a8f8d7540d
Remove mmap_unaligned, which was used to heuristically decide whether to optimistically call mmap() in such a way that could reduce the total number of system calls. If I remember correctly, the intention of mmap_unaligned was to avoid always executing the slow path in the presence of ASLR. However, that reasoning seems to have been based on a flawed understanding of how ASLR actually works. Although ASLR apparently causes mmap() to ignore address requests, it does not cause total placement randomness, so there is a reasonable expectation that iterative mmap() calls will start returning chunk-aligned mappings once the first chunk has been properly aligned.
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/******************************************************************************/
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#ifdef JEMALLOC_H_TYPES
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/*
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* Size and alignment of memory chunks that are allocated by the OS's virtual
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* memory system.
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*/
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#define LG_CHUNK_DEFAULT 22
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/* Return the chunk address for allocation address a. */
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#define CHUNK_ADDR2BASE(a) \
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((void *)((uintptr_t)(a) & ~chunksize_mask))
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/* Return the chunk offset of address a. */
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#define CHUNK_ADDR2OFFSET(a) \
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((size_t)((uintptr_t)(a) & chunksize_mask))
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/* Return the smallest chunk multiple that is >= s. */
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#define CHUNK_CEILING(s) \
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(((s) + chunksize_mask) & ~chunksize_mask)
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#endif /* JEMALLOC_H_TYPES */
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/******************************************************************************/
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#ifdef JEMALLOC_H_STRUCTS
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#endif /* JEMALLOC_H_STRUCTS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_EXTERNS
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extern size_t opt_lg_chunk;
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/* Protects stats_chunks; currently not used for any other purpose. */
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extern malloc_mutex_t chunks_mtx;
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/* Chunk statistics. */
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extern chunk_stats_t stats_chunks;
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extern rtree_t *chunks_rtree;
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extern size_t chunksize;
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extern size_t chunksize_mask; /* (chunksize - 1). */
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extern size_t chunk_npages;
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extern size_t map_bias; /* Number of arena chunk header pages. */
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extern size_t arena_maxclass; /* Max size class for arenas. */
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void *chunk_alloc(size_t size, size_t alignment, bool base, bool *zero);
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void chunk_dealloc(void *chunk, size_t size, bool unmap);
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bool chunk_boot(void);
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#endif /* JEMALLOC_H_EXTERNS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_INLINES
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#endif /* JEMALLOC_H_INLINES */
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/******************************************************************************/
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#include "jemalloc/internal/chunk_dss.h"
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#include "jemalloc/internal/chunk_mmap.h"
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