
|
size_t mapbits = arena_mapbitsp_read(mapbitsp);
|
|
|
|
assert((size & PAGE_MASK) == 0);
|
|
assert((mapbits & (CHUNK_MAP_LARGE|CHUNK_MAP_ALLOCATED)) == 0);
|
|
arena_mapbitsp_write(mapbitsp, size | (mapbits & PAGE_MASK));
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbits_large_set(arena_chunk_t *chunk, size_t pageind, size_t size,
|
|
size_t flags)
|
|
{
|
|
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
|
|
size_t mapbits = arena_mapbitsp_read(mapbitsp);
|
|
size_t unzeroed;
|
|
|
|
assert((size & PAGE_MASK) == 0);
|
|
assert((flags & CHUNK_MAP_DIRTY) == flags);
|
|
unzeroed = mapbits & CHUNK_MAP_UNZEROED; /* Preserve unzeroed. */
|
|
arena_mapbitsp_write(mapbitsp, size | CHUNK_MAP_BININD_INVALID | flags
|
|
| unzeroed | CHUNK_MAP_LARGE | CHUNK_MAP_ALLOCATED);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbits_large_binind_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t binind)
|
|
{
|
|
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
|
|
size_t mapbits = arena_mapbitsp_read(mapbitsp);
|
|
|
|
assert(binind <= BININD_INVALID);
|
|
assert(arena_mapbits_large_size_get(chunk, pageind) == PAGE);
|
|
arena_mapbitsp_write(mapbitsp, (mapbits & ~CHUNK_MAP_BININD_MASK) |
|
|
(binind << CHUNK_MAP_BININD_SHIFT));
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbits_small_set(arena_chunk_t *chunk, size_t pageind, size_t runind,
|
|
size_t binind, size_t flags)
|
|
{
|
|
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
|
|
size_t mapbits = arena_mapbitsp_read(mapbitsp);
|
|
size_t unzeroed;
|
|
|
|
assert(binind < BININD_INVALID);
|
|
assert(pageind - runind >= map_bias);
|
|
assert((flags & CHUNK_MAP_DIRTY) == flags);
|
|
unzeroed = mapbits & CHUNK_MAP_UNZEROED; /* Preserve unzeroed. */
|
|
arena_mapbitsp_write(mapbitsp, (runind << LG_PAGE) | (binind <<
|
|
CHUNK_MAP_BININD_SHIFT) | flags | unzeroed | CHUNK_MAP_ALLOCATED);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_mapbits_unzeroed_set(arena_chunk_t *chunk, size_t pageind,
|
|
size_t unzeroed)
|
|
{
|
|
size_t *mapbitsp = arena_mapbitsp_get(chunk, pageind);
|
|
size_t mapbits = arena_mapbitsp_read(mapbitsp);
|
|
|
|
arena_mapbitsp_write(mapbitsp, (mapbits & ~CHUNK_MAP_UNZEROED) |
|
|
unzeroed);
|
|
}
|
|
|
|
JEMALLOC_INLINE bool
|
|
arena_prof_accum_impl(arena_t *arena, uint64_t accumbytes)
|
|
{
|
|
|
|
cassert(config_prof);
|
|
assert(prof_interval != 0);
|
|
|
|
arena->prof_accumbytes += accumbytes;
|
|
if (arena->prof_accumbytes >= prof_interval) {
|
|
arena->prof_accumbytes -= prof_interval;
|
|
return (true);
|
|
}
|
|
return (false);
|
|
}
|
|
|
|
JEMALLOC_INLINE bool
|
|
arena_prof_accum_locked(arena_t *arena, uint64_t accumbytes)
|
|
{
|
|
|
|
cassert(config_prof);
|
|
|
|
if (prof_interval == 0)
|
|
return (false);
|
|
return (arena_prof_accum_impl(arena, accumbytes));
|
|
}
|
|
|
|
JEMALLOC_INLINE bool
|
|
arena_prof_accum(arena_t *arena, uint64_t accumbytes)
|
|
{
|
|
|
|
cassert(config_prof);
|
|
|
|
if (prof_interval == 0)
|
|
return (false);
