#define JEMALLOC_ARENA_C_ #include "jemalloc/internal/jemalloc_internal.h" /******************************************************************************/ /* Data. */ ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT; static ssize_t lg_dirty_mult_default; arena_bin_info_t arena_bin_info[NBINS]; size_t map_bias; size_t map_misc_offset; size_t arena_maxrun; /* Max run size for arenas. */ size_t large_maxclass; /* Max large size class. */ static size_t small_maxrun; /* Max run size used for small size classes. */ static bool *small_run_tab; /* Valid small run page multiples. */ unsigned nlclasses; /* Number of large size classes. */ unsigned nhclasses; /* Number of huge size classes. */ /******************************************************************************/ /* * Function prototypes for static functions that are referenced prior to * definition. */ static void arena_purge(arena_t *arena, bool all); static void arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty, bool cleaned, bool decommitted); static void arena_dalloc_bin_run(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, arena_bin_t *bin); static void arena_bin_lower_run(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, arena_bin_t *bin); /******************************************************************************/ #define CHUNK_MAP_KEY ((uintptr_t)0x1U) JEMALLOC_INLINE_C arena_chunk_map_misc_t * arena_miscelm_key_create(size_t size) { return ((arena_chunk_map_misc_t *)(arena_mapbits_size_encode(size) | CHUNK_MAP_KEY)); } JEMALLOC_INLINE_C bool arena_miscelm_is_key(const arena_chunk_map_misc_t *miscelm) { return (((uintptr_t)miscelm & CHUNK_MAP_KEY) != 0); } #undef CHUNK_MAP_KEY JEMALLOC_INLINE_C size_t arena_miscelm_key_size_get(const arena_chunk_map_misc_t *miscelm) { assert(arena_miscelm_is_key(miscelm)); return (arena_mapbits_size_decode((uintptr_t)miscelm)); } JEMALLOC_INLINE_C size_t arena_miscelm_size_get(arena_chunk_map_misc_t *miscelm) { arena_chunk_t *chunk; size_t pageind, mapbits; assert(!arena_miscelm_is_key(miscelm)); chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(miscelm); pageind = arena_miscelm_to_pageind(miscelm); mapbits = arena_mapbits_get(chunk, pageind); return (arena_mapbits_size_decode(mapbits)); } JEMALLOC_INLINE_C int arena_run_comp(arena_chunk_map_misc_t *a, arena_chunk_map_misc_t *b) { uintptr_t a_miscelm = (uintptr_t)a; uintptr_t b_miscelm = (uintptr_t)b; assert(a != NULL); assert(b != NULL); return ((a_miscelm > b_miscelm) - (a_miscelm < b_miscelm)); } /* Generate red-black tree functions. */ rb_gen(static UNUSED, arena_run_tree_, arena_run_tree_t, arena_chunk_map_misc_t, rb_link, arena_run_comp) static size_t run_quantize(size_t size) { size_t qsize; assert(size != 0); assert(size == PAGE_CEILING(size)); /* Don't change sizes that are valid small run sizes. */ if (size <= small_maxrun && small_run_tab[size >> LG_PAGE]) return (size); /* * Round down to the nearest run size that can actually be requested * during normal large allocation. Add large_pad so that cache index * randomization can offset the allocation from the page boundary. */ qsize = index2size(size2index(size - large_pad + 1) - 1) + large_pad; if (qsize <= SMALL_MAXCLASS + large_pad) return (run_quantize(size - large_pad)); assert(qsize <= size); return (qsize); } static size_t run_quantize_next(size_t size) { size_t large_run_size_next; assert(size != 0); assert(size == PAGE_CEILING(size)); /* * Return the next quantized size greater than the input size. * Quantized sizes comprise the union of run sizes that back small * region runs, and run sizes that back large regions with no explicit * alignment constraints. */ if (size > SMALL_MAXCLASS) { large_run_size_next = PAGE_CEILING(index2size(size2index(size - large_pad) + 1) + large_pad); } else large_run_size_next = SIZE_T_MAX; if (size >= small_maxrun) return (large_run_size_next); while (true) { size += PAGE; assert(size <= small_maxrun); if (small_run_tab[size >> LG_PAGE]) { if (large_run_size_next < size) return (large_run_size_next); return (size); } } } static size_t run_quantize_first(size_t size) { size_t qsize = run_quantize(size); if (qsize < size) { /* * Skip a quantization that may have an adequately large run, * because under-sized runs may be mixed in. This only happens * when an unusual size is requested, i.e. for aligned * allocation, and is just one of several places where linear * search would potentially find sufficiently aligned available * memory somewhere lower. */ qsize = run_quantize_next(size); } return (qsize); } JEMALLOC_INLINE_C int arena_avail_comp(arena_chunk_map_misc_t *a, arena_chunk_map_misc_t *b) { int ret; uintptr_t a_miscelm = (uintptr_t)a; size_t a_qsize = run_quantize(arena_miscelm_is_key(a) ? arena_miscelm_key_size_get(a) : arena_miscelm_size_get(a)); size_t b_qsize = run_quantize(arena_miscelm_size_get(b)); /* * Compare based on quantized size rather than size, in order to sort * equally useful runs only by address. */ ret = (a_qsize > b_qsize) - (a_qsize < b_qsize); if (ret == 0) { if (!arena_miscelm_is_key(a)) { uintptr_t b_miscelm = (uintptr_t)b; ret = (a_miscelm > b_miscelm) - (a_miscelm < b_miscelm); } else { /* * Treat keys as if they are lower than anything else. */ ret = -1; } } return (ret); } /* Generate red-black tree functions. */ rb_gen(static UNUSED, arena_avail_tree_, arena_avail_tree_t, arena_chunk_map_misc_t, rb_link, arena_avail_comp) static void arena_avail_insert(arena_t *arena, arena_chunk_t *chunk, size_t pageind, size_t npages) { assert(npages == (arena_mapbits_unallocated_size_get(chunk, pageind) >> LG_PAGE)); arena_avail_tree_insert(&arena->runs_avail, arena_miscelm_get(chunk, pageind)); } static void arena_avail_remove(arena_t *arena, arena_chunk_t *chunk, size_t pageind, size_t npages) { assert(npages == (arena_mapbits_unallocated_size_get(chunk, pageind) >> LG_PAGE)); arena_avail_tree_remove(&arena->runs_avail, arena_miscelm_get(chunk, pageind)); } static void arena_run_dirty_insert(arena_t *arena, arena_chunk_t *chunk, size_t pageind, size_t npages) { arena_chunk_map_misc_t *miscelm = arena_miscelm_get(chunk, pageind); assert(npages == (arena_mapbits_unallocated_size_get(chunk, pageind) >> LG_PAGE)); assert(arena_mapbits_dirty_get(chunk, pageind) == CHUNK_MAP_DIRTY); assert(arena_mapbits_dirty_get(chunk, pageind+npages-1) == CHUNK_MAP_DIRTY); qr_new(&miscelm->rd, rd_link); qr_meld(&arena->runs_dirty, &miscelm->rd, rd_link); arena->ndirty += npages; } static void arena_run_dirty_remove(arena_t *arena, arena_chunk_t *chunk, size_t pageind, size_t npages) { arena_chunk_map_misc_t *miscelm = arena_miscelm_get(chunk, pageind); assert(npages == (arena_mapbits_unallocated_size_get(chunk, pageind) >> LG_PAGE)); assert(arena_mapbits_dirty_get(chunk, pageind) == CHUNK_MAP_DIRTY); assert(arena_mapbits_dirty_get(chunk, pageind+npages-1) == CHUNK_MAP_DIRTY); qr_remove(&miscelm->rd, rd_link); assert(arena->ndirty >= npages); arena->ndirty -= npages; } static size_t arena_chunk_dirty_npages(const extent_node_t *node) { return (extent_node_size_get(node) >> LG_PAGE); } void arena_chunk_cache_maybe_insert(arena_t *arena, extent_node_t *node, bool cache) { if (cache) { extent_node_dirty_linkage_init(node); extent_node_dirty_insert(node, &arena->runs_dirty, &arena->chunks_cache); arena->ndirty += arena_chunk_dirty_npages(node); } } void arena_chunk_cache_maybe_remove(arena_t *arena, extent_node_t *node, bool dirty) { if (dirty) { extent_node_dirty_remove(node); assert(arena->ndirty >= arena_chunk_dirty_npages(node)); arena->ndirty -= arena_chunk_dirty_npages(node); } } JEMALLOC_INLINE_C void * arena_run_reg_alloc(arena_run_t *run, arena_bin_info_t *bin_info) { void *ret; unsigned regind; arena_chunk_map_misc_t *miscelm; void *rpages; assert(run->nfree > 0); assert(!bitmap_full(run->bitmap, &bin_info->bitmap_info)); regind = bitmap_sfu(run->bitmap, &bin_info->bitmap_info); miscelm = arena_run_to_miscelm(run); rpages = arena_miscelm_to_rpages(miscelm); ret = (void *)((uintptr_t)rpages + (uintptr_t)bin_info->reg0_offset + (uintptr_t)(bin_info->reg_interval * regind)); run->nfree--; return (ret); } JEMALLOC_INLINE_C void arena_run_reg_dalloc(arena_run_t *run, void *ptr) { arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; size_t mapbits = arena_mapbits_get(chunk, pageind); szind_t binind = arena_ptr_small_binind_get(ptr, mapbits); arena_bin_info_t *bin_info = &arena_bin_info[binind]; unsigned regind = arena_run_regind(run, bin_info, ptr); assert(run->nfree < bin_info->nregs); /* Freeing an interior pointer can cause assertion failure. */ assert(((uintptr_t)ptr - ((uintptr_t)arena_miscelm_to_rpages(arena_run_to_miscelm(run)) + (uintptr_t)bin_info->reg0_offset)) % (uintptr_t)bin_info->reg_interval == 0); assert((uintptr_t)ptr >= (uintptr_t)arena_miscelm_to_rpages(arena_run_to_miscelm(run)) + (uintptr_t)bin_info->reg0_offset); /* Freeing an unallocated pointer can cause assertion failure. */ assert(bitmap_get(run->bitmap, &bin_info->bitmap_info, regind)); bitmap_unset(run->bitmap, &bin_info->bitmap_info, regind); run->nfree++; } JEMALLOC_INLINE_C void arena_run_zero(arena_chunk_t *chunk, size_t run_ind, size_t npages) { JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED((void *)((uintptr_t)chunk + (run_ind << LG_PAGE)), (npages << LG_PAGE)); memset((void *)((uintptr_t)chunk + (run_ind << LG_PAGE)), 0, (npages << LG_PAGE)); } JEMALLOC_INLINE_C void arena_run_page_mark_zeroed(arena_chunk_t *chunk, size_t run_ind) { JEMALLOC_VALGRIND_MAKE_MEM_DEFINED((void *)((uintptr_t)chunk + (run_ind << LG_PAGE)), PAGE); } JEMALLOC_INLINE_C void arena_run_page_validate_zeroed(arena_chunk_t *chunk, size_t run_ind) { size_t i; UNUSED size_t *p = (size_t *)((uintptr_t)chunk + (run_ind << LG_PAGE)); arena_run_page_mark_zeroed(chunk, run_ind); for (i = 0; i < PAGE / sizeof(size_t); i++) assert(p[i] == 0); } static void arena_cactive_update(arena_t *arena, size_t add_pages, size_t sub_pages) { if (config_stats) { ssize_t cactive_diff = CHUNK_CEILING((arena->nactive + add_pages - sub_pages) << LG_PAGE) - CHUNK_CEILING(arena->nactive << LG_PAGE); if (cactive_diff != 0) stats_cactive_add(cactive_diff); } } static void arena_run_split_remove(arena_t *arena, arena_chunk_t *chunk, size_t run_ind, size_t flag_dirty, size_t flag_decommitted, size_t need_pages) { size_t total_pages, rem_pages; assert(flag_dirty == 0 || flag_decommitted == 0); total_pages = arena_mapbits_unallocated_size_get(chunk, run_ind) >> LG_PAGE; assert(arena_mapbits_dirty_get(chunk, run_ind+total_pages-1) == flag_dirty); assert(need_pages <= total_pages); rem_pages = total_pages - need_pages; arena_avail_remove(arena, chunk, run_ind, total_pages); if (flag_dirty != 0) arena_run_dirty_remove(arena, chunk, run_ind, total_pages); arena_cactive_update(arena, need_pages, 0); arena->nactive += need_pages; /* Keep track of trailing unused pages for later use. */ if (rem_pages > 0) { size_t flags = flag_dirty | flag_decommitted; size_t flag_unzeroed_mask = (flags == 0) ? CHUNK_MAP_UNZEROED : 0; arena_mapbits_unallocated_set(chunk, run_ind+need_pages, (rem_pages << LG_PAGE), flags | (arena_mapbits_unzeroed_get(chunk, run_ind+need_pages) & flag_unzeroed_mask)); arena_mapbits_unallocated_set(chunk, run_ind+total_pages-1, (rem_pages << LG_PAGE), flags | (arena_mapbits_unzeroed_get(chunk, run_ind+total_pages-1) & flag_unzeroed_mask)); if (flag_dirty != 0) { arena_run_dirty_insert(arena, chunk, run_ind+need_pages, rem_pages); } arena_avail_insert(arena, chunk, run_ind+need_pages, rem_pages); } } static bool arena_run_split_large_helper(arena_t *arena, arena_run_t *run, size_t size, bool remove, bool zero) { arena_chunk_t *chunk; arena_chunk_map_misc_t *miscelm; size_t flag_dirty, flag_decommitted, run_ind, need_pages; size_t flag_unzeroed_mask; chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); miscelm = arena_run_to_miscelm(run); run_ind = arena_miscelm_to_pageind(miscelm); flag_dirty = arena_mapbits_dirty_get(chunk, run_ind); flag_decommitted = arena_mapbits_decommitted_get(chunk, run_ind); need_pages = (size >> LG_PAGE); assert(need_pages > 0); if (flag_decommitted != 0 && arena->chunk_hooks.commit(chunk, chunksize, run_ind << LG_PAGE, size, arena->ind)) return (true); if (remove) { arena_run_split_remove(arena, chunk, run_ind, flag_dirty, flag_decommitted, need_pages); } if (zero) { if (flag_decommitted != 0) { /* The run is untouched, and therefore zeroed. */ JEMALLOC_VALGRIND_MAKE_MEM_DEFINED((void *)((uintptr_t)chunk + (run_ind << LG_PAGE)), (need_pages << LG_PAGE)); } else if (flag_dirty != 0) { /* The run is dirty, so all pages must be zeroed. */ arena_run_zero(chunk, run_ind, need_pages); } else { /* * The run is clean, so some pages may be zeroed (i.e. * never before touched). */ size_t i; for (i = 0; i < need_pages; i++) { if (arena_mapbits_unzeroed_get(chunk, run_ind+i) != 0) arena_run_zero(chunk, run_ind+i, 1); else if (config_debug) { arena_run_page_validate_zeroed(chunk, run_ind+i); } else { arena_run_page_mark_zeroed(chunk, run_ind+i); } } } } else { JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED((void *)((uintptr_t)chunk + (run_ind << LG_PAGE)), (need_pages << LG_PAGE)); } /* * Set the last element first, in case the run only contains one page * (i.e. both statements set the same element). */ flag_unzeroed_mask = (flag_dirty | flag_decommitted) == 0 ? CHUNK_MAP_UNZEROED : 0; arena_mapbits_large_set(chunk, run_ind+need_pages-1, 0, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, run_ind+need_pages-1))); arena_mapbits_large_set(chunk, run_ind, size, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, run_ind))); return (false); } static bool arena_run_split_large(arena_t *arena, arena_run_t *run, size_t size, bool zero) { return (arena_run_split_large_helper(arena, run, size, true, zero)); } static bool arena_run_init_large(arena_t *arena, arena_run_t *run, size_t size, bool zero) { return (arena_run_split_large_helper(arena, run, size, false, zero)); } static bool arena_run_split_small(arena_t *arena, arena_run_t *run, size_t size, szind_t binind) { arena_chunk_t *chunk; arena_chunk_map_misc_t *miscelm; size_t flag_dirty, flag_decommitted, run_ind, need_pages, i; assert(binind != BININD_INVALID); chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); miscelm = arena_run_to_miscelm(run); run_ind = arena_miscelm_to_pageind(miscelm); flag_dirty = arena_mapbits_dirty_get(chunk, run_ind); flag_decommitted = arena_mapbits_decommitted_get(chunk, run_ind); need_pages = (size >> LG_PAGE); assert(need_pages > 0); if (flag_decommitted != 0 && arena->chunk_hooks.commit(chunk, chunksize, run_ind << LG_PAGE, size, arena->ind)) return (true); arena_run_split_remove(arena, chunk, run_ind, flag_dirty, flag_decommitted, need_pages); for (i = 0; i < need_pages; i++) { size_t flag_unzeroed = arena_mapbits_unzeroed_get(chunk, run_ind+i); arena_mapbits_small_set(chunk, run_ind+i, i, binind, flag_unzeroed); if (config_debug && flag_dirty == 0 && flag_unzeroed == 0) arena_run_page_validate_zeroed(chunk, run_ind+i); } JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED((void *)((uintptr_t)chunk + (run_ind << LG_PAGE)), (need_pages << LG_PAGE)); return (false); } static arena_chunk_t * arena_chunk_init_spare(arena_t *arena) { arena_chunk_t *chunk; assert(arena->spare != NULL); chunk = arena->spare; arena->spare = NULL; assert(arena_mapbits_allocated_get(chunk, map_bias) == 0); assert(arena_mapbits_allocated_get(chunk, chunk_npages-1) == 0); assert(arena_mapbits_unallocated_size_get(chunk, map_bias) == arena_maxrun); assert(arena_mapbits_unallocated_size_get(chunk, chunk_npages-1) == arena_maxrun); assert(arena_mapbits_dirty_get(chunk, map_bias) == arena_mapbits_dirty_get(chunk, chunk_npages-1)); return (chunk); } static bool arena_chunk_register(arena_t *arena, arena_chunk_t *chunk, bool zero) { /* * The extent node notion of "committed" doesn't directly apply to * arena chunks. Arbitrarily mark them as committed. The commit state * of runs is tracked individually, and upon chunk deallocation the * entire chunk is in a consistent commit state. */ extent_node_init(&chunk->node, arena, chunk, chunksize, zero, true); extent_node_achunk_set(&chunk->node, true); return (chunk_register(chunk, &chunk->node)); } static arena_chunk_t * arena_chunk_alloc_internal_hard(arena_t *arena, chunk_hooks_t *chunk_hooks, bool *zero, bool *commit) { arena_chunk_t *chunk; malloc_mutex_unlock(&arena->lock); chunk = (arena_chunk_t *)chunk_alloc_wrapper(arena, chunk_hooks, NULL, chunksize, chunksize, zero, commit); if (chunk != NULL && !*commit) { /* Commit header. */ if (chunk_hooks->commit(chunk, chunksize, 0, map_bias << LG_PAGE, arena->ind)) { chunk_dalloc_wrapper(arena, chunk_hooks, (void *)chunk, chunksize, *commit); chunk = NULL; } } if (chunk != NULL && arena_chunk_register(arena, chunk, *zero)) { if (!*commit) { /* Undo commit of header. */ chunk_hooks->decommit(chunk, chunksize, 0, map_bias << LG_PAGE, arena->ind); } chunk_dalloc_wrapper(arena, chunk_hooks, (void *)chunk, chunksize, *commit); chunk = NULL; } malloc_mutex_lock(&arena->lock); return (chunk); } static arena_chunk_t * arena_chunk_alloc_internal(arena_t *arena, bool *zero, bool *commit) { arena_chunk_t *chunk; chunk_hooks_t chunk_hooks = CHUNK_HOOKS_INITIALIZER; chunk = chunk_alloc_cache(arena, &chunk_hooks, NULL, chunksize, chunksize, zero, true); if (chunk != NULL) { if (arena_chunk_register(arena, chunk, *zero)) { chunk_dalloc_cache(arena, &chunk_hooks, chunk, chunksize, true); return (NULL); } *commit = true; } if (chunk == NULL) { chunk = arena_chunk_alloc_internal_hard(arena, &chunk_hooks, zero, commit); } if (config_stats && chunk != NULL) { arena->stats.mapped += chunksize; arena->stats.metadata_mapped += (map_bias << LG_PAGE); } return (chunk); } static arena_chunk_t * arena_chunk_init_hard(arena_t *arena) { arena_chunk_t *chunk; bool zero, commit; size_t flag_unzeroed, flag_decommitted, i; assert(arena->spare == NULL); zero = false; commit = false; chunk = arena_chunk_alloc_internal(arena, &zero, &commit); if (chunk == NULL) return (NULL); /* * Initialize the map to contain one maximal free untouched run. Mark * the pages as zeroed if chunk_alloc() returned a zeroed or decommitted * chunk. */ flag_unzeroed = (zero || !commit) ? 0 : CHUNK_MAP_UNZEROED; flag_decommitted = commit ? 0 : CHUNK_MAP_DECOMMITTED; arena_mapbits_unallocated_set(chunk, map_bias, arena_maxrun, flag_unzeroed | flag_decommitted); /* * There is no need to initialize the internal page map entries unless * the chunk is not zeroed. */ if (!zero) { JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED( (void *)arena_bitselm_get(chunk, map_bias+1), (size_t)((uintptr_t) arena_bitselm_get(chunk, chunk_npages-1) - (uintptr_t)arena_bitselm_get(chunk, map_bias+1))); for (i = map_bias+1; i < chunk_npages-1; i++) arena_mapbits_internal_set(chunk, i, flag_unzeroed); } else { JEMALLOC_VALGRIND_MAKE_MEM_DEFINED((void *)arena_bitselm_get(chunk, map_bias+1), (size_t)((uintptr_t) arena_bitselm_get(chunk, chunk_npages-1) - (uintptr_t)arena_bitselm_get(chunk, map_bias+1))); if (config_debug) { for (i = map_bias+1; i < chunk_npages-1; i++) { assert(arena_mapbits_unzeroed_get(chunk, i) == flag_unzeroed); } } } arena_mapbits_unallocated_set(chunk, chunk_npages-1, arena_maxrun, flag_unzeroed); return (chunk); } static arena_chunk_t * arena_chunk_alloc(arena_t *arena) { arena_chunk_t *chunk; if (arena->spare != NULL) chunk = arena_chunk_init_spare(arena); else { chunk = arena_chunk_init_hard(arena); if (chunk == NULL) return (NULL); } /* Insert the run into the runs_avail tree. */ arena_avail_insert(arena, chunk, map_bias, chunk_npages-map_bias); return (chunk); } static void arena_chunk_dalloc(arena_t *arena, arena_chunk_t *chunk) { assert(arena_mapbits_allocated_get(chunk, map_bias) == 0); assert(arena_mapbits_allocated_get(chunk, chunk_npages-1) == 0); assert(arena_mapbits_unallocated_size_get(chunk, map_bias) == arena_maxrun); assert(arena_mapbits_unallocated_size_get(chunk, chunk_npages-1) == arena_maxrun); assert(arena_mapbits_dirty_get(chunk, map_bias) == arena_mapbits_dirty_get(chunk, chunk_npages-1)); assert(arena_mapbits_decommitted_get(chunk, map_bias) == arena_mapbits_decommitted_get(chunk, chunk_npages-1)); /* * Remove run from the runs_avail tree, so that the arena does not use * it. */ arena_avail_remove(arena, chunk, map_bias, chunk_npages-map_bias); if (arena->spare != NULL) { arena_chunk_t *spare = arena->spare; chunk_hooks_t chunk_hooks = CHUNK_HOOKS_INITIALIZER; bool committed; arena->spare = chunk; if (arena_mapbits_dirty_get(spare, map_bias) != 0) { arena_run_dirty_remove(arena, spare, map_bias, chunk_npages-map_bias); } chunk_deregister(spare, &spare->node); committed = (arena_mapbits_decommitted_get(spare, map_bias) == 0); if (!committed) { /* * Decommit the header. Mark the chunk as decommitted * even if header decommit fails, since treating a * partially committed chunk as committed has a high * potential for causing later access of decommitted * memory. */ chunk_hooks = chunk_hooks_get(arena); chunk_hooks.decommit(spare, chunksize, 0, map_bias << LG_PAGE, arena->ind); } chunk_dalloc_cache(arena, &chunk_hooks, (void *)spare, chunksize, committed); if (config_stats) { arena->stats.mapped -= chunksize; arena->stats.metadata_mapped -= (map_bias << LG_PAGE); } } else arena->spare = chunk; } static void arena_huge_malloc_stats_update(arena_t *arena, size_t usize) { szind_t index = size2index(usize) - nlclasses - NBINS; cassert(config_stats); arena->stats.nmalloc_huge++; arena->stats.allocated_huge += usize; arena->stats.hstats[index].nmalloc++; arena->stats.hstats[index].curhchunks++; } static void arena_huge_malloc_stats_update_undo(arena_t *arena, size_t usize) { szind_t index = size2index(usize) - nlclasses - NBINS; cassert(config_stats); arena->stats.nmalloc_huge--; arena->stats.allocated_huge -= usize; arena->stats.hstats[index].nmalloc--; arena->stats.hstats[index].curhchunks--; } static