341 lines
9.6 KiB
C
341 lines
9.6 KiB
C
#define JEMALLOC_LARGE_C_
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#include "jemalloc/internal/jemalloc_internal.h"
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/******************************************************************************/
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void *
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large_malloc(tsdn_t *tsdn, arena_t *arena, size_t usize, bool zero) {
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assert(usize == s2u(usize));
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return large_palloc(tsdn, arena, usize, CACHELINE, zero);
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}
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void *
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large_palloc(tsdn_t *tsdn, arena_t *arena, size_t usize, size_t alignment,
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bool zero) {
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size_t ausize;
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extent_t *extent;
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bool is_zeroed;
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UNUSED bool idump JEMALLOC_CC_SILENCE_INIT(false);
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assert(!tsdn_null(tsdn) || arena != NULL);
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ausize = sa2u(usize, alignment);
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if (unlikely(ausize == 0 || ausize > LARGE_MAXCLASS)) {
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return NULL;
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}
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/*
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* Copy zero into is_zeroed and pass the copy to extent_alloc(), so that
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* it is possible to make correct junk/zero fill decisions below.
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*/
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is_zeroed = zero;
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if (likely(!tsdn_null(tsdn))) {
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arena = arena_choose(tsdn_tsd(tsdn), arena);
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}
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if (unlikely(arena == NULL) || (extent = arena_extent_alloc_large(tsdn,
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arena, usize, alignment, &is_zeroed)) == NULL) {
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return NULL;
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}
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/* Insert extent into large. */
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malloc_mutex_lock(tsdn, &arena->large_mtx);
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ql_elm_new(extent, ql_link);
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ql_tail_insert(&arena->large, extent, ql_link);
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malloc_mutex_unlock(tsdn, &arena->large_mtx);
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if (config_prof && arena_prof_accum(tsdn, arena, usize)) {
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prof_idump(tsdn);
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}
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if (zero || (config_fill && unlikely(opt_zero))) {
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if (!is_zeroed) {
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memset(extent_addr_get(extent), 0,
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extent_usize_get(extent));
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}
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} else if (config_fill && unlikely(opt_junk_alloc)) {
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memset(extent_addr_get(extent), JEMALLOC_ALLOC_JUNK,
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extent_usize_get(extent));
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}
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arena_decay_tick(tsdn, arena);
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return extent_addr_get(extent);
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}
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#ifdef JEMALLOC_JET
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#undef large_dalloc_junk
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#define large_dalloc_junk JEMALLOC_N(n_large_dalloc_junk)
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#endif
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void
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large_dalloc_junk(void *ptr, size_t usize) {
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memset(ptr, JEMALLOC_FREE_JUNK, usize);
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}
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#ifdef JEMALLOC_JET
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#undef large_dalloc_junk
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#define large_dalloc_junk JEMALLOC_N(large_dalloc_junk)
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large_dalloc_junk_t *large_dalloc_junk = JEMALLOC_N(n_large_dalloc_junk);
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#endif
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#ifdef JEMALLOC_JET
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#undef large_dalloc_maybe_junk
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#define large_dalloc_maybe_junk JEMALLOC_N(n_large_dalloc_maybe_junk)
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#endif
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void
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large_dalloc_maybe_junk(void *ptr, size_t usize) {
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if (config_fill && have_dss && unlikely(opt_junk_free)) {
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/*
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* Only bother junk filling if the extent isn't about to be
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* unmapped.
