7bb05e04be
This mallctl accepts an arena_config_t structure which can be used to customize the behavior of the arena. Right now it contains extent_hooks and a new option, metadata_use_hooks, which controls whether the extent hooks are also used for metadata allocation. The medata_use_hooks option has two main use cases: 1. In heterogeneous memory systems, to avoid metadata being placed on potentially slower memory. 2. Avoiding virtual memory from being leaked as a result of metadata allocation failure originating in an extent hook.
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
#ifndef JEMALLOC_INTERNAL_BASE_STRUCTS_H
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#define JEMALLOC_INTERNAL_BASE_STRUCTS_H
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#include "jemalloc/internal/ehooks.h"
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#include "jemalloc/internal/edata.h"
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#include "jemalloc/internal/jemalloc_internal_types.h"
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#include "jemalloc/internal/mutex.h"
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#include "jemalloc/internal/sc.h"
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/* Embedded at the beginning of every block of base-managed virtual memory. */
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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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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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* Use user hooks for metadata when true.
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*/
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bool metadata_use_hooks;
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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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#endif /* JEMALLOC_INTERNAL_BASE_STRUCTS_H */
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