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8048895: Back out JDK-8027915

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Reviewed-by: mgerdin, stefank
This commit is contained in:
Erik Helin 2014-07-02 11:05:10 +02:00
parent cc98923725
commit 40e186ac67
9 changed files with 40 additions and 89 deletions
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18
hotspot/src/share/vm/runtime/os.hpp
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@ -253,11 +253,19 @@ class os: AllStatic {
// Return the default page size.
static int vm_page_size();
// Returns the page size to use for a region of memory.
// region_size / min_pages will always be greater than or equal to the
// returned value.
static size_t page_size_for_region(size_t region_size, size_t min_pages);
// Return the page size to use for a region of memory. The min_pages argument
// is a hint intended to limit fragmentation; it says the returned page size
// should be <= region_max_size / min_pages. Because min_pages is a hint,
// this routine may return a size larger than region_max_size / min_pages.
//
// The current implementation ignores min_pages if a larger page size is an
// exact multiple of both region_min_size and region_max_size. This allows
// larger pages to be used when doing so would not cause fragmentation; in
// particular, a single page can be used when region_min_size ==
// region_max_size == a supported page size.
static size_t page_size_for_region(size_t region_min_size,
size_t region_max_size,
uint min_pages);
// Return the largest page size that can be used
static size_t max_page_size() {
// The _page_sizes array is sorted in descending order.