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@@ -585,6 +585,12 @@ void *osReserveHeapMemory(void *startAddressPtr, W_ *len) |
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585
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585
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}
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586
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586
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#endif
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587
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587
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588
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+ const int MAX_ATTEMPTS = 8;
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589
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+ void *bad_allocs[MAX_ATTEMPTS];
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590
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+ size_t bad_alloc_lens[MAX_ATTEMPTS];
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591
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+ memset(bad_allocs, 0, sizeof(void*) * MAX_ATTEMPTS);
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592
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+ memset(bad_alloc_lens, 0, sizeof(size_t) * MAX_ATTEMPTS);
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593
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+
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588
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594
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attempt = 0;
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589
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595
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while (attempt < MAX_ATTEMPTS) {
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590
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596
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*len &= ~MBLOCK_MASK;
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@@ -611,18 +617,31 @@ void *osReserveHeapMemory(void *startAddressPtr, W_ *len) |
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611
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617
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} else if ((W_)at >= minimumAddress) {
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612
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618
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// Success! We were given a block of memory starting above the 8 GB
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613
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619
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// mark, which is what we were looking for.
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614
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-
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615
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620
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break;
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616
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621
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} else {
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617
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622
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// We got addressing space but it wasn't above the 8GB mark.
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618
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- // Try again.
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619
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- if (munmap(at, *len) < 0) {
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620
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- sysErrorBelch("unable to release reserved heap");
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623
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+ // Free any portion *above* 8GB and hang on to the rest to increase
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624
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+ // the likelihood that we get a suitable allocation next iteration.
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625
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+ uintptr_t end = (W_) at + *len;
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626
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+ bad_allocs[attempt] = at;
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627
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+ if (end > minimumAddress) {
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628
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+ if (munmap((void *) minimumAddress, end - minimumAddress) < 0) {
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629
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+ sysErrorBelch("unable to release high portion of low memory reservation");
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630
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+ }
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631
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+ bad_alloc_lens[attempt] = minimumAddress - (W_) at;
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632
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+ } else {
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633
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+ bad_alloc_lens[attempt] = *len;
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621
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634
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}
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622
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635
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}
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623
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636
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attempt++;
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624
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637
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}
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625
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638
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639
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+ for (int i=0; i < MAX_ATTEMPTS; i++) {
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640
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+ if (bad_allocs[i] != NULL && munmap(bad_allocs[i], bad_alloc_lens[i]) < 0) {
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641
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+ sysErrorBelch("unable to release reserved heap");
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642
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+ }
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643
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+ }
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644
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+
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626
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645
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if (at == NULL) {
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627
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646
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sysErrorBelch("failed to reserve heap memory");
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628
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647
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}
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