mirror of
https://github.com/microsoft/mimalloc.git
synced 2024-12-27 13:33:18 +08:00
keep commit_mask live in the cache for better reuse
This commit is contained in:
daan
parent
63a9f45ba6
commit
f7dc4847f2
@ -71,9 +71,9 @@ bool _mi_os_unreset(void* p, size_t size, bool* is_zero, mi_stats_t* stats)
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size_t _mi_os_good_alloc_size(size_t size);
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// arena.c
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void* _mi_arena_alloc_aligned(size_t size, size_t alignment, bool* commit, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld);
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void* _mi_arena_alloc(size_t size, bool* commit, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld);
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void _mi_arena_free(void* p, size_t size, size_t memid, bool is_committed, bool is_large, mi_os_tld_t* tld);
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void* _mi_arena_alloc_aligned(size_t size, size_t alignment, bool commit, mi_commit_mask_t* commit_mask, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld);
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void* _mi_arena_alloc(size_t size, bool commit, mi_commit_mask_t* commit_mask, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld);
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void _mi_arena_free(void* p, size_t size, size_t memid, mi_commit_mask_t commit_mask, bool is_large, mi_os_tld_t* tld);
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// "segment.c"
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@ -655,6 +655,8 @@ static inline void mi_block_set_next(const mi_page_t* page, mi_block_t* block, c
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// commit mask
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// -------------------------------------------------------------------
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#define MI_COMMIT_MASK_BITS (sizeof(mi_commit_mask_t)*8)
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static inline mi_commit_mask_t mi_commit_mask_empty(void) {
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return 0;
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}
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@ -664,9 +666,9 @@ static inline mi_commit_mask_t mi_commit_mask_full(void) {
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}
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static inline mi_commit_mask_t mi_commit_mask_create(uintptr_t bitidx, uintptr_t bitcount) {
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mi_assert_internal(bitidx < MI_INTPTR_BITS);
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mi_assert_internal((bitidx + bitcount) <= MI_INTPTR_BITS);
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if (bitcount == MI_INTPTR_BITS) {
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mi_assert_internal(bitidx < MI_COMMIT_MASK_BITS);
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mi_assert_internal((bitidx + bitcount) <= MI_COMMIT_MASK_BITS);
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if (bitcount == MI_COMMIT_MASK_BITS) {
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mi_assert_internal(bitidx==0);
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return mi_commit_mask_full();
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}
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@ -683,7 +685,7 @@ static inline bool mi_commit_mask_is_empty(mi_commit_mask_t mask) {
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}
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static inline bool mi_commit_mask_is_full(mi_commit_mask_t mask) {
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return (~mask == 0);
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return ((~mask) == 0);
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}
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static inline bool mi_commit_mask_all_set(mi_commit_mask_t commit, mi_commit_mask_t mask) {
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@ -694,18 +696,35 @@ static inline bool mi_commit_mask_any_set(mi_commit_mask_t commit, mi_commit_mas
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return ((commit & mask) != 0);
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}
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static mi_decl_nodiscard inline mi_commit_mask_t mi_commit_mask_intersect(mi_commit_mask_t commit, mi_commit_mask_t mask) {
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mi_decl_nodiscard static inline mi_commit_mask_t mi_commit_mask_intersect(mi_commit_mask_t commit, mi_commit_mask_t mask) {
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return (commit & mask);
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}
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static inline void mi_commit_mask_clear(mi_commit_mask_t* commit, mi_commit_mask_t mask) {
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*commit = *commit & ~mask;
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*commit = (*commit) & (~mask);
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}
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static inline void mi_commit_mask_set(mi_commit_mask_t* commit, mi_commit_mask_t mask) {
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*commit = *commit | mask;
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*commit = (*commit) | mask;
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}
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static inline size_t mi_commit_mask_committed_size(mi_commit_mask_t mask, size_t total) {
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if (mi_commit_mask_is_full(mask)) {
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return total;
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}
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else if (mi_commit_mask_is_empty(mask)) {
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return 0;
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}
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else {
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size_t count = 0;
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for (; mask != 0; mask >>= 1) { // todo: use popcount
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if ((mask&1)!=0) count++;
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}
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return (total/MI_COMMIT_MASK_BITS)*count;
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}
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}
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#define mi_commit_mask_foreach(mask,idx,count) \
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idx = 0; \
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while (mask != 0) { \
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109
src/arena.c
109
src/arena.c
@ -135,8 +135,8 @@ static bool mi_arena_alloc(mi_arena_t* arena, size_t blocks, mi_bitmap_index_t*
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typedef struct mi_cache_slot_s {
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void* p;
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size_t memid;
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mi_commit_mask_t commit_mask;
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_Atomic(mi_msecs_t) expire;
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bool is_committed; // TODO: use bit from p to reduce size?
