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src/share/vm/memory/tenuredGeneration.cpp
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rev 7420 : [mq]: removeOneContigSpaceGeneration
@@ -22,26 +22,27 @@
*
*/
#include "precompiled.hpp"
#include "gc_implementation/shared/collectorCounters.hpp"
+#include "gc_implementation/shared/gcTimer.hpp"
#include "gc_implementation/shared/parGCAllocBuffer.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/blockOffsetTable.inline.hpp"
-#include "memory/generation.inline.hpp"
#include "memory/generationSpec.hpp"
+#include "memory/genMarkSweep.hpp"
+#include "memory/genOopClosures.inline.hpp"
#include "memory/space.hpp"
-#include "memory/tenuredGeneration.hpp"
+#include "memory/tenuredGeneration.inline.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/java.hpp"
#include "utilities/macros.hpp"
TenuredGeneration::TenuredGeneration(ReservedSpace rs,
size_t initial_byte_size, int level,
GenRemSet* remset) :
- OneContigSpaceCardGeneration(rs, initial_byte_size,
- level, remset, NULL)
+ CardGeneration(rs, initial_byte_size, level, remset)
{
HeapWord* bottom = (HeapWord*) _virtual_space.low();
HeapWord* end = (HeapWord*) _virtual_space.high();
_the_space = new TenuredSpace(_bts, MemRegion(bottom, end));
_the_space->reset_saved_mark();
@@ -168,5 +169,246 @@
res? "":" not", available, res? ">=":"<",
av_promo, max_promotion_in_bytes);
}
return res;
}
+
+void TenuredGeneration::collect(bool full,
+ bool clear_all_soft_refs,
+ size_t size,
+ bool is_tlab) {
+ GenCollectedHeap* gch = GenCollectedHeap::heap();
+
+ SpecializationStats::clear();
+ // Temporarily expand the span of our ref processor, so
+ // refs discovery is over the entire heap, not just this generation
+ ReferenceProcessorSpanMutator
+ x(ref_processor(), gch->reserved_region());
+
+ STWGCTimer* gc_timer = GenMarkSweep::gc_timer();
+ gc_timer->register_gc_start();
+
+ SerialOldTracer* gc_tracer = GenMarkSweep::gc_tracer();
+ gc_tracer->report_gc_start(gch->gc_cause(), gc_timer->gc_start());
+
+ GenMarkSweep::invoke_at_safepoint(_level, ref_processor(), clear_all_soft_refs);
+
+ gc_timer->register_gc_end();
+
+ gc_tracer->report_gc_end(gc_timer->gc_end(), gc_timer->time_partitions());
+
+ SpecializationStats::print();
+}
+
+HeapWord*
+TenuredGeneration::expand_and_allocate(size_t word_size,
+ bool is_tlab,
+ bool parallel) {
+ assert(!is_tlab, "TenuredGeneration does not support TLAB allocation");
+ if (parallel) {
+ MutexLocker x(ParGCRareEvent_lock);
+ HeapWord* result = NULL;
+ size_t byte_size = word_size * HeapWordSize;
+ while (true) {
+ expand(byte_size, _min_heap_delta_bytes);
+ if (GCExpandToAllocateDelayMillis > 0) {
+ os::sleep(Thread::current(), GCExpandToAllocateDelayMillis, false);
+ }
+ result = _the_space->par_allocate(word_size);
+ if ( result != NULL) {
+ return result;
+ } else {
+ // If there's not enough expansion space available, give up.
+ if (_virtual_space.uncommitted_size() < byte_size) {
+ return NULL;
+ }
+ // else try again
+ }
+ }
+ } else {
+ expand(word_size*HeapWordSize, _min_heap_delta_bytes);
+ return _the_space->allocate(word_size);
+ }
+}
+
+bool TenuredGeneration::expand(size_t bytes, size_t expand_bytes) {
+ GCMutexLocker x(ExpandHeap_lock);
+ return CardGeneration::expand(bytes, expand_bytes);
+}
+
+
+void TenuredGeneration::shrink(size_t bytes) {
+ assert_locked_or_safepoint(ExpandHeap_lock);
+ size_t size = ReservedSpace::page_align_size_down(bytes);
+ if (size > 0) {
+ shrink_by(size);
+ }
+}
+
+
+size_t TenuredGeneration::capacity() const {
+ return _the_space->capacity();
+}
+
+
+size_t TenuredGeneration::used() const {
+ return _the_space->used();
+}
+
+
+size_t TenuredGeneration::free() const {
+ return _the_space->free();
+}
+
+MemRegion TenuredGeneration::used_region() const {
+ return the_space()->used_region();
+}
+
+size_t TenuredGeneration::unsafe_max_alloc_nogc() const {
+ return _the_space->free();
+}
+
+size_t TenuredGeneration::contiguous_available() const {
+ return _the_space->free() + _virtual_space.uncommitted_size();
+}
+
+bool TenuredGeneration::grow_by(size_t bytes) {
+ assert_locked_or_safepoint(ExpandHeap_lock);
