111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
#ifndef JEMALLOC_INTERNAL_BASE_H
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#define JEMALLOC_INTERNAL_BASE_H
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#include "jemalloc/internal/edata.h"
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#include "jemalloc/internal/ehooks.h"
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#include "jemalloc/internal/mutex.h"
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enum metadata_thp_mode_e {
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metadata_thp_disabled = 0,
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/*
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* Lazily enable hugepage for metadata. To avoid high RSS caused by THP
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* + low usage arena (i.e. THP becomes a significant percentage), the
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* "auto" option only starts using THP after a base allocator used up
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* the first THP region. Starting from the second hugepage (in a single
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* arena), "auto" behaves the same as "always", i.e. madvise hugepage
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* right away.
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*/
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metadata_thp_auto = 1,
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metadata_thp_always = 2,
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metadata_thp_mode_limit = 3
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};
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typedef enum metadata_thp_mode_e metadata_thp_mode_t;
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#define METADATA_THP_DEFAULT metadata_thp_disabled
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extern metadata_thp_mode_t opt_metadata_thp;
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extern const char *metadata_thp_mode_names[];
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/* Embedded at the beginning of every block of base-managed virtual memory. */
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typedef struct base_block_s base_block_t;
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struct base_block_s {
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/* Total size of block's virtual memory mapping. */
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size_t size;
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/* Next block in list of base's blocks. */
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base_block_t *next;
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/* Tracks unused trailing space. */
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edata_t edata;
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};
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typedef struct base_s base_t;
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struct base_s {
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/*
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* User-configurable extent hook functions.
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*/
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ehooks_t ehooks;
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/*
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* User-configurable extent hook functions for metadata allocations.
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*/
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ehooks_t ehooks_base;
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/* Protects base_alloc() and base_stats_get() operations. */
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malloc_mutex_t mtx;
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/* Using THP when true (metadata_thp auto mode). */
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bool auto_thp_switched;
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/*
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* Most recent size class in the series of increasingly large base
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* extents. Logarithmic spacing between subsequent allocations ensures
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* that the total number of distinct mappings remains small.
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*/
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pszind_t pind_last;
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/* Serial number generation state. */
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size_t extent_sn_next;
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/* Chain of all blocks associated with base. */
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base_block_t *blocks;
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/* Heap of extents that track unused trailing space within blocks. */
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edata_heap_t avail[SC_NSIZES];
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/* Stats, only maintained if config_stats. */
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size_t allocated;
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size_t resident;
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size_t mapped;
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/* Number of THP regions touched. */
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size_t n_thp;
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};
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static inline unsigned
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base_ind_get(const base_t *base) {
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return ehooks_ind_get(&base->ehooks);
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}
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static inline bool
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metadata_thp_enabled(void) {
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return (opt_metadata_thp != metadata_thp_disabled);
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}
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base_t *b0get(void);
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base_t *base_new(tsdn_t *tsdn, unsigned ind,
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const extent_hooks_t *extent_hooks, bool metadata_use_hooks);
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void base_delete(tsdn_t *tsdn, base_t *base);
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ehooks_t *base_ehooks_get(base_t *base);
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ehooks_t *base_ehooks_get_for_metadata(base_t *base);
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extent_hooks_t *base_extent_hooks_set(base_t *base,
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extent_hooks_t *extent_hooks);
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void *base_alloc(tsdn_t *tsdn, base_t *base, size_t size, size_t alignment);
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edata_t *base_alloc_edata(tsdn_t *tsdn, base_t *base);
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void base_stats_get(tsdn_t *tsdn, base_t *base, size_t *allocated,
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size_t *resident, size_t *mapped, size_t *n_thp);
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void base_prefork(tsdn_t *tsdn, base_t *base);
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void base_postfork_parent(tsdn_t *tsdn, base_t *base);
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void base_postfork_child(tsdn_t *tsdn, base_t *base);
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bool base_boot(tsdn_t *tsdn);
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#endif /* JEMALLOC_INTERNAL_BASE_H */
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