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} mi_cache_slot_t;
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static mi_cache_slot_t cache[MI_CACHE_MAX]; // = 0
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@ -147,7 +147,10 @@ static mi_bitmap_field_t cache_available_large[MI_CACHE_FIELDS] = { MI_CACHE_BIT
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static mi_bitmap_field_t cache_inuse[MI_CACHE_FIELDS]; // zero bit = free
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static void* mi_cache_pop(int numa_node, size_t size, size_t alignment, bool* commit, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld) {
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static void* mi_cache_pop(int numa_node, size_t size, size_t alignment, bool commit, mi_commit_mask_t* commit_mask, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld) {
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UNUSED(tld);
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UNUSED(commit);
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// only segment blocks
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if (size != MI_SEGMENT_SIZE || alignment > MI_SEGMENT_ALIGN) return NULL;
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@ -177,24 +180,55 @@ static void* mi_cache_pop(int numa_node, size_t size, size_t alignment, bool* co
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void* p = slot->p;
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*memid = slot->memid;
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*is_zero = false;
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bool committed = slot->is_committed;
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mi_commit_mask_t cmask = slot->commit_mask; // copy
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slot->p = NULL;
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mi_atomic_storei64_release(&slot->expire,(mi_msecs_t)0);
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if (*commit && !committed) {
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// ignore commit request
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/*
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if (commit && !mi_commit_mask_is_full(cmask)) {
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bool commit_zero;
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_mi_os_commit(p, MI_SEGMENT_SIZE, &commit_zero, tld->stats);
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*commit = true;
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bool ok = _mi_os_commit(p, MI_SEGMENT_SIZE, &commit_zero, tld->stats); // todo: only commit needed parts?
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if (!ok) {
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*commit_mask = cmask;
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}
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else {
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*commit_mask = mi_commit_mask_full();
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}
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}
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else {
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*commit = committed;
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}
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*/
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*commit_mask = cmask;
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// mark the slot as free again
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mi_assert_internal(mi_bitmap_is_claimed(cache_inuse, MI_CACHE_FIELDS, 1, bitidx));
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mi_bitmap_unclaim(cache_inuse, MI_CACHE_FIELDS, 1, bitidx);
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return p;
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}
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static void mi_commit_mask_decommit(mi_commit_mask_t* cmask, void* p, size_t total, mi_stats_t* stats) {
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if (mi_commit_mask_is_empty(*cmask)) {
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// nothing
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}
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else if (mi_commit_mask_is_full(*cmask)) {
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_mi_os_decommit(p, total, stats);
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}
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else {
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// todo: one call to decommit the whole at once?