|
|
|
|
{
|
|
bool ret;
|
|
|
|
malloc_mutex_lock(&arena->lock);
|
|
ret = arena_prof_accum_impl(arena, accumbytes);
|
|
malloc_mutex_unlock(&arena->lock);
|
|
return (ret);
|
|
}
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_ptr_small_binind_get(const void *ptr, size_t mapbits)
|
|
{
|
|
size_t binind;
|
|
|
|
binind = (mapbits & CHUNK_MAP_BININD_MASK) >> CHUNK_MAP_BININD_SHIFT;
|
|
|
|
if (config_debug) {
|
|
arena_chunk_t *chunk;
|
|
arena_t *arena;
|
|
size_t pageind;
|
|
size_t actual_mapbits;
|
|
arena_run_t *run;
|
|
arena_bin_t *bin;
|
|
size_t actual_binind;
|
|
arena_bin_info_t *bin_info;
|
|
|
|
assert(binind != BININD_INVALID);
|
|
assert(binind < NBINS);
|
|
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
|
|
arena = chunk->arena;
|
|
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
|
|
actual_mapbits = arena_mapbits_get(chunk, pageind);
|
|
assert(mapbits == actual_mapbits);
|
|
assert(arena_mapbits_large_get(chunk, pageind) == 0);
|
|
assert(arena_mapbits_allocated_get(chunk, pageind) != 0);
|
|
run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
|
|
(actual_mapbits >> LG_PAGE)) << LG_PAGE));
|
|
bin = run->bin;
|
|
actual_binind = bin - arena->bins;
|
|
assert(binind == actual_binind);
|
|
bin_info = &arena_bin_info[actual_binind];
|
|
assert(((uintptr_t)ptr - ((uintptr_t)run +
|
|
(uintptr_t)bin_info->reg0_offset)) % bin_info->reg_interval
|
|
== 0);
|
|
}
|
|
|
|
return (binind);
|
|
}
|
|
# endif /* JEMALLOC_ARENA_INLINE_A */
|
|
|
|
# ifdef JEMALLOC_ARENA_INLINE_B
|
|
JEMALLOC_INLINE size_t
|
|
arena_bin_index(arena_t *arena, arena_bin_t *bin)
|
|
{
|
|
size_t binind = bin - arena->bins;
|
|
assert(binind < NBINS);
|
|
return (binind);
|
|
}
|
|
|
|
JEMALLOC_INLINE unsigned
|
|
arena_run_regind(arena_run_t *run, arena_bin_info_t *bin_info, const void *ptr)
|
|
{
|
|
unsigned shift, diff, regind;
|
|
size_t interval;
|
|
|
|
/*
|
|
* Freeing a pointer lower than region zero can cause assertion
|
|
* failure.
|
|
*/
|
|
assert((uintptr_t)ptr >= (uintptr_t)run +
|
|
(uintptr_t)bin_info->reg0_offset);
|
|
|
|
/*
|
|
* Avoid doing division with a variable divisor if possible. Using
|
|
* actual division here can reduce allocator throughput by over 20%!
|
|
*/
|
|
diff = (unsigned)((uintptr_t)ptr - (uintptr_t)run -
|
|
bin_info->reg0_offset);
|
|
|
|
/* Rescale (factor powers of 2 out of the numerator and denominator). */
|
|
interval = bin_info->reg_interval;
|
|
shift = ffs(interval) - 1;
|
|
diff >>= shift;
|
|
interval >>= shift;
|
|
|
|
if (interval == 1) {
|
|
/* The divisor was a power of 2. */
|
|
regind = diff;
|
|
} else {
|
|
/*
|
|
* To divide by a number D that is not a power of two we
|
|
* multiply by (2^21 / D) and then right shift by 21 positions.
|
|
*
|
|
* X / D
|
|
*
|
|
* becomes
|
|
*
|
|
* (X * interval_invs[D - 3]) >> SIZE_INV_SHIFT
|
|
*
|
|
* We can omit the first three elements, because we never
|
|
* divide by 0, and 1 and 2 are both powers of two, which are
|
|
* handled above.
