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8135200: Add White Box method that enumerates G1 old regions with less than specified liveness and collects statistics

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Reviewed-by: tschatzl, dfazunen, iignatyev
This commit is contained in:
Kirill Zhaldybin 2016-04-20 19:54:51 +03:00
parent c66b2de971
commit 4ba6969ac6
1 changed files with 64 additions and 0 deletions
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64
hotspot/src/share/vm/prims/whitebox.cpp
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@ -38,6 +38,7 @@
#include "memory/iterator.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "memory/oopFactory.hpp"
#include "oops/constantPool.hpp"
#include "oops/oop.inline.hpp"
#include "prims/wbtestmethods/parserTests.hpp"
@ -374,6 +375,68 @@ WB_ENTRY(jobject, WB_G1AuxiliaryMemoryUsage(JNIEnv* env))
Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
return JNIHandles::make_local(env, h());
WB_END
class OldRegionsLivenessClosure: public HeapRegionClosure {
private:
const int _liveness;
size_t _total_count;
size_t _total_memory;
size_t _total_memory_to_free;
public:
OldRegionsLivenessClosure(int liveness) :
_liveness(liveness),
_total_count(0),
_total_memory(0),
_total_memory_to_free(0) { }
size_t total_count() { return _total_count; }
size_t total_memory() { return _total_memory; }
size_t total_memory_to_free() { return _total_memory_to_free; }
bool doHeapRegion(HeapRegion* r) {
if (r->is_old()) {
size_t prev_live = r->marked_bytes();
size_t live = r->live_bytes();
size_t size = r->used();
size_t reg_size = HeapRegion::GrainBytes;
if (size > 0 && ((int)(live * 100 / size) < _liveness)) {
_total_memory += size;
++_total_count;
if (size == reg_size) {
// we don't include non-full regions since they are unlikely included in mixed gc
// for testing purposes it's enough to have lowest estimation of total memory that is expected to be freed
_total_memory_to_free += size - prev_live;
}
}
}
return false;
}
};
WB_ENTRY(jlongArray, WB_G1GetMixedGCInfo(JNIEnv* env, jobject o, jint liveness))
if (!UseG1GC) {
THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "WB_G1GetMixedGCInfo: G1 is not enabled");
}
if (liveness < 0) {
THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "liveness value should be non-negative");
}
G1CollectedHeap* g1h = G1CollectedHeap::heap();
OldRegionsLivenessClosure rli(liveness);
g1h->heap_region_iterate(&rli);
typeArrayOop result = oopFactory::new_longArray(3, CHECK_NULL);
result->long_at_put(0, rli.total_count());
result->long_at_put(1, rli.total_memory());
result->long_at_put(2, rli.total_memory_to_free());
return (jlongArray) JNIHandles::make_local(env, result);
WB_END
#endif // INCLUDE_ALL_GCS
#if INCLUDE_NMT
@ -1601,6 +1664,7 @@ static JNINativeMethod methods[] = {
(void*)&WB_G1AuxiliaryMemoryUsage },
{CC"psVirtualSpaceAlignment",CC"()J", (void*)&WB_PSVirtualSpaceAlignment},
{CC"psHeapGenerationAlignment",CC"()J", (void*)&WB_PSHeapGenerationAlignment},
{CC"g1GetMixedGCInfo", CC"(I)[J", (void*)&WB_G1GetMixedGCInfo },
#endif // INCLUDE_ALL_GCS
#if INCLUDE_NMT
{CC"NMTMalloc", CC"(J)J", (void*)&WB_NMTMalloc },