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*/
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if (!config_munmap || (have_dss && extent_in_dss(ptr))) {
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large_dalloc_junk(ptr, usize);
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}
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}
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}
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#ifdef JEMALLOC_JET
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#undef large_dalloc_maybe_junk
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#define large_dalloc_maybe_junk JEMALLOC_N(large_dalloc_maybe_junk)
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large_dalloc_maybe_junk_t *large_dalloc_maybe_junk =
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JEMALLOC_N(n_large_dalloc_maybe_junk);
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#endif
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static bool
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large_ralloc_no_move_shrink(tsdn_t *tsdn, extent_t *extent, size_t usize) {
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arena_t *arena = extent_arena_get(extent);
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size_t oldusize = extent_usize_get(extent);
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extent_hooks_t *extent_hooks = extent_hooks_get(arena);
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size_t diff = extent_size_get(extent) - (usize + large_pad);
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assert(oldusize > usize);
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if (extent_hooks->split == NULL) {
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return true;
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}
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/* Split excess pages. */
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if (diff != 0) {
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extent_t *trail = extent_split_wrapper(tsdn, arena,
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&extent_hooks, extent, usize + large_pad, usize, diff,
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diff);
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if (trail == NULL) {
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return true;
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}
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if (config_fill && unlikely(opt_junk_free)) {
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large_dalloc_maybe_junk(extent_addr_get(trail),
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extent_usize_get(trail));
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}
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arena_extent_cache_dalloc(tsdn, arena, &extent_hooks, trail);
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}
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arena_extent_ralloc_large_shrink(tsdn, arena, extent, oldusize);
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return false;
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}
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static bool
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large_ralloc_no_move_expand(tsdn_t *tsdn, extent_t *extent, size_t usize,
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bool zero) {
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arena_t *arena = extent_arena_get(extent);
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size_t oldusize = extent_usize_get(extent);
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bool is_zeroed_trail = false;
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extent_hooks_t *extent_hooks = extent_hooks_get(arena);
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size_t trailsize = usize - extent_usize_get(extent);
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extent_t *trail;
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if (extent_hooks->merge == NULL) {
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return true;
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}
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if ((trail = arena_extent_cache_alloc(tsdn, arena, &extent_hooks,
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extent_past_get(extent), trailsize, CACHELINE, &is_zeroed_trail)) ==
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NULL) {
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bool commit = true;
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if ((trail = extent_alloc_wrapper(tsdn, arena, &extent_hooks,
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extent_past_get(extent), trailsize, 0, CACHELINE,
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&is_zeroed_trail, &commit, false)) == NULL) {
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return true;
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}
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}
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if (extent_merge_wrapper(tsdn, arena, &extent_hooks, extent, trail)) {
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extent_dalloc_wrapper(tsdn, arena, &extent_hooks, trail);
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return true;
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}
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if (zero || (config_fill && unlikely(opt_zero))) {
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if (config_cache_oblivious) {
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/*
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* Zero the trailing bytes of the original allocation's
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* last page, since they are in an indeterminate state.
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* There will always be trailing bytes, because ptr's
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* offset from the beginning of the extent is a multiple
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* of CACHELINE in [0 .. PAGE).
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*/
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void *zbase = (void *)
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((uintptr_t)extent_addr_get(extent) + oldusize);
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void *zpast = PAGE_ADDR2BASE((void *)((uintptr_t)zbase +
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PAGE));
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size_t nzero = (uintptr_t)zpast - (uintptr_t)zbase;
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assert(nzero > 0);
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memset(zbase, 0, nzero);
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}
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if (!is_zeroed_trail) {
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memset((void *)((uintptr_t)extent_addr_get(extent) +
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oldusize), 0, usize - oldusize);
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}
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} else if (config_fill && unlikely(opt_junk_alloc)) {
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memset((void *)((uintptr_t)extent_addr_get(extent) + oldusize),
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JEMALLOC_ALLOC_JUNK, usize - oldusize);
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}
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arena_extent_ralloc_large_expand(tsdn, arena, extent, oldusize);
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return false;
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}
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bool
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large_ralloc_no_move(tsdn_t *tsdn, extent_t *extent, size_t usize_min,
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size_t usize_max, bool zero) {
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assert(s2u(extent_usize_get(extent)) == extent_usize_get(extent));
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/* The following should have been caught by callers. */
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assert(usize_min > 0 && usize_max <= LARGE_MAXCLASS);
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/* Both allocation sizes must be large to avoid a move. */
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assert(extent_usize_get(extent) >= LARGE_MINCLASS && usize_max >=
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LARGE_MINCLASS);
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if (usize_max > extent_usize_get(extent)) {
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/* Attempt to expand the allocation in-place. */
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if (!large_ralloc_no_move_expand(tsdn, extent, usize_max,
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zero)) {
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arena_decay_tick(tsdn, extent_arena_get(extent));
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return false;
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}
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/* Try again, this time with usize_min. */
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if (usize_min < usize_max && usize_min >
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extent_usize_get(extent) &&
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large_ralloc_no_move_expand(tsdn, extent, usize_min,
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zero)) {
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arena_decay_tick(tsdn, extent_arena_get(extent));
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return false;
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}
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}
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/*
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* Avoid moving the allocation if the existing extent size accommodates
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* the new size.