|
|
*/
|
|
#define SIZE_INV_SHIFT ((sizeof(unsigned) << 3) - LG_RUN_MAXREGS)
|
|
#define SIZE_INV(s) (((1U << SIZE_INV_SHIFT) / (s)) + 1)
|
|
static const unsigned interval_invs[] = {
|
|
SIZE_INV(3),
|
|
SIZE_INV(4), SIZE_INV(5), SIZE_INV(6), SIZE_INV(7),
|
|
SIZE_INV(8), SIZE_INV(9), SIZE_INV(10), SIZE_INV(11),
|
|
SIZE_INV(12), SIZE_INV(13), SIZE_INV(14), SIZE_INV(15),
|
|
SIZE_INV(16), SIZE_INV(17), SIZE_INV(18), SIZE_INV(19),
|
|
SIZE_INV(20), SIZE_INV(21), SIZE_INV(22), SIZE_INV(23),
|
|
SIZE_INV(24), SIZE_INV(25), SIZE_INV(26), SIZE_INV(27),
|
|
SIZE_INV(28), SIZE_INV(29), SIZE_INV(30), SIZE_INV(31)
|
|
};
|
|
|
|
if (interval <= ((sizeof(interval_invs) / sizeof(unsigned)) +
|
|
2)) {
|
|
regind = (diff * interval_invs[interval - 3]) >>
|
|
SIZE_INV_SHIFT;
|
|
} else
|
|
regind = diff / interval;
|
|
#undef SIZE_INV
|
|
#undef SIZE_INV_SHIFT
|
|
}
|
|
assert(diff == regind * interval);
|
|
assert(regind < bin_info->nregs);
|
|
|
|
return (regind);
|
|
}
|
|
|
|
JEMALLOC_INLINE prof_ctx_t *
|
|
arena_prof_ctx_get(const void *ptr)
|
|
{
|
|
prof_ctx_t *ret;
|
|
arena_chunk_t *chunk;
|
|
size_t pageind, mapbits;
|
|
|
|
cassert(config_prof);
|
|
assert(ptr != NULL);
|
|
assert(CHUNK_ADDR2BASE(ptr) != ptr);
|
|
|
|
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
|
|
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
assert((mapbits & CHUNK_MAP_ALLOCATED) != 0);
|
|
if ((mapbits & CHUNK_MAP_LARGE) == 0) {
|
|
if (prof_promote)
|
|
ret = (prof_ctx_t *)(uintptr_t)1U;
|
|
else {
|
|
arena_run_t *run = (arena_run_t *)((uintptr_t)chunk +
|
|
(uintptr_t)((pageind - (mapbits >> LG_PAGE)) <<
|
|
LG_PAGE));
|
|
size_t binind = arena_ptr_small_binind_get(ptr,
|
|
mapbits);
|
|
arena_bin_info_t *bin_info = &arena_bin_info[binind];
|
|
unsigned regind;
|
|
|
|
regind = arena_run_regind(run, bin_info, ptr);
|
|
ret = *(prof_ctx_t **)((uintptr_t)run +
|
|
bin_info->ctx0_offset + (regind *
|
|
sizeof(prof_ctx_t *)));
|
|
}
|
|
} else
|
|
ret = arena_mapp_get(chunk, pageind)->prof_ctx;
|
|
|
|
return (ret);
|
|
}
|
|
|
|
JEMALLOC_INLINE void
|
|
arena_prof_ctx_set(const void *ptr, size_t usize, prof_ctx_t *ctx)
|
|
{
|
|
arena_chunk_t *chunk;
|
|
size_t pageind;
|
|
|
|
cassert(config_prof);
|
|
assert(ptr != NULL);
|
|
assert(CHUNK_ADDR2BASE(ptr) != ptr);
|
|
|
|
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
|
|
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
|
|
assert(arena_mapbits_allocated_get(chunk, pageind) != 0);
|
|
|
|
if (usize > SMALL_MAXCLASS || (prof_promote &&
|
|
((uintptr_t)ctx != (uintptr_t)1U || arena_mapbits_large_get(chunk,
|
|
pageind) != 0))) {
|
|
assert(arena_mapbits_large_get(chunk, pageind) != 0);
|
|
arena_mapp_get(chunk, pageind)->prof_ctx = ctx;
|
|
} else {
|
|
assert(arena_mapbits_large_get(chunk, pageind) == 0);
|
|
if (prof_promote == false) {
|
|
size_t mapbits = arena_mapbits_get(chunk, pageind);
|
|
arena_run_t *run = (arena_run_t *)((uintptr_t)chunk +
|
|
(uintptr_t)((pageind - (mapbits >> LG_PAGE)) <<
|
|
LG_PAGE));
|
|
size_t binind;
|
|
arena_bin_info_t *bin_info;
|
|
unsigned regind;
|
|
|
|
binind = arena_ptr_small_binind_get(ptr, mapbits);
|
|
bin_info = &arena_bin_info[binind];
|
|
regind = arena_run_regind(run, bin_info, ptr);
|
|
|
|
*((prof_ctx_t **)((uintptr_t)run +
|
|
bin_info->ctx0_offset + (regind * sizeof(prof_ctx_t
|
|
*)))) = ctx;
|
|
}
|
|
}
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void *
|
|
arena_malloc(arena_t *arena, size_t size, bool zero, bool try_tcache)
|
|
{
|
|
tcache_t *tcache;
|
|
|
|
assert(size != 0);
|
|
assert(size <= arena_maxclass);
|
|
|
|
if (size <= SMALL_MAXCLASS) {
|
|
if (try_tcache && (tcache = tcache_get(true)) != NULL)
|
|
return (tcache_alloc_small(tcache, size, zero));
|
|
else {
|
|
return (arena_malloc_small(choose_arena(arena), size,
|
|
zero));
|
|
}
|
|
} else {
|
|
/*
|
|
* Initialize tcache after checking size in order to avoid
|
|
* infinite recursion during tcache initialization.