void arena_huge_dalloc_stats_update(arena_t *arena, size_t usize) { szind_t index = size2index(usize) - nlclasses - NBINS; cassert(config_stats); arena->stats.ndalloc_huge++; arena->stats.allocated_huge -= usize; arena->stats.hstats[index].ndalloc++; arena->stats.hstats[index].curhchunks--; } static void arena_huge_dalloc_stats_update_undo(arena_t *arena, size_t usize) { szind_t index = size2index(usize) - nlclasses - NBINS; cassert(config_stats); arena->stats.ndalloc_huge--; arena->stats.allocated_huge += usize; arena->stats.hstats[index].ndalloc--; arena->stats.hstats[index].curhchunks++; } static void arena_huge_ralloc_stats_update(arena_t *arena, size_t oldsize, size_t usize) { arena_huge_dalloc_stats_update(arena, oldsize); arena_huge_malloc_stats_update(arena, usize); } static void arena_huge_ralloc_stats_update_undo(arena_t *arena, size_t oldsize, size_t usize) { arena_huge_dalloc_stats_update_undo(arena, oldsize); arena_huge_malloc_stats_update_undo(arena, usize); } extent_node_t * arena_node_alloc(arena_t *arena) { extent_node_t *node; malloc_mutex_lock(&arena->node_cache_mtx); node = ql_last(&arena->node_cache, ql_link); if (node == NULL) { malloc_mutex_unlock(&arena->node_cache_mtx); return (base_alloc(sizeof(extent_node_t))); } ql_tail_remove(&arena->node_cache, extent_node_t, ql_link); malloc_mutex_unlock(&arena->node_cache_mtx); return (node); } void arena_node_dalloc(arena_t *arena, extent_node_t *node) { malloc_mutex_lock(&arena->node_cache_mtx); ql_elm_new(node, ql_link); ql_tail_insert(&arena->node_cache, node, ql_link); malloc_mutex_unlock(&arena->node_cache_mtx); } static void * arena_chunk_alloc_huge_hard(arena_t *arena, chunk_hooks_t *chunk_hooks, size_t usize, size_t alignment, bool *zero, size_t csize) { void *ret; bool commit = true; ret = chunk_alloc_wrapper(arena, chunk_hooks, NULL, csize, alignment, zero, &commit); if (ret == NULL) { /* Revert optimistic stats updates. */ malloc_mutex_lock(&arena->lock); if (config_stats) { arena_huge_malloc_stats_update_undo(arena, usize); arena->stats.mapped -= usize; } arena->nactive -= (usize >> LG_PAGE); malloc_mutex_unlock(&arena->lock); } return (ret); } void * arena_chunk_alloc_huge(arena_t *arena, size_t usize, size_t alignment, bool *zero) { void *ret; chunk_hooks_t chunk_hooks = CHUNK_HOOKS_INITIALIZER; size_t csize = CHUNK_CEILING(usize); malloc_mutex_lock(&arena->lock); /* Optimistically update stats. */ if (config_stats) { arena_huge_malloc_stats_update(arena, usize); arena->stats.mapped += usize; } arena->nactive += (usize >> LG_PAGE); ret = chunk_alloc_cache(arena, &chunk_hooks, NULL, csize, alignment, zero, true); malloc_mutex_unlock(&arena->lock); if (ret == NULL) { ret = arena_chunk_alloc_huge_hard(arena, &chunk_hooks, usize, alignment, zero, csize); } if (config_stats && ret != NULL) stats_cactive_add(usize); return (ret); } void arena_chunk_dalloc_huge(arena_t *arena, void *chunk, size_t usize) { chunk_hooks_t chunk_hooks = CHUNK_HOOKS_INITIALIZER; size_t csize; csize = CHUNK_CEILING(usize); malloc_mutex_lock(&arena->lock); if (config_stats) { arena_huge_dalloc_stats_update(arena, usize); arena->stats.mapped -= usize; stats_cactive_sub(usize); } arena->nactive -= (usize >> LG_PAGE); chunk_dalloc_cache(arena, &chunk_hooks, chunk, csize, true); malloc_mutex_unlock(&arena->lock); } void arena_chunk_ralloc_huge_similar(arena_t *arena, void *chunk, size_t oldsize, size_t usize) { assert(CHUNK_CEILING(oldsize) == CHUNK_CEILING(usize)); assert(oldsize != usize); malloc_mutex_lock(&arena->lock); if (config_stats) arena_huge_ralloc_stats_update(arena, oldsize, usize); if (oldsize < usize) { size_t udiff = usize - oldsize; arena->nactive += udiff >> LG_PAGE; if (config_stats) stats_cactive_add(udiff); } else { size_t udiff = oldsize - usize; arena->nactive -= udiff >> LG_PAGE; if (config_stats) stats_cactive_sub(udiff); } malloc_mutex_unlock(&arena->lock); } void arena_chunk_ralloc_huge_shrink(arena_t *arena, void *chunk, size_t oldsize, size_t usize) { size_t udiff = oldsize - usize; size_t cdiff = CHUNK_CEILING(oldsize) - CHUNK_CEILING(usize); malloc_mutex_lock(&arena->lock); if (config_stats) { arena_huge_ralloc_stats_update(arena, oldsize, usize); if (cdiff != 0) { arena->stats.mapped -= cdiff; stats_cactive_sub(udiff); } } arena->nactive -= udiff >> LG_PAGE; if (cdiff != 0) { chunk_hooks_t chunk_hooks = CHUNK_HOOKS_INITIALIZER; void *nchunk = (void *)((uintptr_t)chunk + CHUNK_CEILING(usize)); chunk_dalloc_cache(arena, &chunk_hooks, nchunk, cdiff, true); } malloc_mutex_unlock(&arena->lock); } static bool arena_chunk_ralloc_huge_expand_hard(arena_t *arena, chunk_hooks_t *chunk_hooks, void *chunk, size_t oldsize, size_t usize, bool *zero, void *nchunk, size_t udiff, size_t cdiff) { bool err; bool commit = true; err = (chunk_alloc_wrapper(arena, chunk_hooks, nchunk, cdiff, chunksize, zero, &commit) == NULL); if (err) { /* Revert optimistic stats updates. */ malloc_mutex_lock(&arena->lock); if (config_stats) { arena_huge_ralloc_stats_update_undo(arena, oldsize, usize); arena->stats.mapped -= cdiff; } arena->nactive -= (udiff >> LG_PAGE); malloc_mutex_unlock(&arena->lock); } else if (chunk_hooks->merge(chunk, CHUNK_CEILING(oldsize), nchunk, cdiff, true, arena->ind)) { chunk_dalloc_arena(arena, chunk_hooks, nchunk, cdiff, *zero, true); err = true; } return (err); } bool arena_chunk_ralloc_huge_expand(arena_t *arena, void *chunk, size_t oldsize, size_t usize, bool *zero) { bool err; chunk_hooks_t chunk_hooks = chunk_hooks_get(arena); void *nchunk = (void *)((uintptr_t)chunk + CHUNK_CEILING(oldsize)); size_t udiff = usize - oldsize; size_t cdiff = CHUNK_CEILING(usize) - CHUNK_CEILING(oldsize); malloc_mutex_lock(&arena->lock); /* Optimistically update stats. */ if (config_stats) { arena_huge_ralloc_stats_update(arena, oldsize, usize); arena->stats.mapped += cdiff; } arena->nactive += (udiff >> LG_PAGE); err = (chunk_alloc_cache(arena, &arena->chunk_hooks, nchunk, cdiff, chunksize, zero, true) == NULL); malloc_mutex_unlock(&arena->lock); if (err) { err = arena_chunk_ralloc_huge_expand_hard(arena, &chunk_hooks, chunk, oldsize, usize, zero, nchunk, udiff, cdiff); } else if (chunk_hooks.merge(chunk, CHUNK_CEILING(oldsize), nchunk, cdiff, true, arena->ind)) { chunk_dalloc_arena(arena, &chunk_hooks, nchunk, cdiff, *zero, true); err = true; } if (config_stats && !err) stats_cactive_add(udiff); return (err); } /* * Do first-best-fit run selection, i.e. select the lowest run that best fits. * Run sizes are quantized, so not all candidate runs are necessarily exactly * the same size. */ static arena_run_t * arena_run_first_best_fit(arena_t *arena, size_t size) { size_t search_size = run_quantize_first(size); arena_chunk_map_misc_t *key = arena_miscelm_key_create(search_size); arena_chunk_map_misc_t *miscelm = arena_avail_tree_nsearch(&arena->runs_avail, key); if (miscelm == NULL) return (NULL); return (&miscelm->run); } static arena_run_t * arena_run_alloc_large_helper(arena_t *arena, size_t size, bool zero) { arena_run_t *run = arena_run_first_best_fit(arena, s2u(size)); if (run != NULL) { if (arena_run_split_large(arena, run, size, zero)) run = NULL; } return (run); } static arena_run_t * arena_run_alloc_large(arena_t *arena, size_t size, bool zero) { arena_chunk_t *chunk; arena_run_t *run; assert(size <= arena_maxrun); assert(size == PAGE_CEILING(size)); /* Search the arena's chunks for the lowest best fit. */ run = arena_run_alloc_large_helper(arena, size, zero); if (run != NULL) return (run); /* * No usable runs. Create a new chunk from which to allocate the run. */ chunk = arena_chunk_alloc(arena); if (chunk != NULL) { run = &arena_miscelm_get(chunk, map_bias)->run; if (arena_run_split_large(arena, run, size, zero)) run = NULL; return (run); } /* * arena_chunk_alloc() failed, but another thread may have made * sufficient memory available while this one dropped arena->lock in * arena_chunk_alloc(), so search one more time. */ return (arena_run_alloc_large_helper(arena, size, zero)); } static arena_run_t * arena_run_alloc_small_helper(arena_t *arena, size_t size, szind_t binind) { arena_run_t *run = arena_run_first_best_fit(arena, size); if (run != NULL) { if (arena_run_split_small(arena, run, size, binind)) run = NULL; } return (run); } static arena_run_t * arena_run_alloc_small(arena_t *arena, size_t size, szind_t binind) { arena_chunk_t *chunk; arena_run_t *run; assert(size <= arena_maxrun); assert(size == PAGE_CEILING(size)); assert(binind != BININD_INVALID); /* Search the arena's chunks for the lowest best fit. */ run = arena_run_alloc_small_helper(arena, size, binind); if (run != NULL) return (run); /* * No usable runs. Create a new chunk from which to allocate the run. */ chunk = arena_chunk_alloc(arena); if (chunk != NULL) { run = &arena_miscelm_get(chunk, map_bias)->run; if (arena_run_split_small(arena, run, size, binind)) run = NULL; return (run); } /* * arena_chunk_alloc() failed, but another thread may have made * sufficient memory available while this one dropped arena->lock in * arena_chunk_alloc(), so search one more time. */ return (arena_run_alloc_small_helper(arena, size, binind)); } static bool arena_lg_dirty_mult_valid(ssize_t lg_dirty_mult) { return (lg_dirty_mult >= -1 && lg_dirty_mult < (ssize_t)(sizeof(size_t) << 3)); } ssize_t arena_lg_dirty_mult_get(arena_t *arena) { ssize_t lg_dirty_mult; malloc_mutex_lock(&arena->lock); lg_dirty_mult = arena->lg_dirty_mult; malloc_mutex_unlock(&arena->lock); return (lg_dirty_mult); } bool arena_lg_dirty_mult_set(arena_t *arena, ssize_t lg_dirty_mult) { if (!arena_lg_dirty_mult_valid(lg_dirty_mult)) return (true); malloc_mutex_lock(&arena->lock); arena->lg_dirty_mult = lg_dirty_mult; arena_maybe_purge(arena); malloc_mutex_unlock(&arena->lock); return (false); } void arena_maybe_purge(arena_t *arena) { /* Don't purge if the option is disabled. */ if (arena->lg_dirty_mult < 0) return; /* Don't recursively purge. */ if (arena->purging) return; /* * Iterate, since preventing recursive purging could otherwise leave too * many dirty pages. */ while (true) { size_t threshold = (arena->nactive >> arena->lg_dirty_mult); if (threshold < chunk_npages) threshold = chunk_npages; /* * Don't purge unless the number of purgeable pages exceeds the * threshold. */ if (arena->ndirty <= threshold) return; arena_purge(arena, false); } } static size_t arena_dirty_count(arena_t *arena) { size_t ndirty = 0; arena_runs_dirty_link_t *rdelm; extent_node_t *chunkselm; for (rdelm = qr_next(&arena->runs_dirty, rd_link), chunkselm = qr_next(&arena->chunks_cache, cc_link); rdelm != &arena->runs_dirty; rdelm = qr_next(rdelm, rd_link)) { size_t npages; if (rdelm == &chunkselm->rd) { npages = extent_node_size_get(chunkselm) >> LG_PAGE; chunkselm = qr_next(chunkselm, cc_link); } else { arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE( rdelm); arena_chunk_map_misc_t *miscelm = arena_rd_to_miscelm(rdelm); size_t pageind = arena_miscelm_to_pageind(miscelm); assert(arena_mapbits_allocated_get(chunk, pageind) == 0); assert(arena_mapbits_large_get(chunk, pageind) == 0); assert(arena_mapbits_dirty_get(chunk, pageind) != 0); npages = arena_mapbits_unallocated_size_get(chunk, pageind) >> LG_PAGE; } ndirty += npages; } return (ndirty); } static size_t arena_compute_npurge(arena_t *arena, bool all) { size_t npurge; /* * Compute the minimum number of pages that this thread should try to * purge. */ if (!all) { size_t threshold = (arena->nactive >> arena->lg_dirty_mult); threshold = threshold < chunk_npages ? chunk_npages : threshold; npurge = arena->ndirty - threshold; } else npurge = arena->ndirty; return (npurge); } static size_t arena_stash_dirty(arena_t *arena, chunk_hooks_t *chunk_hooks, bool all, size_t npurge, arena_runs_dirty_link_t *purge_runs_sentinel, extent_node_t *purge_chunks_sentinel) { arena_runs_dirty_link_t *rdelm, *rdelm_next; extent_node_t *chunkselm; size_t nstashed = 0; /* Stash at least npurge pages. */ for (rdelm = qr_next(&arena->runs_dirty, rd_link), chunkselm = qr_next(&arena->chunks_cache, cc_link); rdelm != &arena->runs_dirty; rdelm = rdelm_next) { size_t npages; rdelm_next = qr_next(rdelm, rd_link); if (rdelm == &chunkselm->rd) { extent_node_t *chunkselm_next; bool zero; UNUSED void *chunk; chunkselm_next = qr_next(chunkselm, cc_link); /* * Allocate. chunkselm remains valid due to the * dalloc_node=false argument to chunk_alloc_cache(). */ zero = false; chunk = chunk_alloc_cache(arena, chunk_hooks, extent_node_addr_get(chunkselm), extent_node_size_get(chunkselm), chunksize, &zero, false); assert(chunk == extent_node_addr_get(chunkselm)); assert(zero == extent_node_zeroed_get(chunkselm)); extent_node_dirty_insert(chunkselm, purge_runs_sentinel, purge_chunks_sentinel); npages = extent_node_size_get(chunkselm) >> LG_PAGE; chunkselm = chunkselm_next; } else { arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(rdelm); arena_chunk_map_misc_t *miscelm = arena_rd_to_miscelm(rdelm); size_t pageind = arena_miscelm_to_pageind(miscelm); arena_run_t *run = &miscelm->run; size_t run_size = arena_mapbits_unallocated_size_get(chunk, pageind); npages = run_size >> LG_PAGE; assert(pageind + npages <= chunk_npages); assert(arena_mapbits_dirty_get(chunk, pageind) == arena_mapbits_dirty_get(chunk, pageind+npages-1)); /* * If purging the spare chunk's run, make it available * prior to allocation. */ if (chunk == arena->spare) arena_chunk_alloc(arena); /* Temporarily allocate the free dirty run. */ arena_run_split_large(arena, run, run_size, false); /* Stash. */ if (false) qr_new(rdelm, rd_link); /* Redundant. */ else { assert(qr_next(rdelm, rd_link) == rdelm); assert(qr_prev(rdelm, rd_link) == rdelm); } qr_meld(purge_runs_sentinel, rdelm, rd_link); } nstashed += npages; if (!all && nstashed >= npurge) break; } return (nstashed); } static size_t arena_purge_stashed(arena_t *arena, chunk_hooks_t *chunk_hooks, arena_runs_dirty_link_t *purge_runs_sentinel, extent_node_t *purge_chunks_sentinel) { size_t npurged, nmadvise; arena_runs_dirty_link_t *rdelm; extent_node_t *chunkselm; if (config_stats) nmadvise = 0; npurged = 0; malloc_mutex_unlock(&arena->lock); for (rdelm = qr_next(purge_runs_sentinel, rd_link), chunkselm = qr_next(purge_chunks_sentinel, cc_link); rdelm != purge_runs_sentinel; rdelm = qr_next(rdelm, rd_link)) { size_t npages; if (rdelm == &chunkselm->rd) { /* * Don't actually purge the chunk here because 1) * chunkselm is embedded in the chunk and must remain * valid, and 2) we deallocate the chunk in * arena_unstash_purged(), where it is destroyed, * decommitted, or purged, depending on chunk * deallocation policy. */ size_t size = extent_node_size_get(chunkselm); npages = size >> LG_PAGE; chunkselm = qr_next(chunkselm, cc_link); } else { size_t pageind, run_size, flag_unzeroed, flags, i; bool decommitted; arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(rdelm); arena_chunk_map_misc_t *miscelm = arena_rd_to_miscelm(rdelm); pageind = arena_miscelm_to_pageind(miscelm); run_size = arena_mapbits_large_size_get(chunk, pageind); npages = run_size >> LG_PAGE; assert(pageind + npages <= chunk_npages); assert(!arena_mapbits_decommitted_get(chunk, pageind)); assert(!arena_mapbits_decommitted_get(chunk, pageind+npages-1)); decommitted = !chunk_hooks->decommit(chunk, chunksize, pageind << LG_PAGE, npages << LG_PAGE, arena->ind); if (decommitted) { flag_unzeroed = 0; flags = CHUNK_MAP_DECOMMITTED; } else { flag_unzeroed = chunk_purge_wrapper(arena, chunk_hooks, chunk, chunksize, pageind << LG_PAGE, run_size) ? CHUNK_MAP_UNZEROED : 0; flags = flag_unzeroed; } arena_mapbits_large_set(chunk, pageind+npages-1, 0, flags); arena_mapbits_large_set(chunk, pageind, run_size, flags); /* * Set the unzeroed flag for internal pages, now that * chunk_purge_wrapper() has returned whether the pages * were zeroed as a side effect of purging. This chunk * map modification is safe even though the arena mutex * isn't currently owned by this thread, because the run * is marked as allocated, thus protecting it from being * modified by any other thread. As long as these * writes don't perturb the first and last elements' * CHUNK_MAP_ALLOCATED bits, behavior is well defined. */ for (i = 1; i < npages-1; i++) { arena_mapbits_internal_set(chunk, pageind+i, flag_unzeroed); } } npurged += npages; if (config_stats) nmadvise++; } malloc_mutex_lock(&arena->lock); if (config_stats) { arena->stats.nmadvise += nmadvise; arena->stats.purged += npurged; } return (npurged); } static void arena_unstash_purged(arena_t *arena, chunk_hooks_t *chunk_hooks, arena_runs_dirty_link_t *purge_runs_sentinel, extent_node_t *purge_chunks_sentinel) { arena_runs_dirty_link_t *rdelm, *rdelm_next; extent_node_t *chunkselm; /* Deallocate chunks/runs. */ for (rdelm = qr_next(purge_runs_sentinel, rd_link), chunkselm = qr_next(purge_chunks_sentinel, cc_link); rdelm != purge_runs_sentinel; rdelm = rdelm_next) { rdelm_next = qr_next(rdelm, rd_link); if (rdelm == &chunkselm->rd) { extent_node_t *chunkselm_next = qr_next(chunkselm, cc_link); void *addr = extent_node_addr_get(chunkselm); size_t size = extent_node_size_get(chunkselm); bool zeroed = extent_node_zeroed_get(chunkselm); bool committed = extent_node_committed_get(chunkselm); extent_node_dirty_remove(chunkselm); arena_node_dalloc(arena, chunkselm); chunkselm = chunkselm_next; chunk_dalloc_arena(arena, chunk_hooks, addr, size, zeroed, committed); } else { arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(rdelm); arena_chunk_map_misc_t *miscelm = arena_rd_to_miscelm(rdelm); size_t pageind = arena_miscelm_to_pageind(miscelm); bool decommitted = (arena_mapbits_decommitted_get(chunk, pageind) != 0); arena_run_t *run = &miscelm->run; qr_remove(rdelm, rd_link); arena_run_dalloc(arena, run, false, true, decommitted); } } } static void arena_purge(arena_t *arena, bool all) { chunk_hooks_t chunk_hooks = chunk_hooks_get(arena); size_t npurge, npurgeable, npurged; arena_runs_dirty_link_t purge_runs_sentinel; extent_node_t purge_chunks_sentinel; arena->purging = true; /* * Calls to arena_dirty_count() are disabled even for debug builds * because overhead grows nonlinearly as memory usage increases. */ if (false && config_debug) { size_t ndirty = arena_dirty_count(arena); assert(ndirty == arena->ndirty); } assert((arena->nactive >> arena->lg_dirty_mult) < arena->ndirty || all); if (config_stats) arena->stats.npurge++; npurge = arena_compute_npurge(arena, all); qr_new(&purge_runs_sentinel, rd_link); extent_node_dirty_linkage_init(&purge_chunks_sentinel); npurgeable = arena_stash_dirty(arena, &chunk_hooks, all, npurge, &purge_runs_sentinel, &purge_chunks_sentinel); assert(npurgeable >= npurge); npurged = arena_purge_stashed(arena, &chunk_hooks, &purge_runs_sentinel, &purge_chunks_sentinel); assert(npurged == npurgeable); arena_unstash_purged(arena, &chunk_hooks, &purge_runs_sentinel, &purge_chunks_sentinel); arena->purging = false; } void arena_purge_all(arena_t *arena) { malloc_mutex_lock(&arena->lock); arena_purge(arena, true); malloc_mutex_unlock(&arena->lock); } static void arena_run_coalesce(arena_t *arena, arena_chunk_t *chunk, size_t *p_size, size_t *p_run_ind, size_t *p_run_pages, size_t flag_dirty, size_t flag_decommitted) { size_t size = *p_size; size_t run_ind = *p_run_ind; size_t run_pages = *p_run_pages; /* Try to coalesce forward. */ if (run_ind + run_pages < chunk_npages && arena_mapbits_allocated_get(chunk, run_ind+run_pages) == 0 && arena_mapbits_dirty_get(chunk, run_ind+run_pages) == flag_dirty && arena_mapbits_decommitted_get(chunk, run_ind+run_pages) == flag_decommitted) { size_t nrun_size = arena_mapbits_unallocated_size_get(chunk, run_ind+run_pages); size_t nrun_pages = nrun_size >> LG_PAGE; /* * Remove successor from runs_avail; the coalesced run is * inserted later. */ assert(arena_mapbits_unallocated_size_get(chunk, run_ind+run_pages+nrun_pages-1) == nrun_size); assert(arena_mapbits_dirty_get(chunk, run_ind+run_pages+nrun_pages-1) == flag_dirty); assert(arena_mapbits_decommitted_get(chunk, run_ind+run_pages+nrun_pages-1) == flag_decommitted); arena_avail_remove(arena, chunk, run_ind+run_pages, nrun_pages); /* * If the successor is dirty, remove it from the set of dirty * pages. */ if (flag_dirty != 0) { arena_run_dirty_remove(arena, chunk, run_ind+run_pages, nrun_pages); } size += nrun_size; run_pages += nrun_pages; arena_mapbits_unallocated_size_set(chunk, run_ind, size); arena_mapbits_unallocated_size_set(chunk, run_ind+run_pages-1, size); } /* Try to coalesce backward. */ if (run_ind > map_bias && arena_mapbits_allocated_get(chunk, run_ind-1) == 0 && arena_mapbits_dirty_get(chunk, run_ind-1) == flag_dirty && arena_mapbits_decommitted_get(chunk, run_ind-1) == flag_decommitted) { size_t prun_size = arena_mapbits_unallocated_size_get(chunk, run_ind-1); size_t prun_pages = prun_size >> LG_PAGE; run_ind -= prun_pages; /* * Remove predecessor from runs_avail; the coalesced run is * inserted later. */ assert(arena_mapbits_unallocated_size_get(chunk, run_ind) == prun_size); assert(arena_mapbits_dirty_get(chunk, run_ind) == flag_dirty); assert(arena_mapbits_decommitted_get(chunk, run_ind) == flag_decommitted); arena_avail_remove(arena, chunk, run_ind, prun_pages); /* * If the predecessor is dirty, remove it from the set of dirty * pages. */ if (flag_dirty != 0) { arena_run_dirty_remove(arena, chunk, run_ind, prun_pages); } size += prun_size; run_pages += prun_pages; arena_mapbits_unallocated_size_set(chunk, run_ind, size); arena_mapbits_unallocated_size_set(chunk, run_ind+run_pages-1, size); } *p_size = size; *p_run_ind = run_ind; *p_run_pages = run_pages; } static size_t arena_run_size_get(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, size_t run_ind) { size_t size; assert(run_ind >= map_bias); assert(run_ind < chunk_npages); if (arena_mapbits_large_get(chunk, run_ind) != 0) { size = arena_mapbits_large_size_get(chunk, run_ind); assert(size == PAGE || arena_mapbits_large_size_get(chunk, run_ind+(size>>LG_PAGE)-1) == 