21b70cb540
This will be the centralized component of the coming hugepage allocator; the source of larger chunks of memory from which smaller ones can be obtained.
48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
#ifndef JEMALLOC_INTERNAL_HPA_CENTRAL_H
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#define JEMALLOC_INTERNAL_HPA_CENTRAL_H
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#include "jemalloc/internal/base.h"
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#include "jemalloc/internal/emap.h"
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typedef struct hpa_central_s hpa_central_t;
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struct hpa_central_s {
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/* The emap we use for metadata operations. */
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emap_t *emap;
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edata_cache_t *edata_cache;
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eset_t eset;
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size_t sn_next;
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};
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void hpa_central_init(hpa_central_t *central, edata_cache_t *edata_cache,
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emap_t *emap);
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/*
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* Tries to satisfy the given allocation request with an extent already given to
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* central.
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*/
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edata_t *hpa_central_alloc_reuse(tsdn_t *tsdn, hpa_central_t *central,
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size_t size_min, size_t size_goal);
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/*
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* Adds the given edata to the central allocator as a new allocation. The
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* intent is that after a reuse attempt fails, the caller can allocate a new
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* extent using whatever growth policy it prefers and allocate from that, giving
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* the excess to the hpa_central_t (this is analogous to the
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* extent_grow_retained functionality; we can allocate address space in
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* exponentially growing chunks).
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*
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* The edata_t should come from the same base that this hpa was initialized
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* with. Only complete extents should be added (i.e. those for which the head
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* bit is true, and for which their successor is either not owned by jemalloc
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* or also has a head bit of true). It should be active, large enough to
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* satisfy the requested allocation, and not already in the emap.
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*
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* If this returns true, then we did not accept the extent, and took no action.
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* Otherwise, modifies *edata to satisfy the allocation.
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*/
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bool hpa_central_alloc_grow(tsdn_t *tsdn, hpa_central_t *central,
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size_t size, edata_t *to_add);
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void hpa_central_dalloc(tsdn_t *tsdn, hpa_central_t *central, edata_t *edata);
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#endif /* JEMALLOC_INTERNAL_HPA_CENTRAL_H */
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