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mi_assert_internal((total%MI_COMMIT_MASK_BITS)==0);
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size_t part = total/MI_COMMIT_MASK_BITS;
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uintptr_t idx;
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uintptr_t count;
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mi_commit_mask_t mask = *cmask;
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mi_commit_mask_foreach(mask, idx, count) {
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void* start = (uint8_t*)p + (idx*part);
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size_t size = count*part;
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_mi_os_decommit(start, size, stats);
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}
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mi_commit_mask_foreach_end()
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}
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*cmask = mi_commit_mask_empty();
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}
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static void mi_cache_purge(mi_os_tld_t* tld) {
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UNUSED(tld);
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mi_msecs_t now = _mi_clock_now();
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@ -214,10 +248,11 @@ static void mi_cache_purge(mi_os_tld_t* tld) {
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if (expire != 0 && now >= expire) { // safe read
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// still expired, decommit it
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mi_atomic_storei64_relaxed(&slot->expire,(mi_msecs_t)0);
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mi_assert_internal(slot->is_committed && mi_bitmap_is_claimed(cache_available_large, MI_CACHE_FIELDS, 1, bitidx));
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mi_assert_internal(!mi_commit_mask_is_empty(slot->commit_mask) && mi_bitmap_is_claimed(cache_available_large, MI_CACHE_FIELDS, 1, bitidx));
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_mi_abandoned_await_readers(); // wait until safe to decommit
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_mi_os_decommit(slot->p, MI_SEGMENT_SIZE, tld->stats);
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slot->is_committed = false;
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// decommit committed parts
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mi_commit_mask_decommit(&slot->commit_mask, slot->p, MI_SEGMENT_SIZE, tld->stats);
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//_mi_os_decommit(slot->p, MI_SEGMENT_SIZE, tld->stats);
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}
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mi_bitmap_unclaim(cache_available, MI_CACHE_FIELDS, 1, bitidx); // make it available again for a pop
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}
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@ -226,7 +261,7 @@ static void mi_cache_purge(mi_os_tld_t* tld) {
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}
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}
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static bool mi_cache_push(void* start, size_t size, size_t memid, bool is_committed, bool is_large, mi_os_tld_t* tld)
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static bool mi_cache_push(void* start, size_t size, size_t memid, mi_commit_mask_t commit_mask, bool is_large, mi_os_tld_t* tld)
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{
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// only for segment blocks
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if (size != MI_SEGMENT_SIZE || ((uintptr_t)start % MI_SEGMENT_ALIGN) != 0) return false;
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@ -255,13 +290,12 @@ static bool mi_cache_push(void* start, size_t size, size_t memid, bool is_commit
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slot->p = start;
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slot->memid = memid;
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mi_atomic_storei64_relaxed(&slot->expire,(mi_msecs_t)0);
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slot->is_committed = is_committed;
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if (is_committed && !is_large) {
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slot->commit_mask = commit_mask;
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if (!mi_commit_mask_is_empty(commit_mask) && !is_large) {
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long delay = mi_option_get(mi_option_arena_reset_delay);
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if (delay == 0) {
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_mi_abandoned_await_readers(); // wait until safe to decommit
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_mi_os_decommit(start, size, tld->stats);
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slot->is_committed = false;
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mi_commit_mask_decommit(&slot->commit_mask, start, MI_SEGMENT_SIZE, tld->stats);
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}
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else {
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mi_atomic_storei64_release(&slot->expire, _mi_clock_now() + delay);
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@ -311,10 +345,10 @@ static void* mi_arena_alloc_from(mi_arena_t* arena, size_t arena_index, size_t n
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}
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void* _mi_arena_alloc_aligned(size_t size, size_t alignment,
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bool* commit, bool* large, bool* is_zero,
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bool commit, mi_commit_mask_t* commit_mask, bool* large, bool* is_zero,
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size_t* memid, mi_os_tld_t* tld)
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{
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mi_assert_internal(commit != NULL && large != NULL && is_zero != NULL && memid != NULL && tld != NULL);
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mi_assert_internal(commit_mask != NULL && large != NULL && is_zero != NULL && memid != NULL && tld != NULL);
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mi_assert_internal(size > 0);
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*memid = MI_MEMID_OS;
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*is_zero = false;
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@ -339,9 +373,13 @@ void* _mi_arena_alloc_aligned(size_t size, size_t alignment,
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if ((arena->numa_node<0 || arena->numa_node==numa_node) && // numa local?
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(*large || !arena->is_large)) // large OS pages allowed, or arena is not large OS pages
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{
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void* p = mi_arena_alloc_from(arena, i, bcount, commit, large, is_zero, memid, tld);
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bool acommit = commit;
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void* p = mi_arena_alloc_from(arena, i, bcount, &acommit, large, is_zero, memid, tld);
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mi_assert_internal((uintptr_t)p % alignment == 0);
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if (p != NULL) return p;
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if (p != NULL) {
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*commit_mask = (acommit ? mi_commit_mask_full() : mi_commit_mask_empty());
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return p;
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}
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}
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}
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// try from another numa node instead..
