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When shrinking semispace don't relink pages if semispace is not committed

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R=mstarzinger@chromium.org

Review URL: http://codereview.chromium.org/9086005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10333 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
vegorov@chromium.org 2012-01-04 19:59:01 +00:00
parent 2335545108
commit e726c00ea6
1 changed files with 22 additions and 17 deletions
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39
src/spaces.cc
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@ -1256,24 +1256,29 @@ bool SemiSpace::ShrinkTo(int new_capacity) {
ASSERT((new_capacity & Page::kPageAlignmentMask) == 0);
ASSERT(new_capacity >= initial_capacity_);
ASSERT(new_capacity < capacity_);
// Semispaces grow backwards from the end of their allocated capacity,
// so we find the before and after start addresses relative to the
// end of the space.
Address space_end = start_ + maximum_capacity_;
Address old_start = space_end - capacity_;
size_t delta = capacity_ - new_capacity;
ASSERT(IsAligned(delta, OS::AllocateAlignment()));
if (!heap()->isolate()->memory_allocator()->UncommitBlock(old_start, delta)) {
return false;
}
capacity_ = new_capacity;
if (is_committed()) {
// Semispaces grow backwards from the end of their allocated capacity,
// so we find the before and after start addresses relative to the
// end of the space.
Address space_end = start_ + maximum_capacity_;
Address old_start = space_end - capacity_;
size_t delta = capacity_ - new_capacity;
ASSERT(IsAligned(delta, OS::AllocateAlignment()));
int pages_after = capacity_ / Page::kPageSize;
NewSpacePage* new_last_page =
NewSpacePage::FromAddress(space_end - pages_after * Page::kPageSize);
new_last_page->set_next_page(anchor());
anchor()->set_prev_page(new_last_page);
ASSERT((current_page_ <= first_page()) && (current_page_ >= new_last_page));
MemoryAllocator* allocator = heap()->isolate()->memory_allocator();
if (!allocator->UncommitBlock(old_start, delta)) {
return false;
}
int pages_after = new_capacity / Page::kPageSize;
NewSpacePage* new_last_page =
NewSpacePage::FromAddress(space_end - pages_after * Page::kPageSize);
new_last_page->set_next_page(anchor());
anchor()->set_prev_page(new_last_page);
ASSERT((current_page_ <= first_page()) && (current_page_ >= new_last_page));
}
capacity_ = new_capacity;
return true;
}