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*/
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if (extent_usize_get(extent) >= usize_min && extent_usize_get(extent) <=
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usize_max) {
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arena_decay_tick(tsdn, extent_arena_get(extent));
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return false;
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}
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/* Attempt to shrink the allocation in-place. */
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if (extent_usize_get(extent) > usize_max) {
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if (!large_ralloc_no_move_shrink(tsdn, extent, usize_max)) {
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arena_decay_tick(tsdn, extent_arena_get(extent));
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return false;
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}
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}
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return true;
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}
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static void *
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large_ralloc_move_helper(tsdn_t *tsdn, arena_t *arena, size_t usize,
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size_t alignment, bool zero) {
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if (alignment <= CACHELINE) {
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return large_malloc(tsdn, arena, usize, zero);
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}
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return large_palloc(tsdn, arena, usize, alignment, zero);
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}
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void *
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large_ralloc(tsdn_t *tsdn, arena_t *arena, extent_t *extent, size_t usize,
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size_t alignment, bool zero, tcache_t *tcache) {
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void *ret;
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size_t copysize;
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/* The following should have been caught by callers. */
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assert(usize > 0 && usize <= LARGE_MAXCLASS);
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/* Both allocation sizes must be large to avoid a move. */
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assert(extent_usize_get(extent) >= LARGE_MINCLASS && usize >=
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LARGE_MINCLASS);
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/* Try to avoid moving the allocation. */
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if (!large_ralloc_no_move(tsdn, extent, usize, usize, zero)) {
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return extent_addr_get(extent);
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}
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/*
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* usize and old size are different enough that we need to use a
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* different size class. In that case, fall back to allocating new
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* space and copying.
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*/
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ret = large_ralloc_move_helper(tsdn, arena, usize, alignment, zero);
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if (ret == NULL) {
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return NULL;
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}
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copysize = (usize < extent_usize_get(extent)) ? usize :
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extent_usize_get(extent);
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memcpy(ret, extent_addr_get(extent), copysize);
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isdalloct(tsdn, extent, extent_addr_get(extent),
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extent_usize_get(extent), tcache, true);
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return ret;
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}
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/*
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* junked_locked indicates whether the extent's data have been junk-filled, and
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* whether the arena's lock is currently held. The arena's large_mtx is
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* independent of these considerations.
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*/
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static void
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large_dalloc_impl(tsdn_t *tsdn, extent_t *extent, bool junked_locked) {
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arena_t *arena;
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arena = extent_arena_get(extent);
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malloc_mutex_lock(tsdn, &arena->large_mtx);
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ql_remove(&arena->large, extent, ql_link);
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malloc_mutex_unlock(tsdn, &arena->large_mtx);
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if (!junked_locked) {
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large_dalloc_maybe_junk(extent_addr_get(extent),
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extent_usize_get(extent));
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}
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arena_extent_dalloc_large(tsdn, arena, extent, junked_locked);
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if (!junked_locked) {
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arena_decay_tick(tsdn, arena);
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}
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}
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void
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large_dalloc_junked_locked(tsdn_t *tsdn, extent_t *extent) {
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large_dalloc_impl(tsdn, extent, true);
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}
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void
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large_dalloc(tsdn_t *tsdn, extent_t *extent) {
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large_dalloc_impl(tsdn, extent, false);
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}
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size_t
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large_salloc(tsdn_t *tsdn, const extent_t *extent) {
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return extent_usize_get(extent);
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}
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prof_tctx_t *
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large_prof_tctx_get(tsdn_t *tsdn, const extent_t *extent) {
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return extent_prof_tctx_get(extent);
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}
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void
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large_prof_tctx_set(tsdn_t *tsdn, extent_t *extent, prof_tctx_t *tctx) {
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extent_prof_tctx_set(extent, tctx);
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}
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void
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large_prof_tctx_reset(tsdn_t *tsdn, extent_t *extent) {
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large_prof_tctx_set(tsdn, extent, (prof_tctx_t *)(uintptr_t)1U);
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}
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