archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 02:54:35 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

6720309: G1: don't synchronously update RSet during evacuation pauses

Browse source 
6720334: G1: don't update RSets of collection set regions during an evacuation pause

Introduced a deferred update mechanism for delaying the rset updates during the collection pause

Reviewed-by: apetrusenko, tonyp
This commit is contained in:
Igor Veresov 2009-03-06 13:50:14 -08:00
parent 72bfacbd95
commit 416d70bf91
13 changed files with 380 additions and 102 deletions
Download patch file Download diff file Expand all files Collapse all files

26
hotspot/src/share/vm/memory/cardTableModRefBS.hpp
View file

@ -52,11 +52,15 @@ class CardTableModRefBS: public ModRefBarrierSet {
enum CardValues {
clean_card = -1,
// The mask contains zeros in places for all other values.
clean_card_mask = clean_card - 31,
dirty_card = 0,
precleaned_card = 1,
claimed_card = 3,
last_card = 4,
CT_MR_BS_last_reserved = 10
claimed_card = 2,
deferred_card = 4,
last_card = 8,
CT_MR_BS_last_reserved = 16
};
// dirty and precleaned are equivalent wrt younger_refs_iter.
@ -254,9 +258,11 @@ public:
};
static int clean_card_val() { return clean_card; }
static int clean_card_mask_val() { return clean_card_mask; }
static int dirty_card_val() { return dirty_card; }
static int claimed_card_val() { return claimed_card; }
static int precleaned_card_val() { return precleaned_card; }
static int deferred_card_val() { return deferred_card; }
// For RTTI simulation.
bool is_a(BarrierSet::Name bsn) {
@ -329,7 +335,8 @@ public:
}
bool is_card_claimed(size_t card_index) {
return _byte_map[card_index] == claimed_card_val();
jbyte val = _byte_map[card_index];
return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val();
}
bool claim_card(size_t card_index);
@ -338,6 +345,13 @@ public:
return _byte_map[card_index] == clean_card_val();
}
bool is_card_deferred(size_t card_index) {
jbyte val = _byte_map[card_index];
return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val();
}
bool mark_card_deferred(size_t card_index);
// Card marking array base (adjusted for heap low boundary)
// This would be the 0th element of _byte_map, if the heap started at 0x0.
// But since the heap starts at some higher address, this points to somewhere
@ -434,6 +448,10 @@ public:
return byte_for(p) - _byte_map;
}
const jbyte* byte_for_index(const size_t card_index) const {
return _byte_map + card_index;
}
void verify();
void verify_guard();