graal-compiler: src/share/vm/gc_implementation/g1/heapRegionSet.cpp comparison

comparison src/share/vm/gc_implementation/g1/heapRegionSet.cpp @ 17737:0d2ce7411240

8037407: G1: Remove heapRegionSets.cpp Reviewed-by: tschatzl, pliden

author	brutisso
date	Mon, 17 Mar 2014 13:42:16 +0100
parents	58fc1b1523dc
children	8ee855b4e667

comparison

equal deleted inserted replaced

-:58fc1b1523dc
+:0d2ce7411240
 HeapRegion* hr = iter.get_next();
 hr->print_on(out);
 }
 }
 }
+void FreeRegionList::verify_list() {
+HeapRegion* curr = head();
+HeapRegion* prev1 = NULL;
+HeapRegion* prev0 = NULL;
+uint count = 0;
+size_t capacity = 0;
+while (curr != NULL) {
+verify_region(curr);
+count++;
+guarantee(count < _unrealistically_long_length,
+hrs_err_msg("[%s] the calculated length: %u seems very long, is there maybe a cycle? curr: "PTR_FORMAT" prev0: "PTR_FORMAT" " "prev1: "PTR_FORMAT" length: %u", name(), count, curr, prev0, prev1, length()));
+capacity += curr->capacity();
+prev1 = prev0;
+prev0 = curr;
+curr = curr->next();
+}
+guarantee(tail() == prev0, err_msg("Expected %s to end with %u but it ended with %u.", name(), tail()->hrs_index(), prev0->hrs_index()));
+guarantee(length() == count, err_msg("%s count mismatch. Expected %u, actual %u.", name(), length(), count));
+guarantee(total_capacity_bytes() == capacity, err_msg("%s capacity mismatch. Expected " SIZE_FORMAT ", actual " SIZE_FORMAT,
+name(), total_capacity_bytes(), capacity));
+}
+// Note on the check_mt_safety() methods below:
+//
+// Verification of the "master" heap region sets / lists that are
+// maintained by G1CollectedHeap is always done during a STW pause and
+// by the VM thread at the start / end of the pause. The standard
+// verification methods all assert check_mt_safety(). This is
+// important as it ensures that verification is done without
+// concurrent updates taking place at the same time. It follows, that,
+// for the "master" heap region sets / lists, the check_mt_safety()
+// method should include the VM thread / STW case.
+void MasterFreeRegionListMtSafeChecker::check() {
+// Master Free List MT safety protocol:
+// (a) If we're at a safepoint, operations on the master free list
+// should be invoked by either the VM thread (which will serialize
+// them) or by the GC workers while holding the
+// FreeList_lock.
+// (b) If we're not at a safepoint, operations on the master free
+// list should be invoked while holding the Heap_lock.
+if (SafepointSynchronize::is_at_safepoint()) {
+guarantee(Thread::current()->is_VM_thread() ||
+FreeList_lock->owned_by_self(), "master free list MT safety protocol at a safepoint");
+} else {
+guarantee(Heap_lock->owned_by_self(), "master free list MT safety protocol outside a safepoint");
+}
+}
+void SecondaryFreeRegionListMtSafeChecker::check() {
+// Secondary Free List MT safety protocol:
+// Operations on the secondary free list should always be invoked
+// while holding the SecondaryFreeList_lock.
+guarantee(SecondaryFreeList_lock->owned_by_self(), "secondary free list MT safety protocol");
+}
+void OldRegionSetMtSafeChecker::check() {
+// Master Old Set MT safety protocol:
+// (a) If we're at a safepoint, operations on the master old set
+// should be invoked:
+// - by the VM thread (which will serialize them), or
+// - by the GC workers while holding the FreeList_lock, if we're
+//   at a safepoint for an evacuation pause (this lock is taken
+//   anyway when an GC alloc region is retired so that a new one
+//   is allocated from the free list), or
+// - by the GC workers while holding the OldSets_lock, if we're at a
+//   safepoint for a cleanup pause.
+// (b) If we're not at a safepoint, operations on the master old set
+// should be invoked while holding the Heap_lock.
+if (SafepointSynchronize::is_at_safepoint()) {
+guarantee(Thread::current()->is_VM_thread()
+|| FreeList_lock->owned_by_self() || OldSets_lock->owned_by_self(),
+"master old set MT safety protocol at a safepoint");
+} else {
+guarantee(Heap_lock->owned_by_self(), "master old set MT safety protocol outside a safepoint");
+}
+}
+void HumongousRegionSetMtSafeChecker::check() {
+// Humongous Set MT safety protocol:
+// (a) If we're at a safepoint, operations on the master humongous
+// set should be invoked by either the VM thread (which will
+// serialize them) or by the GC workers while holding the
+// OldSets_lock.
+// (b) If we're not at a safepoint, operations on the master
+// humongous set should be invoked while holding the Heap_lock.
+if (SafepointSynchronize::is_at_safepoint()) {
+guarantee(Thread::current()->is_VM_thread() ||
+OldSets_lock->owned_by_self(),
+"master humongous set MT safety protocol at a safepoint");
+} else {
+guarantee(Heap_lock->owned_by_self(),
+"master humongous set MT safety protocol outside a safepoint");
+}
+}

Mercurial > hg > graal-compiler

comparison src/share/vm/gc_implementation/g1/heapRegionSet.cpp @ 17737:0d2ce7411240