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wip: purgeable arenas

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This commit is contained in:
daanx 2023-04-04 11:46:02 -07:00
parent 33d7503fdb
commit 09297ba8cf
5 changed files with 68 additions and 53 deletions
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7
src/arena.c
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@ -163,7 +163,7 @@ static mi_decl_noinline void* mi_arena_alloc_from(mi_arena_t* arena, size_t aren
// none of the claimed blocks should be scheduled for a decommit
if (arena->blocks_purge != NULL) {
// this is thread safe as a potential purge only decommits parts that are not yet claimed as used (in `in_use`).
// this is thread safe as a potential purge only decommits parts that are not yet claimed as used (in `blocks_inuse`).
_mi_bitmap_unclaim_across(arena->blocks_purge, arena->field_count, needed_bcount, bitmap_index);
}
@ -176,7 +176,7 @@ static mi_decl_noinline void* mi_arena_alloc_from(mi_arena_t* arena, size_t aren
*commit = true;
}
else if (*commit) {
// arena not committed as a whole, but commit requested: ensure commit now
// commit requested, but the range may not be committed as a whole: ensure it is committed now
bool any_uncommitted;
_mi_bitmap_claim_across(arena->blocks_committed, arena->field_count, needed_bcount, bitmap_index, &any_uncommitted);
if (any_uncommitted) {
@ -294,7 +294,8 @@ void* _mi_arena_alloc_aligned(size_t size, size_t alignment, size_t align_offset
arena_reserve = _mi_align_up(arena_reserve, MI_ARENA_BLOCK_SIZE);
if (arena_reserve > 0 && arena_reserve >= size && // eager reserve enabled and large enough?
req_arena_id == _mi_arena_id_none() && // not exclusive?
mi_atomic_load_relaxed(&mi_arena_count) < 3*(MI_MAX_ARENAS/4) ) // not too many arenas already?
mi_atomic_load_relaxed(&mi_arena_count) < 3*(MI_MAX_ARENAS/4) && // not too many arenas already?
!_mi_preloading() ) // and not before main runs
{
mi_arena_id_t arena_id = 0;