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changeset 10832:49dcf5b44dcb

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8231209: [REDO] ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread Summary: Add com.sun.management.getCurrentThreadAllocatedBytes, implement getThreadAllocatedBytes(long) independent of getThreadAllocatedBytes(long[]) Reviewed-by: mchung, dholmes, sspitsyn
author phh
date Wed, 25 Sep 2019 15:22:33 -0700
parents 04b1e9e7509d
children 0277358b8fc2
files src/share/vm/services/jmm.h src/share/vm/services/management.cpp
diffstat 2 files changed, 31 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/services/jmm.h	Thu Sep 24 13:19:11 2020 +0200
+++ b/src/share/vm/services/jmm.h	Wed Sep 25 15:22:33 2019 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -219,7 +219,9 @@
 
 typedef struct jmmInterface_1_ {
   void*        reserved1;
-  void*        reserved2;
+  jlong        (JNICALL *GetOneThreadAllocatedMemory)
+                                                 (JNIEnv *env,
+                                                  jlong thread_id);
 
   jint         (JNICALL *GetVersion)             (JNIEnv *env);
 
--- a/src/share/vm/services/management.cpp	Thu Sep 24 13:19:11 2020 +0200
+++ b/src/share/vm/services/management.cpp	Wed Sep 25 15:22:33 2019 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2232,6 +2232,31 @@
 }
 #endif // INCLUDE_MANAGEMENT
 
+// Gets the amount of memory allocated on the Java heap for a single thread.
+// Returns -1 if the thread does not exist or has terminated.
+JVM_ENTRY(jlong, jmm_GetOneThreadAllocatedMemory(JNIEnv *env, jlong thread_id))
+  if (thread_id < 0) {
+    THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
+               "Invalid thread ID", -1);
+  }
+
+  if (thread_id == 0) {
+    // current thread
+    if (THREAD->is_Java_thread()) {
+      return ((JavaThread*)THREAD)->cooked_allocated_bytes();
+    }
+    return -1;
+  }
+
+  MutexLockerEx ml(Threads_lock);
+  JavaThread* java_thread = Threads::find_java_thread_from_java_tid(thread_id);
+
+  if (java_thread != NULL) {
+    return java_thread->cooked_allocated_bytes();
+  }
+  return -1;
+JVM_END
+
 // Gets an array containing the amount of memory allocated on the Java
 // heap for a set of threads (in bytes).  Each element of the array is
 // the amount of memory allocated for the thread ID specified in the
@@ -2348,7 +2373,7 @@
 #if INCLUDE_MANAGEMENT
 const struct jmmInterface_1_ jmm_interface = {
   NULL,
-  NULL,
+  jmm_GetOneThreadAllocatedMemory,
   jmm_GetVersion,
   jmm_GetOptionalSupport,
   jmm_GetInputArguments,