|
|
*/
|
|
if (try_tcache && size <= tcache_maxclass && (tcache =
|
|
tcache_get(true)) != NULL)
|
|
return (tcache_alloc_large(tcache, size, zero));
|
|
else {
|
|
return (arena_malloc_large(choose_arena(arena), size,
|
|
zero));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return the size of the allocation pointed to by ptr. */
|
|
JEMALLOC_ALWAYS_INLINE size_t
|
|
arena_salloc(const void *ptr, bool demote)
|
|
{
|
|
size_t ret;
|
|
arena_chunk_t *chunk;
|
|
size_t pageind, binind;
|
|
|
|
assert(ptr != NULL);
|
|
assert(CHUNK_ADDR2BASE(ptr) != ptr);
|
|
|
|
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
|
|
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
|
|
assert(arena_mapbits_allocated_get(chunk, pageind) != 0);
|
|
binind = arena_mapbits_binind_get(chunk, pageind);
|
|
if (binind == BININD_INVALID || (config_prof && demote == false &&
|
|
prof_promote && arena_mapbits_large_get(chunk, pageind) != 0)) {
|
|
/*
|
|
* Large allocation. In the common case (demote == true), and
|
|
* as this is an inline function, most callers will only end up
|
|
* looking at binind to determine that ptr is a small
|
|
* allocation.
|
|
*/
|
|
assert(((uintptr_t)ptr & PAGE_MASK) == 0);
|
|
ret = arena_mapbits_large_size_get(chunk, pageind);
|
|
assert(ret != 0);
|
|
assert(pageind + (ret>>LG_PAGE) <= chunk_npages);
|
|
assert(ret == PAGE || arena_mapbits_large_size_get(chunk,
|
|
pageind+(ret>>LG_PAGE)-1) == 0);
|
|
assert(binind == arena_mapbits_binind_get(chunk,
|
|
pageind+(ret>>LG_PAGE)-1));
|
|
assert(arena_mapbits_dirty_get(chunk, pageind) ==
|
|
arena_mapbits_dirty_get(chunk, pageind+(ret>>LG_PAGE)-1));
|
|
} else {
|
|
/*
|
|
* Small allocation (possibly promoted to a large object due to
|
|
* prof_promote).
|
|
*/
|
|
assert(arena_mapbits_large_get(chunk, pageind) != 0 ||
|
|
arena_ptr_small_binind_get(ptr, arena_mapbits_get(chunk,
|
|
pageind)) == binind);
|
|
ret = arena_bin_info[binind].reg_size;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
JEMALLOC_ALWAYS_INLINE void
|
|
arena_dalloc(arena_chunk_t *chunk, void *ptr, bool try_tcache)
|
|
{
|
|
size_t pageind, mapbits;
|
|
tcache_t *tcache;
|
|
|
|
assert(ptr != NULL);
|
|
assert(CHUNK_ADDR2BASE(ptr) != ptr);
|
|
|
|
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE;
|
|
mapbits = arena_mapbits_get(chunk, pageind);
|
|
assert(arena_mapbits_allocated_get(chunk, pageind) != 0);
|
|
if ((mapbits & CHUNK_MAP_LARGE) == 0) {
|
|
/* Small allocation. */
|
|
if (try_tcache && (tcache = tcache_get(false)) != NULL) {
|
|
size_t binind;
|
|
|
|
binind = arena_ptr_small_binind_get(ptr, mapbits);
|
|
tcache_dalloc_small(tcache, ptr, binind);
|
|
} else
|
|
arena_dalloc_small(chunk->arena, chunk, ptr, pageind);
|
|
} else {
|
|
size_t size = arena_mapbits_large_size_get(chunk, pageind);
|
|
|
|
assert(((uintptr_t)ptr & PAGE_MASK) == 0);
|
|
|
|
if (try_tcache && size <= tcache_maxclass && (tcache =
|
|
tcache_get(false)) != NULL) {
|
|
tcache_dalloc_large(tcache, ptr, size);
|
|
} else
|
|
arena_dalloc_large(chunk->arena, chunk, ptr);
|
|
}
|
|
}
|
|
# endif /* JEMALLOC_ARENA_INLINE_B */
|
|
#endif
|
|
|
|
#endif /* JEMALLOC_H_INLINES */
|
|
/******************************************************************************/
|