0); } else { arena_bin_info_t *bin_info = &arena_bin_info[run->binind]; size = bin_info->run_size; } return (size); } static bool arena_run_decommit(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run) { arena_chunk_map_misc_t *miscelm = arena_run_to_miscelm(run); size_t run_ind = arena_miscelm_to_pageind(miscelm); size_t offset = run_ind << LG_PAGE; size_t length = arena_run_size_get(arena, chunk, run, run_ind); return (arena->chunk_hooks.decommit(chunk, chunksize, offset, length, arena->ind)); } static void arena_run_dalloc(arena_t *arena, arena_run_t *run, bool dirty, bool cleaned, bool decommitted) { arena_chunk_t *chunk; arena_chunk_map_misc_t *miscelm; size_t size, run_ind, run_pages, flag_dirty, flag_decommitted; chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); miscelm = arena_run_to_miscelm(run); run_ind = arena_miscelm_to_pageind(miscelm); assert(run_ind >= map_bias); assert(run_ind < chunk_npages); size = arena_run_size_get(arena, chunk, run, run_ind); run_pages = (size >> LG_PAGE); arena_cactive_update(arena, 0, run_pages); arena->nactive -= run_pages; /* * The run is dirty if the caller claims to have dirtied it, as well as * if it was already dirty before being allocated and the caller * doesn't claim to have cleaned it. */ assert(arena_mapbits_dirty_get(chunk, run_ind) == arena_mapbits_dirty_get(chunk, run_ind+run_pages-1)); if (!cleaned && !decommitted && arena_mapbits_dirty_get(chunk, run_ind) != 0) dirty = true; flag_dirty = dirty ? CHUNK_MAP_DIRTY : 0; flag_decommitted = decommitted ? CHUNK_MAP_DECOMMITTED : 0; /* Mark pages as unallocated in the chunk map. */ if (dirty || decommitted) { size_t flags = flag_dirty | flag_decommitted; arena_mapbits_unallocated_set(chunk, run_ind, size, flags); arena_mapbits_unallocated_set(chunk, run_ind+run_pages-1, size, flags); } else { arena_mapbits_unallocated_set(chunk, run_ind, size, arena_mapbits_unzeroed_get(chunk, run_ind)); arena_mapbits_unallocated_set(chunk, run_ind+run_pages-1, size, arena_mapbits_unzeroed_get(chunk, run_ind+run_pages-1)); } arena_run_coalesce(arena, chunk, &size, &run_ind, &run_pages, flag_dirty, flag_decommitted); /* Insert into runs_avail, now that coalescing is complete. */ assert(arena_mapbits_unallocated_size_get(chunk, run_ind) == arena_mapbits_unallocated_size_get(chunk, run_ind+run_pages-1)); assert(arena_mapbits_dirty_get(chunk, run_ind) == arena_mapbits_dirty_get(chunk, run_ind+run_pages-1)); assert(arena_mapbits_decommitted_get(chunk, run_ind) == arena_mapbits_decommitted_get(chunk, run_ind+run_pages-1)); arena_avail_insert(arena, chunk, run_ind, run_pages); if (dirty) arena_run_dirty_insert(arena, chunk, run_ind, run_pages); /* Deallocate chunk if it is now completely unused. */ if (size == arena_maxrun) { assert(run_ind == map_bias); assert(run_pages == (arena_maxrun >> LG_PAGE)); arena_chunk_dalloc(arena, chunk); } /* * It is okay to do dirty page processing here even if the chunk was * deallocated above, since in that case it is the spare. Waiting * until after possible chunk deallocation to do dirty processing * allows for an old spare to be fully deallocated, thus decreasing the * chances of spuriously crossing the dirty page purging threshold. */ if (dirty) arena_maybe_purge(arena); } static void arena_run_dalloc_decommit(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run) { bool committed = arena_run_decommit(arena, chunk, run); arena_run_dalloc(arena, run, committed, false, !committed); } static void arena_run_trim_head(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, size_t oldsize, size_t newsize) { arena_chunk_map_misc_t *miscelm = arena_run_to_miscelm(run); size_t pageind = arena_miscelm_to_pageind(miscelm); size_t head_npages = (oldsize - newsize) >> LG_PAGE; size_t flag_dirty = arena_mapbits_dirty_get(chunk, pageind); size_t flag_decommitted = arena_mapbits_decommitted_get(chunk, pageind); size_t flag_unzeroed_mask = (flag_dirty | flag_decommitted) == 0 ? CHUNK_MAP_UNZEROED : 0; assert(oldsize > newsize); /* * Update the chunk map so that arena_run_dalloc() can treat the * leading run as separately allocated. Set the last element of each * run first, in case of single-page runs. */ assert(arena_mapbits_large_size_get(chunk, pageind) == oldsize); arena_mapbits_large_set(chunk, pageind+head_npages-1, 0, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind+head_npages-1))); arena_mapbits_large_set(chunk, pageind, oldsize-newsize, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind))); if (config_debug) { UNUSED size_t tail_npages = newsize >> LG_PAGE; assert(arena_mapbits_large_size_get(chunk, pageind+head_npages+tail_npages-1) == 0); assert(arena_mapbits_dirty_get(chunk, pageind+head_npages+tail_npages-1) == flag_dirty); } arena_mapbits_large_set(chunk, pageind+head_npages, newsize, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind+head_npages))); arena_run_dalloc(arena, run, false, false, (flag_decommitted != 0)); } static void arena_run_trim_tail(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, size_t oldsize, size_t newsize, bool dirty) { arena_chunk_map_misc_t *miscelm = arena_run_to_miscelm(run); size_t pageind = arena_miscelm_to_pageind(miscelm); size_t head_npages = newsize >> LG_PAGE; size_t flag_dirty = arena_mapbits_dirty_get(chunk, pageind); size_t flag_decommitted = arena_mapbits_decommitted_get(chunk, pageind); size_t flag_unzeroed_mask = (flag_dirty | flag_decommitted) == 0 ? CHUNK_MAP_UNZEROED : 0; arena_chunk_map_misc_t *tail_miscelm; arena_run_t *tail_run; assert(oldsize > newsize); /* * Update the chunk map so that arena_run_dalloc() can treat the * trailing run as separately allocated. Set the last element of each * run first, in case of single-page runs. */ assert(arena_mapbits_large_size_get(chunk, pageind) == oldsize); arena_mapbits_large_set(chunk, pageind+head_npages-1, 0, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind+head_npages-1))); arena_mapbits_large_set(chunk, pageind, newsize, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind))); if (config_debug) { UNUSED size_t tail_npages = (oldsize - newsize) >> LG_PAGE; assert(arena_mapbits_large_size_get(chunk, pageind+head_npages+tail_npages-1) == 0); assert(arena_mapbits_dirty_get(chunk, pageind+head_npages+tail_npages-1) == flag_dirty); } arena_mapbits_large_set(chunk, pageind+head_npages, oldsize-newsize, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind+head_npages))); tail_miscelm = arena_miscelm_get(chunk, pageind + head_npages); tail_run = &tail_miscelm->run; arena_run_dalloc(arena, tail_run, dirty, false, (flag_decommitted != 0)); } static arena_run_t * arena_bin_runs_first(arena_bin_t *bin) { arena_chunk_map_misc_t *miscelm = arena_run_tree_first(&bin->runs); if (miscelm != NULL) return (&miscelm->run); return (NULL); } static void arena_bin_runs_insert(arena_bin_t *bin, arena_run_t *run) { arena_chunk_map_misc_t *miscelm = arena_run_to_miscelm(run); assert(arena_run_tree_search(&bin->runs, miscelm) == NULL); arena_run_tree_insert(&bin->runs, miscelm); } static void arena_bin_runs_remove(arena_bin_t *bin, arena_run_t *run) { arena_chunk_map_misc_t *miscelm = arena_run_to_miscelm(run); assert(arena_run_tree_search(&bin->runs, miscelm) != NULL); arena_run_tree_remove(&bin->runs, miscelm); } static arena_run_t * arena_bin_nonfull_run_tryget(arena_bin_t *bin) { arena_run_t *run = arena_bin_runs_first(bin); if (run != NULL) { arena_bin_runs_remove(bin, run); if (config_stats) bin->stats.reruns++; } return (run); } static arena_run_t * arena_bin_nonfull_run_get(arena_t *arena, arena_bin_t *bin) { arena_run_t *run; szind_t binind; arena_bin_info_t *bin_info; /* Look for a usable run. */ run = arena_bin_nonfull_run_tryget(bin); if (run != NULL) return (run); /* No existing runs have any space available. */ binind = arena_bin_index(arena, bin); bin_info = &arena_bin_info[binind]; /* Allocate a new run. */ malloc_mutex_unlock(&bin->lock); /******************************/ malloc_mutex_lock(&arena->lock); run = arena_run_alloc_small(arena, bin_info->run_size, binind); if (run != NULL) { /* Initialize run internals. */ run->binind = binind; run->nfree = bin_info->nregs; bitmap_init(run->bitmap, &bin_info->bitmap_info); } malloc_mutex_unlock(&arena->lock); /********************************/ malloc_mutex_lock(&bin->lock); if (run != NULL) { if (config_stats) { bin->stats.nruns++; bin->stats.curruns++; } return (run); } /* * arena_run_alloc_small() failed, but another thread may have made * sufficient memory available while this one dropped bin->lock above, * so search one more time. */ run = arena_bin_nonfull_run_tryget(bin); if (run != NULL) return (run); return (NULL); } /* Re-fill bin->runcur, then call arena_run_reg_alloc(). */ static void * arena_bin_malloc_hard(arena_t *arena, arena_bin_t *bin) { szind_t binind; arena_bin_info_t *bin_info; arena_run_t *run; binind = arena_bin_index(arena, bin); bin_info = &arena_bin_info[binind]; bin->runcur = NULL; run = arena_bin_nonfull_run_get(arena, bin); if (bin->runcur != NULL && bin->runcur->nfree > 0) { /* * Another thread updated runcur while this one ran without the * bin lock in arena_bin_nonfull_run_get(). */ void *ret; assert(bin->runcur->nfree > 0); ret = arena_run_reg_alloc(bin->runcur, bin_info); if (run != NULL) { arena_chunk_t *chunk; /* * arena_run_alloc_small() may have allocated run, or * it may have pulled run from the bin's run tree. * Therefore it is unsafe to make any assumptions about * how run has previously been used, and * arena_bin_lower_run() must be called, as if a region * were just deallocated from the run. */ chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); if (run->nfree == bin_info->nregs) arena_dalloc_bin_run(arena, chunk, run, bin); else arena_bin_lower_run(arena, chunk, run, bin); } return (ret); } if (run == NULL) return (NULL); bin->runcur = run; assert(bin->runcur->nfree > 0); return (arena_run_reg_alloc(bin->runcur, bin_info)); } void arena_tcache_fill_small(arena_t *arena, tcache_bin_t *tbin, szind_t binind, uint64_t prof_accumbytes) { unsigned i, nfill; arena_bin_t *bin; assert(tbin->ncached == 0); if (config_prof && arena_prof_accum(arena, prof_accumbytes)) prof_idump(); bin = &arena->bins[binind]; malloc_mutex_lock(&bin->lock); for (i = 0, nfill = (tcache_bin_info[binind].ncached_max >> tbin->lg_fill_div); i < nfill; i++) { arena_run_t *run; void *ptr; if ((run = bin->runcur) != NULL && run->nfree > 0) ptr = arena_run_reg_alloc(run, &arena_bin_info[binind]); else ptr = arena_bin_malloc_hard(arena, bin); if (ptr == NULL) { /* * OOM. tbin->avail isn't yet filled down to its first * element, so the successful allocations (if any) must * be moved to the base of tbin->avail before bailing * out. */ if (i > 0) { memmove(tbin->avail, &tbin->avail[nfill - i], i * sizeof(void *)); } break; } if (config_fill && unlikely(opt_junk_alloc)) { arena_alloc_junk_small(ptr, &arena_bin_info[binind], true); } /* Insert such that low regions