84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
#ifndef JEMALLOC_INTERNAL_ESET_H
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#define JEMALLOC_INTERNAL_ESET_H
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#include "jemalloc/internal/atomic.h"
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#include "jemalloc/internal/bitmap.h"
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#include "jemalloc/internal/edata.h"
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#include "jemalloc/internal/mutex.h"
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/*
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* An eset ("extent set") is a quantized collection of extents, with built-in
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* LRU queue.
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*/
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typedef struct eset_s eset_t;
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struct eset_s {
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malloc_mutex_t mtx;
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/*
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* Quantized per size class heaps of extents.
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*
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* Synchronization: mtx.
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*/
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edata_heap_t heaps[SC_NPSIZES + 1];
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atomic_zu_t nextents[SC_NPSIZES + 1];
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atomic_zu_t nbytes[SC_NPSIZES + 1];
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/*
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* Bitmap for which set bits correspond to non-empty heaps.
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*
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* Synchronization: mtx.
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*/
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bitmap_t bitmap[BITMAP_GROUPS(SC_NPSIZES + 1)];
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/*
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* LRU of all extents in heaps.
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*
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* Synchronization: mtx.
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*/
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edata_list_t lru;
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/*
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* Page sum for all extents in heaps.
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*
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* The synchronization here is a little tricky. Modifications to npages
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* must hold mtx, but reads need not (though, a reader who sees npages
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* without holding the mutex can't assume anything about the rest of the
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* state of the eset_t).
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*/
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atomic_zu_t npages;
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/* All stored extents must be in the same state. */
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extent_state_t state;
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/*
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* If true, delay coalescing until eviction; otherwise coalesce during
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* deallocation.
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*/
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bool delay_coalesce;
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};
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bool eset_init(tsdn_t *tsdn, eset_t *eset, extent_state_t state,
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bool delay_coalesce);
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extent_state_t eset_state_get(const eset_t *eset);
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size_t eset_npages_get(eset_t *eset);
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/* Get the number of extents in the given page size index. */
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size_t eset_nextents_get(eset_t *eset, pszind_t ind);
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/* Get the sum total bytes of the extents in the given page size index. */
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size_t eset_nbytes_get(eset_t *eset, pszind_t ind);
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void eset_insert_locked(tsdn_t *tsdn, eset_t *eset, edata_t *edata);
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void eset_remove_locked(tsdn_t *tsdn, eset_t *eset, edata_t *edata);
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/*
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* Select an extent from this eset of the given size and alignment. Returns
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* null if no such item could be found.
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*/
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edata_t *eset_fit_locked(tsdn_t *tsdn, eset_t *eset, size_t esize,
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size_t alignment);
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void eset_prefork(tsdn_t *tsdn, eset_t *eset);
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void eset_postfork_parent(tsdn_t *tsdn, eset_t *eset);
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void eset_postfork_child(tsdn_t *tsdn, eset_t *eset);
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#endif /* JEMALLOC_INTERNAL_ESET_H */
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