MemRegion G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
// We need to make sure to commit all pages covered by the given area.
guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
if (!_special) {
os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
}
_committed.set_range(start, start + size_in_pages);
MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize);
return result;
}
bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
// We need to make sure to commit all pages covered by the given area.
guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
bool zero_filled = true;
size_t end_page = start_page + size_in_pages;
if (_special) {
// Check for dirty pages and update zero_filled if any found.
if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
zero_filled = false;
_dirty.clear_range(start_page, end_page);
}
} else {
commit_internal(start_page, end_page);
}
_committed.set_range(start_page, end_page);
if (AlwaysPreTouch) {
pretouch_internal(start_page, end_page);
}
return zero_filled;
}
