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8022800: Use specific generations rather than generation iteration

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Reviewed-by: jmasa, ehelin
This commit is contained in:
Bengt Rutisson 2013-08-14 09:02:32 +02:00
parent 7cea3820af
commit 19ba466575
8 changed files with 41 additions and 80 deletions
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34
hotspot/src/share/vm/memory/cardTableRS.cpp
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@ -321,35 +321,25 @@ void CardTableRS::clear_into_younger(Generation* gen) {
// below to avoid missing cards at the fringes. If clear() or
// invalidate() are changed in the future, this code should
// be revisited. 20040107.ysr
Generation* g = gen;
for(Generation* prev_gen = gch->prev_gen(g);
prev_gen != NULL;
g = prev_gen, prev_gen = gch->prev_gen(g)) {
MemRegion to_be_cleared_mr = g->prev_used_region();
clear(to_be_cleared_mr);
}
Generation* old_gen = gen;
clear(old_gen->prev_used_region());
Generation* young_gen = gch->prev_gen(old_gen);
clear(young_gen->prev_used_region());
}
void CardTableRS::invalidate_or_clear(Generation* gen, bool younger) {
GenCollectedHeap* gch = GenCollectedHeap::heap();
// For each generation gen (and younger)
// invalidate the cards for the currently occupied part
// of that generation and clear the cards for the
void CardTableRS::invalidate_or_clear(Generation* gen) {
// For generation gen invalidate the cards for the currently
// occupied part of that generation and clear the cards for the
// unoccupied part of the generation (if any, making use
// of that generation's prev_used_region to determine that
// region). No need to do anything for the youngest
// generation. Also see note#20040107.ysr above.
Generation* g = gen;
for(Generation* prev_gen = gch->prev_gen(g); prev_gen != NULL;
g = prev_gen, prev_gen = gch->prev_gen(g)) {
MemRegion used_mr = g->used_region();
MemRegion to_be_cleared_mr = g->prev_used_region().minus(used_mr);
if (!to_be_cleared_mr.is_empty()) {
clear(to_be_cleared_mr);
}
invalidate(used_mr);
if (!younger) break;
MemRegion used_mr = gen->used_region();
MemRegion to_be_cleared_mr = gen->prev_used_region().minus(used_mr);
if (!to_be_cleared_mr.is_empty()) {
clear(to_be_cleared_mr);
}
invalidate(used_mr);
}