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6543938: G1: remove the concept of popularity

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Reviewed-by: iveresov, tonyp
This commit is contained in:
Andrey Petrusenko 2009-03-25 13:10:54 -07:00
parent cb822b7e10
commit cf2ae8d98d
19 changed files with 101 additions and 1074 deletions
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46
hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp
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@ -188,32 +188,6 @@ private:
// the _outgoing_region_map.
void clear_outgoing_entries();
#if MAYBE
// Audit the given card index.
void audit_card(size_t card_num, HeapRegion* hr, u2* rc_arr,
HeapRegionRemSet* empty_cards, size_t* one_obj_cards);
// Assumes that "audit_stage1" has been called for "hr", to set up
// "shadow" and "new_rs" appropriately. Identifies individual popular
// objects; returns "true" if any are found.
bool audit_find_pop(HeapRegion* hr, u2* rc_arr);
// Assumes that "audit_stage1" has been called for "hr", to set up
// "shadow" and "new_rs" appropriately. Identifies individual popular
// objects, and determines the number of entries in "new_rs" if any such
// popular objects are ignored. If this is sufficiently small, returns
// "false" to indicate that a constraint should not be introduced.
// Otherwise, returns "true" to indicate that we should go ahead with
// adding the constraint.
bool audit_stag(HeapRegion* hr, u2* rc_arr);
u2* alloc_rc_array();
SeqHeapRegionRemSet* audit_post(u2* rc_arr, size_t multi_obj_crds,
SeqHeapRegionRemSet* empty_cards);
#endif
enum ParIterState { Unclaimed, Claimed, Complete };
ParIterState _iter_state;
@ -261,16 +235,14 @@ public:
/* Used in the sequential case. Returns "true" iff this addition causes
the size limit to be reached. */
bool add_reference(oop* from) {
void add_reference(oop* from) {
_other_regions.add_reference(from);
return false;
}
/* Used in the parallel case. Returns "true" iff this addition causes
the size limit to be reached. */
bool add_reference(oop* from, int tid) {
void add_reference(oop* from, int tid) {
_other_regions.add_reference(from, tid);
return false;
}
// Records the fact that the current region contains an outgoing
@ -338,20 +310,6 @@ public:
}
void print() const;
#if MAYBE
// We are about to introduce a constraint, requiring the collection time
// of the region owning this RS to be <= "hr", and forgetting pointers
// from the owning region to "hr." Before doing so, examines this rem
// set for pointers to "hr", possibly identifying some popular objects.,
// and possibly finding some cards to no longer contain pointers to "hr",
//
// These steps may prevent the the constraint from being necessary; in
// which case returns a set of cards now thought to contain no pointers
// into HR. In the normal (I assume) case, returns NULL, indicating that
// we should go ahead and add the constraint.
virtual SeqHeapRegionRemSet* audit(HeapRegion* hr) = 0;
#endif
// Called during a stop-world phase to perform any deferred cleanups.
// The second version may be called by parallel threads after then finish
// collection work.