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@ -351,43 +389,52 @@ void* _mi_arena_alloc_aligned(size_t size, size_t alignment,
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if ((arena->numa_node>=0 && arena->numa_node!=numa_node) && // not numa local!
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(*large || !arena->is_large)) // large OS pages allowed, or arena is not large OS pages
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{
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void* p = mi_arena_alloc_from(arena, i, bcount, commit, large, is_zero, memid, tld);
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bool acommit = commit;
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void* p = mi_arena_alloc_from(arena, i, bcount, &acommit, large, is_zero, memid, tld);
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mi_assert_internal((uintptr_t)p % alignment == 0);
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if (p != NULL) return p;
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if (p != NULL) {
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*commit_mask = (acommit ? mi_commit_mask_full() : mi_commit_mask_empty());
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return p;
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}
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}
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}
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}
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// try to get from the cache
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void* p = mi_cache_pop(numa_node, size, alignment, commit, large, is_zero, memid, tld);
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void* p = mi_cache_pop(numa_node, size, alignment, commit, commit_mask, large, is_zero, memid, tld);
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if (p != NULL) return p;
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// finally, fall back to the OS
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*is_zero = true;
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*memid = MI_MEMID_OS;
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return _mi_os_alloc_aligned(size, alignment, *commit, large, tld);
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p = _mi_os_alloc_aligned(size, alignment, commit, large, tld);
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*commit_mask = ((p!=NULL && commit) ? mi_commit_mask_full() : mi_commit_mask_empty());
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return p;
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}
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void* _mi_arena_alloc(size_t size, bool* commit, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld)
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void* _mi_arena_alloc(size_t size, bool commit, mi_commit_mask_t* commit_mask, bool* large, bool* is_zero, size_t* memid, mi_os_tld_t* tld)
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{
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return _mi_arena_alloc_aligned(size, MI_ARENA_BLOCK_SIZE, commit, large, is_zero, memid, tld);
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return _mi_arena_alloc_aligned(size, MI_ARENA_BLOCK_SIZE, commit, commit_mask, large, is_zero, memid, tld);
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}
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/* -----------------------------------------------------------
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Arena free
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----------------------------------------------------------- */
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void _mi_arena_free(void* p, size_t size, size_t memid, bool is_committed, bool is_large, mi_os_tld_t* tld) {
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void _mi_arena_free(void* p, size_t size, size_t memid, mi_commit_mask_t commit_mask, bool is_large, mi_os_tld_t* tld) {
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mi_assert_internal(size > 0 && tld->stats != NULL);
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if (p==NULL) return;
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if (size==0) return;
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if (memid == MI_MEMID_OS) {
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// was a direct OS allocation, pass through
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if (!mi_cache_push(p, size, memid, is_committed, is_large, tld)) {
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_mi_abandoned_await_readers(); // wait unti safe to free
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_mi_os_free_ex(p, size, is_committed, tld->stats);
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if (!mi_cache_push(p, size, memid, commit_mask, is_large, tld)) {
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_mi_abandoned_await_readers(); // wait until safe to free
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// TODO: is it safe on all platforms to free even it contains decommitted parts? (eg. macOS)
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const size_t csize = mi_commit_mask_committed_size(commit_mask, size);
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_mi_stat_decrease(&_mi_stats_main.committed, csize);
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_mi_os_free_ex(p, size, false /*pretend decommitted to not double count stats*/, tld->stats);
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}
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}
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else {
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@ -65,7 +65,7 @@ static mi_option_desc_t options[_mi_option_last] =
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{ 0, UNINIT, MI_OPTION(verbose) },
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// the following options are experimental and not all combinations make sense.
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{ 1, UNINIT, MI_OPTION(eager_commit) }, // commit per segment directly (4MiB) (but see also `eager_commit_delay`)
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{ 1, UNINIT, MI_OPTION(eager_commit) }, // commit per segment directly (8MiB) (but see also `eager_commit_delay`)
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#if defined(_WIN32) || (MI_INTPTR_SIZE <= 4) // and other OS's without overcommit?
