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6843292: "Expect to be beyond new region unless impacting another region" assertion too strong

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In the assertion allow for collision with the guard page.

Reviewed-by: tonyp, ysr, jcoomes
This commit is contained in:
Jon Masamitsu 2009-08-02 19:10:31 -07:00
parent 968de64586
commit bd1c93a58e
1 changed files with 11 additions and 3 deletions
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14
hotspot/src/share/vm/memory/cardTableModRefBS.cpp
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@ -253,8 +253,16 @@ void CardTableModRefBS::resize_covered_region(MemRegion new_region) {
}
#endif
// The guard page is always committed and should not be committed over.
HeapWord* const new_end_for_commit = MIN2(new_end_aligned,
_guard_region.start());
// "guarded" is used for assertion checking below and recalls the fact
// that the would-be end of the new committed region would have
// penetrated the guard page.
HeapWord* new_end_for_commit = new_end_aligned;
DEBUG_ONLY(bool guarded = false;)
if (new_end_for_commit > _guard_region.start()) {
new_end_for_commit = _guard_region.start();
DEBUG_ONLY(guarded = true;)
}
if (new_end_for_commit > cur_committed.end()) {
// Must commit new pages.
@ -302,7 +310,7 @@ void CardTableModRefBS::resize_covered_region(MemRegion new_region) {
// not the aligned up expanded region.
// jbyte* const end = byte_after(new_region.last());
jbyte* const end = (jbyte*) new_end_for_commit;
assert((end >= byte_after(new_region.last())) || collided,
assert((end >= byte_after(new_region.last())) || collided || guarded,
"Expect to be beyond new region unless impacting another region");
// do nothing if we resized downward.
#ifdef ASSERT