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7106024: CMS: Removed unused code for precleaning in remark phase

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Remove dead code.

Reviewed-by: stefank, ysr
This commit is contained in:
Jon Masamitsu 2011-11-22 14:18:39 -08:00
parent a3311881b5
commit 404bb0d0ac
3 changed files with 0 additions and 30 deletions
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10
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
View file

@ -3582,16 +3582,6 @@ void CMSCollector::checkpointRootsInitialWork(bool asynch) {
" or no bits are set in the gc_prologue before the start of the next " " or no bits are set in the gc_prologue before the start of the next "
"subsequent marking phase."); "subsequent marking phase.");
// Temporarily disabled, since pre/post-consumption closures don't
// care about precleaned cards
#if 0
{
MemRegion mr = MemRegion((HeapWord*)_virtual_space.low(),
(HeapWord*)_virtual_space.high());
_ct->ct_bs()->preclean_dirty_cards(mr);
}
#endif
// Save the end of the used_region of the constituent generations // Save the end of the used_region of the constituent generations
// to be used to limit the extent of sweep in each generation. // to be used to limit the extent of sweep in each generation.
save_sweep_limits(); save_sweep_limits();

17
hotspot/src/share/vm/memory/cardTableModRefBS.cpp
View file

@ -662,23 +662,6 @@ MemRegion CardTableModRefBS::dirty_card_range_after_reset(MemRegion mr,
return MemRegion(mr.end(), mr.end()); return MemRegion(mr.end(), mr.end());
} }
// Set all the dirty cards in the given region to "precleaned" state.
void CardTableModRefBS::preclean_dirty_cards(MemRegion mr) {
for (int i = 0; i < _cur_covered_regions; i++) {
MemRegion mri = mr.intersection(_covered[i]);
if (!mri.is_empty()) {
jbyte *cur_entry, *limit;
for (cur_entry = byte_for(mri.start()), limit = byte_for(mri.last());
cur_entry <= limit;
cur_entry++) {
if (*cur_entry == dirty_card) {
*cur_entry = precleaned_card;
}
}
}
}
}
uintx CardTableModRefBS::ct_max_alignment_constraint() { uintx CardTableModRefBS::ct_max_alignment_constraint() {
return card_size * os::vm_page_size(); return card_size * os::vm_page_size();
} }

3
hotspot/src/share/vm/memory/cardTableModRefBS.hpp
View file

@ -435,9 +435,6 @@ public:
MemRegion dirty_card_range_after_reset(MemRegion mr, bool reset, MemRegion dirty_card_range_after_reset(MemRegion mr, bool reset,
int reset_val); int reset_val);
// Set all the dirty cards in the given region to precleaned state.
void preclean_dirty_cards(MemRegion mr);
// Provide read-only access to the card table array. // Provide read-only access to the card table array.
const jbyte* byte_for_const(const void* p) const { const jbyte* byte_for_const(const void* p) const {
return byte_for(p); return byte_for(p);