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{ 0, UNINIT, MI_OPTION(eager_region_commit) },
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{ 0, UNINIT, MI_OPTION(reset_decommits) }, // reset decommits memory
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@ -82,7 +82,7 @@ static mi_option_desc_t options[_mi_option_last] =
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#if defined(__NetBSD__)
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{ 0, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed
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#else
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{ 1, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed (but per page in the segment on demand)
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{ 4, UNINIT, MI_OPTION(eager_commit_delay) }, // the first N segments per thread are not eagerly committed (but per page in the segment on demand)
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#endif
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{ 1, UNINIT, MI_OPTION(allow_decommit) }, // decommit pages when not eager committed
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{ 250, UNINIT, MI_OPTION(reset_delay) }, // reset delay in milli-seconds
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@ -137,7 +137,7 @@ static bool mi_segment_is_valid(mi_segment_t* segment, mi_segments_tld_t* tld) {
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mi_assert_internal(_mi_ptr_cookie(segment) == segment->cookie);
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mi_assert_internal(segment->abandoned <= segment->used);
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mi_assert_internal(segment->thread_id == 0 || segment->thread_id == _mi_thread_id());
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mi_assert_internal((segment->commit_mask & segment->decommit_mask) == segment->decommit_mask); // can only decommit committed blocks
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mi_assert_internal(mi_commit_mask_all_set(segment->commit_mask, segment->decommit_mask)); // can only decommit committed blocks
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//mi_assert_internal(segment->segment_info_size % MI_SEGMENT_SLICE_SIZE == 0);
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mi_slice_t* slice = &segment->slices[0];
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const mi_slice_t* end = mi_segment_slices_end(segment);
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@ -268,8 +268,7 @@ static void mi_segment_os_free(mi_segment_t* segment, mi_segments_tld_t* tld) {
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// mi_segment_delayed_decommit(segment,true,tld->stats);
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// _mi_os_free(segment, mi_segment_size(segment), /*segment->memid,*/ tld->stats);
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bool fully_committed = (mi_commit_mask_is_full(segment->commit_mask) && mi_commit_mask_is_empty(segment->decommit_mask));
|
||||
_mi_arena_free(segment, mi_segment_size(segment), segment->memid, fully_committed, segment->mem_is_fixed, tld->os);
|
||||
_mi_arena_free(segment, mi_segment_size(segment), segment->memid, segment->commit_mask, segment->mem_is_fixed, tld->os);
|
||||
}
|
||||
|
||||
|
||||
@ -382,11 +381,15 @@ static bool mi_segment_commitx(mi_segment_t* segment, bool commit, uint8_t* p, s
|
||||
|
||||
if (commit && !mi_commit_mask_all_set(segment->commit_mask, mask)) {
|
||||
bool is_zero = false;
|
||||
if (!_mi_os_commit(start,full_size,&is_zero,stats)) return false;
|
||||
mi_commit_mask_t cmask = mi_commit_mask_intersect(segment->commit_mask, mask);
|
||||
_mi_stat_decrease(&_mi_stats_main.committed, mi_commit_mask_committed_size(cmask, MI_SEGMENT_SIZE)); // adjust for overlap
|
||||
if (!_mi_os_commit(start,full_size,&is_zero,stats)) return false;
|
||||
mi_commit_mask_set(&segment->commit_mask,mask);
|
||||
}
|
||||
