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set delayed decommit mask more precisely to only decommit currently committed blocks

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daan 2020-08-28 08:46:51 -07:00
parent 2cffc3b851
commit e4ddc75069
2 changed files with 8 additions and 6 deletions
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2
include/mimalloc-types.h
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@ -264,7 +264,7 @@ typedef mi_page_t mi_slice_t;
typedef int64_t mi_msecs_t;
// Segments are large allocated memory blocks (2mb on 64 bit) from
// Segments are large allocated memory blocks (8mb on 64 bit) from
// the OS. Inside segments we allocated fixed size _pages_ that
// contain blocks.
typedef struct mi_segment_s {

12
src/segment.c
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@ -137,6 +137,7 @@ static bool mi_segment_is_valid(mi_segment_t* segment, mi_segments_tld_t* tld) {
mi_assert_internal(_mi_ptr_cookie(segment) == segment->cookie);
mi_assert_internal(segment->abandoned <= segment->used);
mi_assert_internal(segment->thread_id == 0 || segment->thread_id == _mi_thread_id());
mi_assert_internal((segment->commit_mask & segment->decommit_mask) == segment->decommit_mask); // can only decommit committed blocks
//mi_assert_internal(segment->segment_info_size % MI_SEGMENT_SLICE_SIZE == 0);
mi_slice_t* slice = &segment->slices[0];
const mi_slice_t* end = mi_segment_slices_end(segment);
@ -414,8 +415,9 @@ static void mi_segment_commitx(mi_segment_t* segment, bool commit, uint8_t* p, s
if (commit && (segment->decommit_mask & mask) != 0) {
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_reset_delay);
}
// always undo delayed decommits
segment->decommit_mask &= ~mask;
// always undo delayed decommits
segment->decommit_mask &= ~mask;
mi_assert_internal((segment->commit_mask & segment->decommit_mask) == segment->decommit_mask);
}
static void mi_segment_ensure_committed(mi_segment_t* segment, uint8_t* p, size_t size, mi_stats_t* stats) {
@ -425,19 +427,19 @@ static void mi_segment_ensure_committed(mi_segment_t* segment, uint8_t* p, size_
static void mi_segment_perhaps_decommit(mi_segment_t* segment, uint8_t* p, size_t size, mi_stats_t* stats) {
if (!segment->allow_decommit) return;
if (segment->commit_mask == 1) return; // fully decommitted
if (segment->commit_mask == 1) return; // fully decommitted (1 = the initial segment metadata span)
if (mi_option_get(mi_option_reset_delay) == 0) {
mi_segment_commitx(segment, false, p, size, stats);
}
else {
// create mask
// register for future decommit in the decommit mask
uint8_t* start;
size_t full_size;
uintptr_t mask = mi_segment_commit_mask(segment, true /*conservative*/, p, size, &start, &full_size);
if (mask==0 || full_size==0) return;
// update delayed commit
segment->decommit_mask |= mask;
segment->decommit_mask |= (mask & segment->commit_mask); // only decommit what is committed; span_free may try to decommit more
segment->decommit_expire = _mi_clock_now() + mi_option_get(mi_option_reset_delay);
}
}