kiper220/mimalloc
1
0
Fork 0
mirror of https://github.com/microsoft/mimalloc.git synced 2025-05-06 15:29:31 +03:00
Code Issues Projects Releases Packages Wiki Activity Actions

Merge branch 'dev-steal' into dev-slice-steal

Browse source
This commit is contained in:
daanx 2024-10-09 14:35:49 -07:00
commit 03fbaedec5
2 changed files with 65 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
src/page-queue.c
View file

@ -265,7 +265,7 @@ static void mi_page_queue_push(mi_heap_t* heap, mi_page_queue_t* queue, mi_page_
}
static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
static void mi_page_queue_enqueue_from_ex(mi_page_queue_t* to, mi_page_queue_t* from, bool enqueue_at_end, mi_page_t* page) {
mi_assert_internal(page != NULL);
mi_assert_expensive(mi_page_queue_contains(from, page));
mi_assert_expensive(!mi_page_queue_contains(to, page));
@ -278,6 +278,8 @@ static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* fro
(mi_page_is_large_or_huge(page) && mi_page_queue_is_full(to)));
mi_heap_t* heap = mi_page_heap(page);
// delete from `from`
if (page->prev != NULL) page->prev->next = page->next;
if (page->next != NULL) page->next->prev = page->prev;
if (page == from->last) from->last = page->prev;
@ -288,6 +290,9 @@ static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* fro
mi_heap_queue_first_update(heap, from);
}
// insert into `to`
if (enqueue_at_end) {
// enqueue at the end
page->prev = to->last;
page->next = NULL;
if (to->last != NULL) {
@ -300,10 +305,43 @@ static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* fro
to->last = page;
mi_heap_queue_first_update(heap, to);
}
}
else {
if (to->first != NULL) {
// enqueue at 2nd place
mi_assert_internal(heap == mi_page_heap(to->first));
mi_page_t* next = to->first->next;
page->prev = to->first;
page->next = next;
to->first->next = page;
if (next != NULL) {
next->prev = page;
}
else {
to->last = page;
}
}
else {
// enqueue at the head (singleton list)
page->prev = NULL;
page->next = NULL;
to->first = page;
to->last = page;
mi_heap_queue_first_update(heap, to);
}
}
mi_page_set_in_full(page, mi_page_queue_is_full(to));
}
static void mi_page_queue_enqueue_from(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
mi_page_queue_enqueue_from_ex(to, from, true, page);
}
static void mi_page_queue_enqueue_from_at_start(mi_page_queue_t* to, mi_page_queue_t* from, mi_page_t* page) {
mi_page_queue_enqueue_from_ex(to, from, false, page);
}
// Only called from `mi_heap_absorb`.
size_t _mi_page_queue_append(mi_heap_t* heap, mi_page_queue_t* pq, mi_page_queue_t* append) {
mi_assert_internal(mi_heap_contains_queue(heap,pq));

31
src/page.c
View file

@ -358,7 +358,7 @@ void _mi_page_unfull(mi_page_t* page) {
mi_page_set_in_full(page, false); // to get the right queue
mi_page_queue_t* pq = mi_heap_page_queue_of(heap, page);
mi_page_set_in_full(page, true);
mi_page_queue_enqueue_from(pq, pqfull, page);
mi_page_queue_enqueue_from_at_start(pq, pqfull, page); // insert at the start to increase the chance of reusing full pages (?)
}
static void mi_page_to_full(mi_page_t* page, mi_page_queue_t* pq) {
@ -718,14 +718,17 @@ static void mi_page_init(mi_heap_t* heap, mi_page_t* page, size_t block_size, mi
Find pages with free blocks
-------------------------------------------------------------*/
// search for a best next page to use for at most N pages (often cut short if immediate blocks are available)
#define MI_MAX_CANDIDATE_SEARCH (16)
static inline bool mi_page_is_expandable(const mi_page_t* page) {
// is the page not yet used up to its reserved space?
static bool mi_page_is_expandable(const mi_page_t* page) {
mi_assert_internal(page != NULL);
mi_assert_internal(page->capacity <= page->reserved);
return (page->capacity < page->reserved);
}
// Find a page with free blocks of `page->block_size`.
static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* pq, bool first_try)
{
@ -743,14 +746,17 @@ static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* p
count++;
#endif
candidate_count++;
// collect freed blocks by us and other threads
_mi_page_free_collect(page, false);
#if defined(MI_MAX_CANDIDATE_SEARCH)
// 0. collect freed blocks by us and other threads
_mi_page_free_collect(page, false); // todo: should we free empty pages?
// search up to N pages for a best candidate
// is the local free list non-empty?
const bool immediate_available = mi_page_immediate_available(page);
// 1. If the page is completely full, move it to the `mi_pages_full`
// if the page is completely full, move it to the `mi_pages_full`
// queue so we don't visit long-lived pages too often.
if (!immediate_available && !mi_page_is_expandable(page)) {
mi_assert_internal(!mi_page_is_in_full(page) && !mi_page_immediate_available(page));
@ -766,25 +772,20 @@ static mi_page_t* mi_page_queue_find_free_ex(mi_heap_t* heap, mi_page_queue_t* p
else if (!mi_page_is_expandable(page) && page->used > page_candidate->used) {
page_candidate = page;
}
// if we find a non-expandable candidate, or searched for N pages, return with the best candidate
if (immediate_available || candidate_count > MI_MAX_CANDIDATE_SEARCH) {
mi_assert_internal(page_candidate!=NULL);
break;
}
}
#else
// 1. if the page contains free blocks, we are done
if (mi_page_immediate_available(page)) {
// first-fit algorithm
// If the page contains free blocks, we are done
if (mi_page_immediate_available(page) || mi_page_is_expandable(page)) {
break; // pick this one
}
// 2. Try to extend
if (page->capacity < page->reserved) {
mi_page_extend_free(heap, page, heap->tld);
mi_assert_internal(mi_page_immediate_available(page));
break;
}
// 3. If the page is completely full, move it to the `mi_pages_full`
// If the page is completely full, move it to the `mi_pages_full`
// queue so we don't visit long-lived pages too often.
mi_assert_internal(!mi_page_is_in_full(page) && !mi_page_immediate_available(page));
mi_page_to_full(page, pq);