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merge from dev-exp; better abandoned reclamation

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daan 2020-01-27 22:12:23 -08:00
commit b50bec463d
25 changed files with 661 additions and 337 deletions
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12
src/arena.c
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@ -77,8 +77,8 @@ typedef struct mi_arena_s {
// The available arenas
static _Atomic(mi_arena_t*) mi_arenas[MI_MAX_ARENAS];
static _Atomic(uintptr_t) mi_arena_count; // = 0
static mi_decl_cache_align _Atomic(mi_arena_t*) mi_arenas[MI_MAX_ARENAS];
static mi_decl_cache_align _Atomic(uintptr_t) mi_arena_count; // = 0
/* -----------------------------------------------------------
@ -114,6 +114,7 @@ static bool mi_arena_alloc(mi_arena_t* arena, size_t blocks, mi_bitmap_index_t*
size_t idx = mi_atomic_read(&arena->search_idx); // start from last search
for (size_t visited = 0; visited < fcount; visited++, idx++) {
if (idx >= fcount) idx = 0; // wrap around
// try to atomically claim a range of bits
if (mi_bitmap_try_find_claim_field(arena->blocks_inuse, idx, blocks, bitmap_idx)) {
mi_atomic_write(&arena->search_idx, idx); // start search from here next time
return true;
@ -213,6 +214,7 @@ static void mi_cache_purge(mi_os_tld_t* tld) {
if (mi_atomic_cas_ptr_weak(mi_cache_slot_t, &slot->p, MI_SLOT_IN_USE, p)) {
// claimed! test again
if (slot->is_committed && !slot->is_large && now >= slot->expire) {
_mi_abandoned_await_readers(); // wait until safe to decommit
_mi_os_decommit(p, MI_SEGMENT_SIZE, tld->stats);
slot->is_committed = false;
}
@ -251,6 +253,7 @@ static bool mi_cache_push(void* start, size_t size, size_t memid, bool is_commit
if (is_committed) {
long delay = mi_option_get(mi_option_arena_reset_delay);
if (delay == 0 && !is_large) {
_mi_abandoned_await_readers(); // wait until safe to decommit
_mi_os_decommit(start, size, tld->stats);
slot->is_committed = false;
}
@ -286,8 +289,8 @@ static void* mi_arena_alloc_from(mi_arena_t* arena, size_t arena_index, size_t n
// always committed
*commit = true;
}
else if (commit) {
// ensure commit now
else if (*commit) {
// arena not committed as a whole, but commit requested: ensure commit now
bool any_uncommitted;
mi_bitmap_claim(arena->blocks_committed, arena->field_count, needed_bcount, bitmap_index, &any_uncommitted);
if (any_uncommitted) {
@ -379,6 +382,7 @@ void _mi_arena_free(void* p, size_t size, size_t memid, bool is_committed, bool
if (memid == MI_MEMID_OS) {
// was a direct OS allocation, pass through
if (!mi_cache_push(p, size, memid, is_committed, is_large, tld)) {
_mi_abandoned_await_readers(); // wait unti safe to free
_mi_os_free_ex(p, size, is_committed, tld->stats);
}
}