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support non- eager_commit; on larson reduces commit charge 10x, but other benchmarks often see no improvement

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This commit is contained in:
daan 2019-07-09 21:34:56 -07:00
parent 2ef1f1df94
commit 3009a7b1fe
2 changed files with 18 additions and 3 deletions
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2
include/mimalloc-internal.h
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@ -39,6 +39,8 @@ uintptr_t _mi_random_init(uintptr_t seed /* can be zero */);
// "os.c"
bool _mi_os_reset(void* p, size_t size, mi_stats_t* stats);
bool _mi_os_unreset(void* addr, size_t size, mi_stats_t* stats);
bool _mi_os_commit(void* addr, size_t size, mi_stats_t* stats);
bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats);
void* _mi_os_alloc(size_t size, mi_stats_t* stats);
bool _mi_os_shrink(void* p, size_t oldsize, size_t newsize, mi_stats_t* stats);
void _mi_os_free(void* p, size_t size, mi_stats_t* stats);

19
src/segment.c
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@ -344,6 +344,7 @@ static mi_segment_t* mi_segment_alloc( size_t required, mi_page_kind_t page_kind
mi_segment_t* segment = NULL;
// try to get it from our caches
bool commit = mi_option_is_enabled(mi_option_eager_commit) || (page_kind != MI_PAGE_SMALL);
bool protection_still_good = false;
segment = mi_segment_cache_find(tld,segment_size);
mi_assert_internal(segment == NULL ||
@ -361,13 +362,17 @@ static mi_segment_t* mi_segment_alloc( size_t required, mi_page_kind_t page_kind
}
// and otherwise allocate it from the OS
else {
segment = (mi_segment_t*)_mi_os_alloc_aligned(segment_size, MI_SEGMENT_SIZE, true, os_tld);
segment = (mi_segment_t*)_mi_os_alloc_aligned(segment_size, MI_SEGMENT_SIZE, commit, os_tld);
if (segment == NULL) return NULL;
mi_segments_track_size((long)segment_size,tld);
}
mi_assert_internal(segment != NULL && (uintptr_t)segment % MI_SEGMENT_SIZE == 0);
if (!commit) {
_mi_os_commit(segment,info_size,tld->stats);
}
memset(segment, 0, info_size);
if (mi_option_is_enabled(mi_option_secure) && !protection_still_good) {
// in secure mode, we set up a protected page in between the segment info
// and the page data
@ -395,6 +400,7 @@ static mi_segment_t* mi_segment_alloc( size_t required, mi_page_kind_t page_kind
segment->cookie = _mi_ptr_cookie(segment);
for (uint8_t i = 0; i < segment->capacity; i++) {
segment->pages[i].segment_idx = i;
segment->pages[i].is_reset = !commit;
}
_mi_stat_increase(&tld->stats->page_committed, segment->segment_info_size);
//fprintf(stderr,"mimalloc: alloc segment at %p\n", (void*)segment);
@ -472,7 +478,14 @@ static mi_page_t* mi_segment_find_free(mi_segment_t* segment, mi_stats_t* stats)
size_t psize;
uint8_t* start = _mi_page_start(segment, page, &psize);
page->is_reset = false;
_mi_os_unreset(start, psize, stats);
if (mi_option_is_enabled(mi_option_eager_commit)) {
_mi_os_unreset(start, psize, stats);
}
else {
// note we could allow both lazy commit, and page level reset if we add a `is_commit` flag...
// for now we use commit for both
_mi_os_commit(start, psize, stats);
}
}
return page;
}