server-skynet-source-3rd-je.../include/jemalloc/internal/hpa_central.h
David Goldblatt 21b70cb540 Add hpa_central module
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.
2020-10-05 19:55:57 -07:00

48 lines
1.8 KiB
C

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