+ bool result = _virtual_space.expand_by(bytes);
+ if (result) {
+ size_t new_word_size =
+ heap_word_size(_virtual_space.committed_size());
+ MemRegion mr(_the_space->bottom(), new_word_size);
+ // Expand card table
+ Universe::heap()->barrier_set()->resize_covered_region(mr);
+ // Expand shared block offset array
+ _bts->resize(new_word_size);
+
+ // Fix for bug #4668531
+ if (ZapUnusedHeapArea) {
+ MemRegion mangle_region(_the_space->end(),
+ (HeapWord*)_virtual_space.high());
+ SpaceMangler::mangle_region(mangle_region);
+ }
+
+ // Expand space -- also expands space's BOT
+ // (which uses (part of) shared array above)
+ _the_space->set_end((HeapWord*)_virtual_space.high());
+
+ // update the space and generation capacity counters
+ update_counters();
+
+ if (Verbose && PrintGC) {
+ size_t new_mem_size = _virtual_space.committed_size();
+ size_t old_mem_size = new_mem_size - bytes;
+ gclog_or_tty->print_cr("Expanding %s from " SIZE_FORMAT "K by "
+ SIZE_FORMAT "K to " SIZE_FORMAT "K",
+ name(), old_mem_size/K, bytes/K, new_mem_size/K);
+ }
+ }
+ return result;
+}
+
+
+bool TenuredGeneration::grow_to_reserved() {
+ assert_locked_or_safepoint(ExpandHeap_lock);
+ bool success = true;
+ const size_t remaining_bytes = _virtual_space.uncommitted_size();
+ if (remaining_bytes > 0) {
+ success = grow_by(remaining_bytes);
+ DEBUG_ONLY(if (!success) warning("grow to reserved failed");)
+ }
+ return success;
+}
+
+void TenuredGeneration::shrink_by(size_t bytes) {
+ assert_locked_or_safepoint(ExpandHeap_lock);
+ // Shrink committed space
+ _virtual_space.shrink_by(bytes);
+ // Shrink space; this also shrinks the space's BOT
+ _the_space->set_end((HeapWord*) _virtual_space.high());
+ size_t new_word_size = heap_word_size(_the_space->capacity());
+ // Shrink the shared block offset array
+ _bts->resize(new_word_size);
+ MemRegion mr(_the_space->bottom(), new_word_size);
+ // Shrink the card table
+ Universe::heap()->barrier_set()->resize_covered_region(mr);
+
+ if (Verbose && PrintGC) {
+ size_t new_mem_size = _virtual_space.committed_size();
+ size_t old_mem_size = new_mem_size + bytes;
+ gclog_or_tty->print_cr("Shrinking %s from " SIZE_FORMAT "K to " SIZE_FORMAT "K",
+ name(), old_mem_size/K, new_mem_size/K);
+ }
+}
+
+// Currently nothing to do.
+void TenuredGeneration::prepare_for_verify() {}
+
+void TenuredGeneration::object_iterate(ObjectClosure* blk) {
+ _the_space->object_iterate(blk);
+}
+
+void TenuredGeneration::space_iterate(SpaceClosure* blk,
+ bool usedOnly) {
+ blk->do_space(_the_space);
+}
+
+void TenuredGeneration::younger_refs_iterate(OopsInGenClosure* blk) {
+ blk->set_generation(this);
+ younger_refs_in_space_iterate(_the_space, blk);
+ blk->reset_generation();
+}
+
+void TenuredGeneration::save_marks() {
+ _the_space->set_saved_mark();
+}
+
+
+void TenuredGeneration::reset_saved_marks() {
+ _the_space->reset_saved_mark();
+}
+
+
+bool TenuredGeneration::no_allocs_since_save_marks() {
+ return _the_space->saved_mark_at_top();
+}
+
+#define TenuredGen_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \
+ \
+void TenuredGeneration:: \
+oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk) { \
+ blk->set_generation(this); \
+ _the_space->oop_since_save_marks_iterate##nv_suffix(blk); \
+ blk->reset_generation(); \
+ save_marks(); \
+}
+
+ALL_SINCE_SAVE_MARKS_CLOSURES(TenuredGen_SINCE_SAVE_MARKS_ITERATE_DEFN)
+
+#undef TenuredGen_SINCE_SAVE_MARKS_ITERATE_DEFN
+
+
+void TenuredGeneration::gc_epilogue(bool full) {
+ _last_gc = WaterMark(the_space(), the_space()->top());
+
+ // update the generation and space performance counters
+ update_counters();
+ if (ZapUnusedHeapArea) {
+ the_space()->check_mangled_unused_area_complete();
+ }
+}
+
+void TenuredGeneration::record_spaces_top() {
+ assert(ZapUnusedHeapArea, "Not mangling unused space");
+ the_space()->set_top_for_allocations();
+}
+
+void TenuredGeneration::verify() {
+ the_space()->verify();
+}
+
+void TenuredGeneration::print_on(outputStream* st) const {
+ Generation::print_on(st);
+ st->print(" the");
+ the_space()->print_on(st);
+}
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