--- a/hotspot/src/share/vm/gc/g1/g1RegionToSpaceMapper.cpp Thu Sep 15 12:10:43 2016 -0400
+++ b/hotspot/src/share/vm/gc/g1/g1RegionToSpaceMapper.cpp Fri Sep 16 11:33:47 2016 +0200
@@ -66,8 +66,12 @@
guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity");
}
- virtual void commit_regions(uint start_idx, size_t num_regions) {
- bool zero_filled = _storage.commit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region);
+ virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
+ size_t const start_page = (size_t)start_idx * _pages_per_region;
+ bool zero_filled = _storage.commit(start_page, num_regions * _pages_per_region);
+ if (AlwaysPreTouch) {
+ _storage.pretouch(start_page, num_regions * _pages_per_region, pretouch_gang);
+ }
_commit_map.set_range(start_idx, start_idx + num_regions);
fire_on_commit(start_idx, num_regions, zero_filled);
}
@@ -110,19 +114,38 @@
_refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_size_up(rs.size(), page_size)), page_size);
}
- virtual void commit_regions(uint start_idx, size_t num_regions) {
+ virtual void commit_regions(uint start_idx, size_t num_regions, WorkGang* pretouch_gang) {
+ size_t const NoPage = ~(size_t)0;
+
+ size_t first_committed = NoPage;
+ size_t num_committed = 0;
+
+ bool all_zero_filled = true;
+
for (uint i = start_idx; i < start_idx + num_regions; i++) {
assert(!_commit_map.at(i), "Trying to commit storage at region %u that is already committed", i);
size_t idx = region_idx_to_page_idx(i);
uint old_refcount = _refcounts.get_by_index(idx);
+
bool zero_filled = false;
if (old_refcount == 0) {
+ if (first_committed == NoPage) {
+ first_committed = idx;
+ num_committed = 1;
+ } else {
+ num_committed++;
+ }
zero_filled = _storage.commit(idx, 1);
}
+ all_zero_filled &= zero_filled;
+
_refcounts.set_by_index(idx, old_refcount + 1);
_commit_map.set_bit(i);
- fire_on_commit(i, 1, zero_filled);
}
+ if (AlwaysPreTouch && num_committed > 0) {
+ _storage.pretouch(first_committed, num_committed, pretouch_gang);
+ }
+ fire_on_commit(start_idx, num_regions, all_zero_filled);
}
virtual void uncommit_regions(uint start_idx, size_t num_regions) {