get used first. */ tbin->avail[nfill - 1 - i] = ptr; } if (config_stats) { bin->stats.nmalloc += i; bin->stats.nrequests += tbin->tstats.nrequests; bin->stats.curregs += i; bin->stats.nfills++; tbin->tstats.nrequests = 0; } malloc_mutex_unlock(&bin->lock); tbin->ncached = i; } void arena_alloc_junk_small(void *ptr, arena_bin_info_t *bin_info, bool zero) { if (zero) { size_t redzone_size = bin_info->redzone_size; memset((void *)((uintptr_t)ptr - redzone_size), 0xa5, redzone_size); memset((void *)((uintptr_t)ptr + bin_info->reg_size), 0xa5, redzone_size); } else { memset((void *)((uintptr_t)ptr - bin_info->redzone_size), 0xa5, bin_info->reg_interval); } } #ifdef JEMALLOC_JET #undef arena_redzone_corruption #define arena_redzone_corruption JEMALLOC_N(arena_redzone_corruption_impl) #endif static void arena_redzone_corruption(void *ptr, size_t usize, bool after, size_t offset, uint8_t byte) { malloc_printf(": Corrupt redzone %zu byte%s %s %p " "(size %zu), byte=%#x\n", offset, (offset == 1) ? "" : "s", after ? "after" : "before", ptr, usize, byte); } #ifdef JEMALLOC_JET #undef arena_redzone_corruption #define arena_redzone_corruption JEMALLOC_N(arena_redzone_corruption) arena_redzone_corruption_t *arena_redzone_corruption = JEMALLOC_N(arena_redzone_corruption_impl); #endif static void arena_redzones_validate(void *ptr, arena_bin_info_t *bin_info, bool reset) { bool error = false; if (opt_junk_alloc) { size_t size = bin_info->reg_size; size_t redzone_size = bin_info->redzone_size; size_t i; for (i = 1; i <= redzone_size; i++) { uint8_t *byte = (uint8_t *)((uintptr_t)ptr - i); if (*byte != 0xa5) { error = true; arena_redzone_corruption(ptr, size, false, i, *byte); if (reset) *byte = 0xa5; } } for (i = 0; i < redzone_size; i++) { uint8_t *byte = (uint8_t *)((uintptr_t)ptr + size + i); if (*byte != 0xa5) { error = true; arena_redzone_corruption(ptr, size, true, i, *byte); if (reset) *byte = 0xa5; } } } if (opt_abort && error) abort(); } #ifdef JEMALLOC_JET #undef arena_dalloc_junk_small #define arena_dalloc_junk_small JEMALLOC_N(arena_dalloc_junk_small_impl) #endif void arena_dalloc_junk_small(void *ptr, arena_bin_info_t *bin_info) { size_t redzone_size = bin_info->redzone_size; arena_redzones_validate(ptr, bin_info, false); memset((void *)((uintptr_t)ptr - redzone_size), 0x5a, bin_info->reg_interval); } #ifdef JEMALLOC_JET #undef arena_dalloc_junk_small #define arena_dalloc_junk_small JEMALLOC_N(arena_dalloc_junk_small) arena_dalloc_junk_small_t *arena_dalloc_junk_small = JEMALLOC_N(arena_dalloc_junk_small_impl); #endif void arena_quarantine_junk_small(void *ptr, size_t usize) { szind_t binind; arena_bin_info_t *bin_info; cassert(config_fill); assert(opt_junk_free); assert(opt_quarantine); assert(usize <= SMALL_MAXCLASS); binind = size2index(usize); bin_info = &arena_bin_info[binind]; arena_redzones_validate(ptr, bin_info, true); } void * arena_malloc_small(arena_t *arena, size_t size, bool zero) { void *ret; arena_bin_t *bin; arena_run_t *run; szind_t binind; binind = size2index(size); assert(binind < NBINS); bin = &arena->bins[binind]; size = index2size(binind); malloc_mutex_lock(&bin->lock); if ((run = bin->runcur) != NULL && run->nfree > 0) ret = arena_run_reg_alloc(run, &arena_bin_info[binind]); else ret = arena_bin_malloc_hard(arena, bin); if (ret == NULL) { malloc_mutex_unlock(&bin->lock); return (NULL); } if (config_stats) { bin->stats.nmalloc++; bin->stats.nrequests++; bin->stats.curregs++; } malloc_mutex_unlock(&bin->lock); if (config_prof && !isthreaded && arena_prof_accum(arena, size)) prof_idump(); if (!zero) { if (config_fill) { if (unlikely(opt_junk_alloc)) { arena_alloc_junk_small(ret, &arena_bin_info[binind], false); } else if (unlikely(opt_zero)) memset(ret, 0, size); } JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED(ret, size); } else { if (config_fill && unlikely(opt_junk_alloc)) { arena_alloc_junk_small(ret, &arena_bin_info[binind], true); } JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED(ret, size); memset(ret, 0, size); } return (ret); } void * arena_malloc_large(arena_t *arena, size_t size, bool zero) { void *ret; size_t usize; uintptr_t random_offset; arena_run_t *run; arena_chunk_map_misc_t *miscelm; UNUSED bool idump; /* Large allocation. */ usize = s2u(size); malloc_mutex_lock(&arena->lock); if (config_cache_oblivious) { uint64_t r; /* * Compute a uniformly distributed offset within the first page * that is a multiple of the cacheline size, e.g. [0 .. 63) * 64 * for 4 KiB pages and 64-byte cachelines. */ prng64(r, LG_PAGE - LG_CACHELINE, arena->offset_state, UINT64_C(6364136223846793009), UINT64_C(1442695040888963409)); random_offset = ((uintptr_t)r) << LG_CACHELINE; } else random_offset = 0; run = arena_run_alloc_large(arena, usize + large_pad, zero); if (run == NULL) { malloc_mutex_unlock(&arena->lock); return (NULL); } miscelm = arena_run_to_miscelm(run); ret = (void *)((uintptr_t)arena_miscelm_to_rpages(miscelm) + random_offset); if (config_stats) { szind_t index = size2index(usize) - NBINS; arena->stats.nmalloc_large++; arena->stats.nrequests_large++; arena->stats.allocated_large += usize; arena->stats.lstats[index].nmalloc++; arena->stats.lstats[index].nrequests++; arena->stats.lstats[index].curruns++; } if (config_prof) idump = arena_prof_accum_locked(arena, usize); malloc_mutex_unlock(&arena->lock); if (config_prof && idump) prof_idump(); if (!zero) { if (config_fill) { if (unlikely(opt_junk_alloc)) memset(ret, 0xa5, usize); else if (unlikely(opt_zero)) memset(ret, 0, usize); } } return (ret); } /* Only handles large allocations that require more than page alignment. */ static void * arena_palloc_large(tsd_t *tsd, arena_t *arena, size_t usize, size_t alignment, bool zero) { void *ret; size_t alloc_size, leadsize, trailsize; arena_run_t *run; arena_chunk_t *chunk; arena_chunk_map_misc_t *miscelm; void *rpages; assert(usize == PAGE_CEILING(usize)); arena = arena_choose(tsd, arena); if (unlikely(arena == NULL)) return (NULL); alignment = PAGE_CEILING(alignment); alloc_size = usize + large_pad + alignment - PAGE; malloc_mutex_lock(&arena->lock); run = arena_run_alloc_large(arena, alloc_size, false); if (run == NULL) { malloc_mutex_unlock(&arena->lock); return (NULL); } chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(run); miscelm = arena_run_to_miscelm(run); rpages = arena_miscelm_to_rpages(miscelm); leadsize = ALIGNMENT_CEILING((uintptr_t)rpages, alignment) - (uintptr_t)rpages; assert(alloc_size >= leadsize + usize); trailsize = alloc_size - leadsize - usize - large_pad; if (leadsize != 0) { arena_chunk_map_misc_t *head_miscelm = miscelm; arena_run_t *head_run = run; miscelm = arena_miscelm_get(chunk, arena_miscelm_to_pageind(head_miscelm) + (leadsize >> LG_PAGE)); run = &miscelm->run; arena_run_trim_head(arena, chunk, head_run, alloc_size, alloc_size - leadsize); } if (trailsize != 0) { arena_run_trim_tail(arena, chunk, run, usize + large_pad + trailsize, usize + large_pad, false); } if (arena_run_init_large(arena, run, usize + large_pad, zero)) { size_t run_ind = arena_miscelm_to_pageind(arena_run_to_miscelm(run)); bool dirty = (arena_mapbits_dirty_get(chunk, run_ind) != 0); bool decommitted = (arena_mapbits_decommitted_get(chunk, run_ind) != 0); assert(decommitted); /* Cause of OOM. */ arena_run_dalloc(arena, run, dirty, false, decommitted); malloc_mutex_unlock(&arena->lock); return (NULL); } ret = arena_miscelm_to_rpages(miscelm); if (config_stats) { szind_t index = size2index(usize) - NBINS; arena->stats.nmalloc_large++; arena->stats.nrequests_large++; arena->stats.allocated_large += usize; arena->stats.lstats[index].nmalloc++; arena->stats.lstats[index].nrequests++; arena->stats.lstats[index].curruns++; } malloc_mutex_unlock(&arena->lock); if (config_fill && !zero) { if (unlikely(opt_junk_alloc)) memset(ret, 0xa5, usize); else if (unlikely(opt_zero)) memset(ret, 0, usize); } return (ret); } void * arena_palloc(tsd_t *tsd, arena_t *arena, size_t usize, size_t alignment, bool zero, tcache_t *tcache) { void *ret; if (usize <= SMALL_MAXCLASS && (alignment < PAGE || (alignment == PAGE && (usize & PAGE_MASK) == 0))) { /* Small; alignment doesn't require special run placement. */ ret = arena_malloc(tsd, arena, usize, zero, tcache); } else if (usize <= large_maxclass && alignment <= PAGE) { /* * Large; alignment doesn't require special run placement. * However, the cached pointer may be at a random offset from * the base of the run, so do some bit manipulation to retrieve * the base. */ ret = arena_malloc(tsd, arena, usize, zero, tcache); if (config_cache_oblivious) ret = (void *)((uintptr_t)ret & ~PAGE_MASK); } else { if (likely(usize <= large_maxclass)) { ret = arena_palloc_large(tsd, arena, usize, alignment, zero); } else if (likely(alignment <= chunksize)) ret = huge_malloc(tsd, arena, usize, zero, tcache); else { ret = huge_palloc(tsd, arena, usize, alignment, zero, tcache); } } return (ret); } void arena_prof_promoted(const void *ptr, size_t size) { arena_chunk_t *chunk; size_t pageind; szind_t binind; cassert(config_prof); assert(ptr != NULL); assert(CHUNK_ADDR2BASE(ptr) != ptr); assert(isalloc(ptr, false) == LARGE_MINCLASS); assert(isalloc(ptr, true) == LARGE_MINCLASS); assert(size <= SMALL_MAXCLASS); chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; binind = size2index(size); assert(binind < NBINS); arena_mapbits_large_binind_set(chunk, pageind, binind); assert(isalloc(ptr, false) == LARGE_MINCLASS); assert(isalloc(ptr, true) == size); } static void arena_dissociate_bin_run(arena_chunk_t *chunk, arena_run_t *run, arena_bin_t *bin) { /* Dissociate run from bin. */ if (run == bin->runcur) bin->runcur = NULL; else { szind_t binind = arena_bin_index(extent_node_arena_get( &chunk->node), bin); arena_bin_info_t *bin_info = &arena_bin_info[binind]; if (bin_info->nregs != 1) { /* * This block's conditional is necessary because if the * run only contains one region, then it never gets * inserted into the non-full runs tree. */ arena_bin_runs_remove(bin, run); } } } static void arena_dalloc_bin_run(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, arena_bin_t *bin) { assert(run != bin->runcur); assert(arena_run_tree_search(&bin->runs, arena_run_to_miscelm(run)) == NULL); malloc_mutex_unlock(&bin->lock); /******************************/ malloc_mutex_lock(&arena->lock); arena_run_dalloc_decommit(arena, chunk, run); malloc_mutex_unlock(&arena->lock); /****************************/ malloc_mutex_lock(&bin->lock); if (config_stats) bin->stats.curruns--; } static void arena_bin_lower_run(arena_t *arena, arena_chunk_t *chunk, arena_run_t *run, arena_bin_t *bin) { /* * Make sure that if bin->runcur is non-NULL, it refers to the lowest * non-full run. It is okay to NULL runcur out rather than proactively * keeping it pointing at the lowest non-full run. */ if ((uintptr_t)run < (uintptr_t)bin->runcur) { /* Switch runcur. */ if (bin->runcur->nfree > 0) arena_bin_runs_insert(bin, bin->runcur); bin->runcur = run; if (config_stats) bin->stats.reruns++; } else arena_bin_runs_insert(bin, run); } static void arena_dalloc_bin_locked_impl(arena_t *arena, arena_chunk_t *chunk, void *ptr, arena_chunk_map_bits_t *bitselm, bool junked) { size_t pageind, rpages_ind; arena_run_t *run; arena_bin_t *bin; arena_bin_info_t *bin_info; szind_t binind; pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; rpages_ind = pageind - arena_mapbits_small_runind_get(chunk, pageind); run = &arena_miscelm_get(chunk, rpages_ind)->run; binind = run->binind; bin = &arena->bins[binind]; bin_info = &arena_bin_info[binind]; if (!junked && config_fill && unlikely(opt_junk_free)) arena_dalloc_junk_small(ptr, bin_info); arena_run_reg_dalloc(run, ptr); if (run->nfree == bin_info->nregs) { arena_dissociate_bin_run(chunk, run, bin); arena_dalloc_bin_run(arena, chunk, run, bin); } else if (run->nfree == 1 && run != bin->runcur) arena_bin_lower_run(arena, chunk, run, bin); if (config_stats) { bin->stats.ndalloc++; bin->stats.curregs--; } } void arena_dalloc_bin_junked_locked(arena_t *arena, arena_chunk_t *chunk, void *ptr, arena_chunk_map_bits_t *bitselm) { arena_dalloc_bin_locked_impl(arena, chunk, ptr, bitselm, true); } void arena_dalloc_bin(arena_t *arena, arena_chunk_t *chunk, void *ptr, size_t pageind, arena_chunk_map_bits_t *bitselm) { arena_run_t *run; arena_bin_t *bin; size_t rpages_ind; rpages_ind = pageind - arena_mapbits_small_runind_get(chunk, pageind); run = &arena_miscelm_get(chunk, rpages_ind)->run; bin = &arena->bins[run->binind]; malloc_mutex_lock(&bin->lock); arena_dalloc_bin_locked_impl(arena, chunk, ptr, bitselm, false); malloc_mutex_unlock(&bin->lock); } void arena_dalloc_small(arena_t *arena, arena_chunk_t *chunk, void *ptr, size_t pageind) { arena_chunk_map_bits_t *bitselm; if (config_debug) { /* arena_ptr_small_binind_get() does extra sanity checking. */ assert(arena_ptr_small_binind_get(ptr, arena_mapbits_get(chunk, pageind)) != BININD_INVALID); } bitselm = arena_bitselm_get(chunk, pageind); arena_dalloc_bin(arena, chunk, ptr, pageind, bitselm); } #ifdef JEMALLOC_JET #undef arena_dalloc_junk_large #define arena_dalloc_junk_large JEMALLOC_N(arena_dalloc_junk_large_impl) #endif void arena_dalloc_junk_large(void *ptr, size_t usize) { if (config_fill && unlikely(opt_junk_free)) memset(ptr, 0x5a, usize); } #ifdef JEMALLOC_JET #undef arena_dalloc_junk_large #define arena_dalloc_junk_large JEMALLOC_N(arena_dalloc_junk_large) arena_dalloc_junk_large_t *arena_dalloc_junk_large = JEMALLOC_N(arena_dalloc_junk_large_impl); #endif void arena_dalloc_large_locked_impl(arena_t *arena, arena_chunk_t *chunk, void *ptr, bool junked) { size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; arena_chunk_map_misc_t *miscelm = arena_miscelm_get(chunk, pageind); arena_run_t *run = &miscelm->run; if (config_fill || config_stats) { size_t usize = arena_mapbits_large_size_get(chunk, pageind) - large_pad; if (!junked) arena_dalloc_junk_large(ptr, usize); if (config_stats) { szind_t index = size2index(usize) - NBINS; arena->stats.ndalloc_large++; arena->stats.allocated_large -= usize; arena->stats.lstats[index].ndalloc++; arena->stats.lstats[index].curruns--; } } arena_run_dalloc_decommit(arena, chunk, run); } void arena_dalloc_large_junked_locked(arena_t *arena, arena_chunk_t *chunk, void *ptr) { arena_dalloc_large_locked_impl(arena, chunk, ptr, true); } void arena_dalloc_large(arena_t *arena, arena_chunk_t *chunk, void *ptr) { malloc_mutex_lock(&arena->lock); arena_dalloc_large_locked_impl(arena, chunk, ptr, false); malloc_mutex_unlock(&arena->lock); } static void arena_ralloc_large_shrink(arena_t *arena, arena_chunk_t *chunk, void *ptr, size_t oldsize, size_t size) { size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; arena_chunk_map_misc_t *miscelm = arena_miscelm_get(chunk, pageind); arena_run_t *run = &miscelm->run; assert(size < oldsize); /* * Shrink the run, and make trailing pages available for other * allocations. */ malloc_mutex_lock(&arena->lock); arena_run_trim_tail(arena, chunk, run, oldsize + large_pad, size + large_pad, true); if (config_stats) { szind_t oldindex = size2index(oldsize) - NBINS; szind_t index = size2index(size) - NBINS; arena->stats.ndalloc_large++; arena->stats.allocated_large -= oldsize; arena->stats.lstats[oldindex].ndalloc++; arena->stats.lstats[oldindex].curruns--; arena->stats.nmalloc_large++; arena->stats.nrequests_large++; arena->stats.allocated_large += size; arena->stats.lstats[index].nmalloc++; arena->stats.lstats[index].nrequests++; arena->stats.lstats[index].curruns++; } malloc_mutex_unlock(&arena->lock); } static bool arena_ralloc_large_grow(arena_t *arena, arena_chunk_t *chunk, void *ptr, size_t oldsize, size_t usize_min, size_t usize_max, bool zero) { size_t pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; size_t npages = (oldsize + large_pad) >> LG_PAGE; size_t followsize; assert(oldsize == arena_mapbits_large_size_get(chunk, pageind) - large_pad); /* Try to extend the run. */ malloc_mutex_lock(&arena->lock); if (pageind+npages >= chunk_npages || arena_mapbits_allocated_get(chunk, pageind+npages) != 0) goto label_fail; followsize = arena_mapbits_unallocated_size_get(chunk, pageind+npages); if (oldsize + followsize >= usize_min) { /* * The next run is available and sufficiently large. Split the * following run, then merge the first part with the existing * allocation. */ arena_run_t *run; size_t usize, splitsize, size, flag_dirty, flag_unzeroed_mask; usize = usize_max; while (oldsize + followsize < usize) usize = index2size(size2index(usize)-1); assert(usize >= usize_min); assert(usize >= oldsize); splitsize = usize - oldsize; if (splitsize == 0) goto label_fail; run = &arena_miscelm_get(chunk, pageind+npages)->run; if (arena_run_split_large(arena, run, splitsize, zero)) goto label_fail; size = oldsize + splitsize; npages = (size + large_pad) >> LG_PAGE; /* * Mark the extended run as dirty if either portion of the run * was dirty before allocation. This is rather pedantic, * because there's not actually any sequence of events that * could cause the resulting run to be passed to * arena_run_dalloc() with the dirty argument set to false * (which is when dirty flag consistency would really matter). */ flag_dirty = arena_mapbits_dirty_get(chunk, pageind) | arena_mapbits_dirty_get(chunk, pageind+npages-1); flag_unzeroed_mask = flag_dirty == 0 ? CHUNK_MAP_UNZEROED : 0; arena_mapbits_large_set(chunk, pageind, size + large_pad, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind))); arena_mapbits_large_set(chunk, pageind+npages-1, 0, flag_dirty | (flag_unzeroed_mask & arena_mapbits_unzeroed_get(chunk, pageind+npages-1))); if (config_stats) { szind_t oldindex = size2index(oldsize) - NBINS; szind_t index = size2index(size) - NBINS; arena->stats.ndalloc_large++; arena->stats.allocated_large -= oldsize; arena->stats.lstats[oldindex].ndalloc++; arena->stats.lstats[oldindex].curruns--; arena->stats.nmalloc_large++; arena->stats.nrequests_large++; arena->stats.allocated_large += size; arena->stats.lstats[index].nmalloc++; arena->stats.lstats[index].nrequests++; arena->stats.lstats[index].curruns++; } malloc_mutex_unlock(&arena->lock); return (false); } label_fail: malloc_mutex_unlock(&arena->lock); return (true); } #ifdef JEMALLOC_JET #undef arena_ralloc_junk_large #define arena_ralloc_junk_large JEMALLOC_N(arena_ralloc_junk_large_impl) #endif static void arena_ralloc_junk_large(void *ptr, size_t old_usize, size_t usize) { if (config_fill && unlikely(opt_junk_free)) { memset((void *)((uintptr_t)ptr + usize), 0x5a, old_usize - usize); } } #ifdef JEMALLOC_JET #undef arena_ralloc_junk_large #define arena_ralloc_junk_large JEMALLOC_N(arena_ralloc_junk_large) arena_ralloc_junk_large_t *arena_ralloc_junk_large = JEMALLOC_N(arena_ralloc_junk_large_impl); #endif /* * Try to resize a large allocation, in order to avoid copying. This will * always fail if growing an object, and the following run is already in use. */ static bool arena_ralloc_large(void *ptr, size_t oldsize, size_t usize_min, size_t usize_max, bool zero) { arena_chunk_t *chunk; arena_t *arena; if (oldsize == usize_max) { /* Current size class is compatible and maximal. */ return (false); } chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); arena = extent_node_arena_get(&chunk->node); if (oldsize < usize_max) { bool ret = arena_ralloc_large_grow(arena, chunk, ptr, oldsize, usize_min, usize_max, zero); if (config_fill && !ret && !zero) { if (unlikely(opt_junk_alloc)) { memset((void *)((uintptr_t)ptr + oldsize), 0xa5, isalloc(ptr, config_prof) - oldsize); } else if (unlikely(opt_zero)) { memset((void *)((uintptr_t)ptr + oldsize), 0, isalloc(ptr, config_prof) - oldsize); } } return (ret); } assert(oldsize > usize_max); /* Fill before shrinking in order avoid a race. */ arena_ralloc_junk_large(ptr, oldsize, usize_max); arena_ralloc_large_shrink(arena, chunk, ptr, oldsize, usize_max); return (false); } bool arena_ralloc_no_move(void *ptr, size_t oldsize, size_t size, size_t extra, bool zero) { size_t usize_min, usize_max; usize_min = s2u(size); usize_max = s2u(size + extra); if (likely(oldsize <= large_maxclass && usize_min <= large_maxclass)) { /* * Avoid moving the allocation if the size class can be left the * same. */ if (oldsize <= SMALL_MAXCLASS) { assert(arena_bin_info[size2index(oldsize)].reg_size == oldsize); if ((usize_max <= SMALL_MAXCLASS && size2index(usize_max) == size2index(oldsize)) || (size <= oldsize && usize_max >= oldsize)) return (false); } else { if (usize_max > SMALL_MAXCLASS) { if (!arena_ralloc_large(ptr, oldsize, usize_min, usize_max, zero)) return (false); } } /* Reallocation would require a move. */ return (true); } else { return (huge_ralloc_no_move(ptr, oldsize, usize_min, usize_max, zero)); } } static void * arena_ralloc_move_helper(tsd_t *tsd, arena_t *arena, size_t usize, size_t alignment, bool zero, tcache_t *tcache) { if (alignment == 0) return (arena_malloc(tsd, arena, usize, zero, tcache)); usize = sa2u(usize, alignment); if (usize == 0) return (NULL); return (ipalloct(tsd, usize, alignment, zero, tcache, arena)); } void * arena_ralloc(tsd_t *tsd, arena_t *arena, void *ptr, size_t oldsize, size_t size, size_t alignment, bool zero, tcache_t *tcache) { void *ret; size_t usize; usize = s2u(size); if (usize == 0) return (NULL); if (likely(usize <= large_maxclass)) { size_t copysize; /* Try to avoid moving the allocation. */ if (!arena_ralloc_no_move(ptr, oldsize, usize, 0, zero)) return (ptr); /* * size and oldsize are different enough that we need to move * the object. In that case, fall back to allocating new space * and copying. */ ret = arena_ralloc_move_helper(tsd, arena, usize, alignment, zero, tcache); if (ret == NULL) return (NULL); /* * Junk/zero-filling were already done by * ipalloc()/arena_malloc(). */ copysize = (usize < oldsize) ? usize : oldsize; JEMALLOC_VALGRIND_MAKE_MEM_UNDEFINED(ret, copysize); memcpy(ret, ptr, copysize); isqalloc(tsd, ptr, oldsize, tcache); } else { ret = huge_ralloc(tsd, arena, ptr, oldsize, usize, alignment, zero, tcache); } return (ret); } dss_prec_t arena_dss_prec_get(arena_t *arena) { dss_prec_t ret; malloc_mutex_lock(&arena->lock); ret = arena->dss_prec; malloc_mutex_unlock(&arena->lock); return (ret); } bool arena_dss_prec_set(arena_t *arena, dss_prec_t dss_prec) { if (!have_dss) return (dss_prec != dss_prec_disabled); malloc_mutex_lock(&arena->lock); arena->dss_prec = dss_prec; malloc_mutex_unlock(&arena->lock); return (false); } ssize_t arena_lg_dirty_mult_default_get(void) { return ((ssize_t)atomic_read_z((size_t *)&lg_dirty_mult_default)); } bool arena_lg_dirty_mult_default_set(ssize_t lg_dirty_mult) { if (!arena_lg_dirty_mult_valid(lg_dirty_mult)) return (true); atomic_write_z((size_t *)&lg_dirty_mult_default, (size_t)lg_dirty_mult); return (false); } void arena_stats_merge(arena_t *arena, const char **dss, ssize_t *lg_dirty_mult, size_t *nactive, size_t *ndirty, arena_stats_t *astats, malloc_bin_stats_t *bstats, malloc_large_stats_t *lstats, malloc_huge_stats_t *hstats) { unsigned i; malloc_mutex_lock(&arena->lock); *dss = dss_prec_names[arena->dss_prec]; *lg_dirty_mult = arena->lg_dirty_mult; *nactive += arena->nactive; *ndirty += arena->ndirty; astats->mapped += arena->stats.mapped; astats->npurge += arena->stats.npurge; astats->nmadvise += arena->stats.nmadvise; astats->purged += arena->stats.purged; astats->metadata_mapped += arena->stats.metadata_mapped; astats->metadata_allocated += arena_metadata_allocated_get(arena); astats->allocated_large += arena->stats.allocated_large; astats->nmalloc_large += arena->stats.nmalloc_large; astats->ndalloc_large += arena->stats.ndalloc_large; astats->nrequests_large += arena->stats.nrequests_large; astats->allocated_huge += arena->stats.allocated_huge; astats->nmalloc_huge += arena->stats.nmalloc_huge; astats->ndalloc_huge += arena->stats.ndalloc_huge; for (i = 0; i < nlclasses; i++) { lstats[i].nmalloc += arena->stats.lstats[i].nmalloc; lstats[i].ndalloc += arena->stats.lstats[i].ndalloc; lstats[i].nrequests += arena->stats.lstats[i].nrequests; lstats[i].curruns += arena->stats.lstats[i].curruns; } for (i = 0; i < nhclasses; i++) { hstats[i].nmalloc += arena->stats.hstats[i].nmalloc; hstats[i].ndalloc += arena->stats.hstats[i].ndalloc; hstats[i].curhchunks += arena->stats.hstats[i].curhchunks; } malloc_mutex_unlock(&arena->lock); for (i = 0; i < NBINS; i++) { arena_bin_t *bin = &arena->bins[i]; malloc_mutex_lock(&bin->lock); bstats[i].nmalloc += bin->stats.nmalloc; bstats[i].ndalloc += bin->stats.ndalloc; bstats[i].nrequests += bin->stats.nrequests; bstats[i].curregs += bin->stats.curregs; if (config_tcache) { bstats[i].nfills += bin->stats.nfills; bstats[i].nflushes += bin->stats.nflushes; } bstats[i].nruns += bin->stats.nruns; bstats[i].reruns += bin->stats.reruns; bstats[i].curruns += bin->stats.curruns; malloc_mutex_unlock(&bin->lock); } } arena_t * arena_new(unsigned ind) { arena_t *arena; unsigned i; arena_bin_t *bin; /* * Allocate arena, arena->lstats, and arena->hstats contiguously, mainly * because there is no way to clean up if base_alloc() OOMs. */ if (config_stats) { arena = (arena_t *)base_alloc(CACHELINE_CEILING(sizeof(arena_t)) + QUANTUM_CEILING(nlclasses * sizeof(malloc_large_stats_t) + nhclasses) * sizeof(malloc_huge_stats_t)); } else arena = (arena_t *)base_alloc(sizeof(arena_t)); if (arena == NULL) return (NULL); arena->ind = ind; arena->nthreads = 0; if (malloc_mutex_init(&arena->lock)) return (NULL); if (config_stats) { memset(&arena->stats, 0, sizeof(arena_stats_t)); arena->stats.lstats = (malloc_large_stats_t *)((uintptr_t)arena + CACHELINE_CEILING(sizeof(arena_t))); memset(arena->stats.lstats, 0, nlclasses * sizeof(malloc_large_stats_t)); arena->stats.hstats = (malloc_huge_stats_t *)((uintptr_t)arena + CACHELINE_CEILING(sizeof(arena_t)) + QUANTUM_CEILING(nlclasses * sizeof(malloc_large_stats_t))); memset(arena->stats.hstats, 0, nhclasses * sizeof(malloc_huge_stats_t)); if (config_tcache) ql_new(&arena->tcache_ql); } if (config_prof) arena->prof_accumbytes = 0; if (config_cache_oblivious) { /* * A nondeterministic seed based on the address of arena reduces * the likelihood of lockstep non-uniform cache index * utilization among identical concurrent processes, but at the * cost of test repeatability. For debug builds, instead use a * deterministic seed. */ arena->offset_state = config_debug ? ind : (uint64_t)(uintptr_t)arena; } arena->dss_prec = chunk_dss_prec_get(); arena->spare = NULL; arena->lg_dirty_mult = arena_lg_dirty_mult_default_get(); arena->purging = false; arena->nactive = 0; arena->ndirty = 0; arena_avail_tree_new(&arena->runs_avail); qr_new(&arena->runs_dirty, rd_link); qr_new(&arena->chunks_cache, cc_link); ql_new(&arena->huge); if (malloc_mutex_init(&arena->huge_mtx)) return (NULL); extent_tree_szad_new(&arena->chunks_szad_cached); extent_tree_ad_new(&arena->chunks_ad_cached); extent_tree_szad_new(&arena->chunks_szad_retained); extent_tree_ad_new(&arena->chunks_ad_retained); if (malloc_mutex_init(&arena->chunks_mtx)) return (NULL); ql_new(&arena->node_cache); if (malloc_mutex_init(&arena->node_cache_mtx)) return (NULL); arena->chunk_hooks = chunk_hooks_default; /* Initialize bins. */ for (i = 0; i < NBINS; i++) { bin = &arena->bins[i]; if (malloc_mutex_init(&bin->lock)) return (NULL); bin->runcur = NULL; arena_run_tree_new(&bin->runs); if (config_stats) memset(&bin->stats, 0, sizeof(malloc_bin_stats_t)); } return (arena); } /* * Calculate bin_info->run_size such that it meets the following constraints: * * *) bin_info->run_size <= arena_maxrun * *) bin_info->nregs <= RUN_MAXREGS * * bin_info->nregs and bin_info->reg0_offset are also calculated here, since * these settings are all interdependent. */ static void bin_info_run_size_calc(arena_bin_info_t *bin_info) { size_t pad_size; size_t try_run_size, perfect_run_size, actual_run_size; uint32_t try_nregs, perfect_nregs, actual_nregs; /* * Determine redzone size based on minimum alignment and minimum * redzone size. Add padding to the end of the run if it is needed to * align the regions. The padding allows each redzone to be half the * minimum alignment; without the padding, each redzone would have to * be twice as large in order to maintain alignment. */ if (config_fill && unlikely(opt_redzone)) { size_t align_min = ZU(1) << (jemalloc_ffs(bin_info->reg_size) - 1); if (align_min <= REDZONE_MINSIZE) { bin_info->redzone_size = REDZONE_MINSIZE; pad_size = 0; } else { bin_info->redzone_size = align_min >> 1; pad_size = bin_info->redzone_size; } } else { bin_info->redzone_size = 0; pad_size = 0; } bin_info->reg_interval = bin_info->reg_size + (bin_info->redzone_size << 1); /* * Compute run size under ideal conditions (no redzones, no limit on run * size). */ try_run_size = PAGE; try_nregs = try_run_size / bin_info->reg_size; do { perfect_run_size = try_run_size; perfect_nregs = try_nregs; try_run_size += PAGE; try_nregs = try_run_size / bin_info->reg_size; } while (perfect_run_size != perfect_nregs * bin_info->reg_size); assert(perfect_nregs <= RUN_MAXREGS); actual_run_size = perfect_run_size; actual_nregs = (actual_run_size - pad_size) / bin_info->reg_interval; /* * Redzones can require enough padding that not even a single region can * fit within the number of pages that would normally be dedicated to a * run for this size class. Increase the run size until at least one * region fits. */ while (actual_nregs == 0) { assert(config_fill && unlikely(opt_redzone)); actual_run_size += PAGE; actual_nregs = (actual_run_size - pad_size) / bin_info->reg_interval; } /* * Make sure that the run will fit within an arena chunk. */ while (actual_run_size > arena_maxrun) { actual_run_size -= PAGE; actual_nregs = (actual_run_size - pad_size) / bin_info->reg_interval; } assert(actual_nregs > 0); assert(actual_run_size == s2u(actual_run_size)); /* Copy final settings. */ bin_info->run_size = actual_run_size; bin_info->nregs = actual_nregs; bin_info->reg0_offset = actual_run_size - (actual_nregs * bin_info->reg_interval) - pad_size + bin_info->redzone_size; if (actual_run_size > small_maxrun) small_maxrun = actual_run_size; assert(bin_info->reg0_offset - bin_info->redzone_size + (bin_info->nregs * bin_info->reg_interval) + pad_size == bin_info->run_size); } static void bin_info_init(void) { arena_bin_info_t *bin_info; #define BIN_INFO_INIT_bin_yes(index, size) \ bin_info = &arena_bin_info[index]; \ bin_info->reg_size = size; \ bin_info_run_size_calc(bin_info); \ bitmap_info_init(&bin_info->bitmap_info, bin_info->nregs); #define BIN_INFO_INIT_bin_no(index, size) #define SC(index, lg_grp, lg_delta, ndelta, bin, lg_delta_lookup) \ BIN_INFO_INIT_bin_##bin(index, (ZU(1)<> LG_PAGE)); if (small_run_tab == NULL) return (true); #define TAB_INIT_bin_yes(index, size) { \ arena_bin_info_t *bin_info = &arena_bin_info[index]; \ small_run_tab[bin_info->run_size >> LG_PAGE] = true; \ } #define TAB_INIT_bin_no(index, size) #define SC(index, lg_grp, lg_delta, ndelta, bin, lg_delta_lookup) \ TAB_INIT_bin_##bin(index, (ZU(1)<= the result * from (2), and will always be correct. */ map_bias = 0; for (i = 0; i < 3; i++) { size_t header_size = offsetof(arena_chunk_t, map_bits) + ((sizeof(arena_chunk_map_bits_t) + sizeof(arena_chunk_map_misc_t)) * (chunk_npages-map_bias)); map_bias = (header_size + PAGE_MASK) >> LG_PAGE; } assert(map_bias > 0); map_misc_offset = offsetof(arena_chunk_t, map_bits) + sizeof(arena_chunk_map_bits_t) * (chunk_npages-map_bias); arena_maxrun = chunksize - (map_bias << LG_PAGE); assert(arena_maxrun > 0); large_maxclass = index2size(size2index(chunksize)-1); if (large_maxclass > arena_maxrun) { /* * For small chunk sizes it's possible for there to be fewer * non-header pages available than are necessary to serve the * size classes just below chunksize. */ large_maxclass = arena_maxrun; } assert(large_maxclass > 0); nlclasses = size2index(large_maxclass) - size2index(SMALL_MAXCLASS); nhclasses = NSIZES - nlclasses - NBINS; bin_info_init(); return (small_run_size_init()); } void arena_prefork(arena_t *arena) { unsigned i; malloc_mutex_prefork(&arena->lock); malloc_mutex_prefork(&arena->huge_mtx); malloc_mutex_prefork(&arena->chunks_mtx); malloc_mutex_prefork(&arena->node_cache_mtx); for (i = 0; i < NBINS; i++) malloc_mutex_prefork(&arena->bins[i].lock); } void arena_postfork_parent(arena_t *arena) { unsigned i; for (i = 0; i < NBINS; i++) malloc_mutex_postfork_parent(&arena->bins[i].lock); malloc_mutex_postfork_parent(&arena->node_cache_mtx); malloc_mutex_postfork_parent(&arena->chunks_mtx); malloc_mutex_postfork_parent(&arena->huge_mtx); malloc_mutex_postfork_parent(&arena->lock); } void arena_postfork_child(arena_t *arena) { unsigned i; for (i = 0; i < NBINS; i++) malloc_mutex_postfork_child(&arena->bins[i].lock); malloc_mutex_postfork_child(&arena->node_cache_mtx); malloc_mutex_postfork_child(&arena->chunks_mtx); malloc_mutex_postfork_child(&arena->huge_mtx); malloc_mutex_postfork_child(&arena->lock); }