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8053995: Add method to WhiteBox to get vm pagesize

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Unsafe is not recommended and may deprecated in future. Added a WhiteBox API to get VM page size.

Reviewed-by: dholmes, ccheung, mseledtsov
This commit is contained in:
Yumin Qi 2014-11-26 10:32:21 -08:00 • committed by Yumin Qi
parent 5ffd65a731
commit d620b54c63
3 changed files with 51 additions and 0 deletions
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4
hotspot/src/share/vm/prims/whitebox.cpp
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@ -82,6 +82,9 @@ WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
return heapOopSize;
WB_END
WB_ENTRY(jint, WB_GetVMPageSize(JNIEnv* env, jobject o))
return os::vm_page_size();
WB_END
class WBIsKlassAliveClosure : public KlassClosure {
Symbol* _name;
@ -1121,6 +1124,7 @@ static JNINativeMethod methods[] = {
{CC"getObjectSize", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize },
{CC"isObjectInOldGen", CC"(Ljava/lang/Object;)Z", (void*)&WB_isObjectInOldGen },
{CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
{CC"getVMPageSize", CC"()I", (void*)&WB_GetVMPageSize },
{CC"isClassAlive0", CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive },
{CC"parseCommandLine",
CC"(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",