else if (!commit && mi_commit_mask_any_set(segment->commit_mask,mask)) {
|
||||
mi_assert_internal((void*)start != (void*)segment);
|
||||
mi_commit_mask_t cmask = mi_commit_mask_intersect(segment->commit_mask, mask);
|
||||
_mi_stat_increase(&_mi_stats_main.committed, full_size - mi_commit_mask_committed_size(cmask, MI_SEGMENT_SIZE)); // adjust for overlap
|
||||
_mi_os_decommit(start, full_size, stats); // ok if this fails
|
||||
mi_commit_mask_clear(&segment->commit_mask, mask);
|
||||
}
|
||||
@ -401,6 +404,7 @@ static bool mi_segment_commitx(mi_segment_t* segment, bool commit, uint8_t* p, s
|
||||
}
|
||||
|
||||
static bool mi_segment_ensure_committed(mi_segment_t* segment, uint8_t* p, size_t size, mi_stats_t* stats) {
|
||||
mi_assert_internal(mi_commit_mask_all_set(segment->commit_mask, segment->decommit_mask));
|
||||
if (mi_commit_mask_is_full(segment->commit_mask) && mi_commit_mask_is_empty(segment->decommit_mask)) return true; // fully committed
|
||||
return mi_segment_commitx(segment,true,p,size,stats);
|
||||
}
|
||||
@ -648,29 +652,30 @@ static mi_segment_t* mi_segment_init(mi_segment_t* segment, size_t required, mi_
|
||||
// Commit eagerly only if not the first N lazy segments (to reduce impact of many threads that allocate just a little)
|
||||
const bool eager_delay = (tld->count < (size_t)mi_option_get(mi_option_eager_commit_delay));
|
||||
const bool eager = !eager_delay && mi_option_is_enabled(mi_option_eager_commit);
|
||||
bool commit = eager || (required > 0);
|
||||
const bool commit = eager || (required > 0);
|
||||
|
||||
// Try to get from our cache first
|
||||
bool is_zero = false;
|
||||
const bool commit_info_still_good = (segment != NULL);
|
||||
mi_commit_mask_t commit_mask = (segment != NULL ? segment->commit_mask : mi_commit_mask_empty());
|
||||
if (segment==NULL) {
|
||||
// Allocate the segment from the OS
|
||||
bool mem_large = (!eager_delay && (MI_SECURE==0)); // only allow large OS pages once we are no longer lazy
|
||||
size_t memid = 0;
|
||||
// segment = (mi_segment_t*)_mi_os_alloc_aligned(segment_size, MI_SEGMENT_SIZE, commit, &mem_large, os_tld);
|
||||
segment = (mi_segment_t*)_mi_arena_alloc_aligned(segment_size, MI_SEGMENT_SIZE, &commit, &mem_large, &is_zero, &memid, os_tld);
|
||||
|
||||
segment = (mi_segment_t*)_mi_arena_alloc_aligned(segment_size, MI_SEGMENT_SIZE, commit, &commit_mask, &mem_large, &is_zero, &memid, os_tld);
|
||||
if (segment == NULL) return NULL; // failed to allocate
|
||||
mi_assert_internal(segment != NULL && (uintptr_t)segment % MI_SEGMENT_SIZE == 0);
|
||||
if (!commit) {
|
||||
|
||||
if (!mi_commit_mask_all_set(commit_mask,mi_commit_mask_create(0, 1))) {
|
||||
// at least commit the info slices
|
||||
mi_assert_internal(MI_COMMIT_SIZE > info_slices*MI_SEGMENT_SLICE_SIZE);
|
||||
bool ok = _mi_os_commit(segment, MI_COMMIT_SIZE, &is_zero, tld->stats);
|
||||
if (!ok) return NULL; // failed to commit
|
||||
if (!ok) return NULL; // failed to commit
|
||||
mi_commit_mask_set(&commit_mask,mi_commit_mask_create(0, 1));
|
||||
}
|
||||
segment->memid = memid;
|
||||
segment->mem_is_fixed = mem_large;
|
||||
segment->mem_is_committed = commit;
|
||||
segment->mem_is_committed = mi_commit_mask_is_full(commit_mask);
|
||||
mi_segments_track_size((long)(segment_size), tld);
|
||||
mi_segment_map_allocated_at(segment);
|
||||
}
|
||||
@ -684,7 +689,7 @@ static mi_segment_t* mi_segment_init(mi_segment_t* segment, size_t required, mi_
|
||||
}
|
||||
|
||||
if (!commit_info_still_good) {
|
||||
segment->commit_mask = (!commit ? 0x01 : mi_commit_mask_full()); // on lazy commit, the initial part is always committed
|
||||
segment->commit_mask = commit_mask; // on lazy commit, the initial part is always committed
|
||||
segment->allow_decommit = (mi_option_is_enabled(mi_option_allow_decommit) && !segment->mem_is_fixed);
|
||||
segment->decommit_expire = 0;
|
||||
segment->decommit_mask = mi_commit_mask_empty();
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user