#ifndef JEMALLOC_INTERNAL_BIN_H
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#define JEMALLOC_INTERNAL_BIN_H
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#include "jemalloc/internal/bin_stats.h"
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#include "jemalloc/internal/bin_types.h"
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#include "jemalloc/internal/extent_types.h"
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#include "jemalloc/internal/extent_structs.h"
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#include "jemalloc/internal/mutex.h"
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#include "jemalloc/internal/sc.h"
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/*
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* A bin contains a set of extents that are currently being used for slab
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* allocations.
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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 slab has the following layout:
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*
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* /--------------------\
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* | region 0 |
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* |--------------------|
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* | region 1 |
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* |--------------------|
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* | ... |
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* | ... |
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* | ... |
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* |--------------------|
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* | region nregs-1 |
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* \--------------------/
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*/
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typedef struct bin_info_s bin_info_t;
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struct bin_info_s {
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/* Size of regions in a slab for this bin's size class. */
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size_t reg_size;
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/* Total size of a slab for this bin's size class. */
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size_t slab_size;
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/* Total number of regions in a slab for this bin's size class. */
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uint32_t nregs;
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/* Number of sharded bins in each arena for this size class. */
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uint32_t n_shards;
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/*
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* Metadata used to manipulate bitmaps for slabs 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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extern bin_info_t bin_infos[SC_NBINS];
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typedef struct bin_s bin_t;
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struct bin_s {
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/* All operations on bin_t fields require lock ownership. */
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malloc_mutex_t lock;
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/*
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* Current slab being used to service allocations of this bin's size
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* class. slabcur is independent of slabs_{nonfull,full}; whenever
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* slabcur is reassigned, the previous slab must be deallocated or
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* inserted into slabs_{nonfull,full}.
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*/
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extent_t *slabcur;
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/*
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* Heap of non-full slabs. This heap is used to assure that new
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* allocations come from the non-full slab that is oldest/lowest in
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* memory.
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*/
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extent_heap_t slabs_nonfull;
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/* List used to track full slabs. */
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extent_list_t slabs_full;
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/* Bin statistics. */
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bin_stats_t stats;
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};
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/* A set of sharded bins of the same size class. */
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typedef struct bins_s bins_t;
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struct bins_s {
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/* Sharded bins. Dynamically sized. */
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bin_t *bin_shards;
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};
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void bin_shard_sizes_boot(unsigned bin_shards[SC_NBINS]);
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bool bin_update_shard_size(unsigned bin_shards[SC_NBINS], size_t start_size,
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size_t end_size, size_t nshards);
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void bin_boot(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS]);
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/* Initializes a bin to empty. Returns true on error. */
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bool bin_init(bin_t *bin);
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/* Forking. */
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void bin_prefork(tsdn_t *tsdn, bin_t *bin);
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void bin_postfork_parent(tsdn_t *tsdn, bin_t *bin);
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void bin_postfork_child(tsdn_t *tsdn, bin_t *bin);
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/* Stats. */
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static inline void
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bin_stats_merge(tsdn_t *tsdn, bin_stats_t *dst_bin_stats, bin_t *bin) {
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malloc_mutex_lock(tsdn, &bin->lock);
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malloc_mutex_prof_accum(tsdn, &dst_bin_stats->mutex_data, &bin->lock);
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dst_bin_stats->nmalloc += bin->stats.nmalloc;
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dst_bin_stats->ndalloc += bin->stats.ndalloc;
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dst_bin_stats->nrequests += bin->stats.nrequests;
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dst_bin_stats->curregs += bin->stats.curregs;
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dst_bin_stats->nfills += bin->stats.nfills;
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dst_bin_stats->nflushes += bin->stats.nflushes;
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dst_bin_stats->nslabs += bin->stats.nslabs;
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dst_bin_stats->reslabs += bin->stats.reslabs;
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dst_bin_stats->curslabs += bin->stats.curslabs;
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dst_bin_stats->nonfull_slabs += bin->stats.nonfull_slabs;
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malloc_mutex_unlock(tsdn, &bin->lock);
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}
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#endif /* JEMALLOC_INTERNAL_BIN_H */
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