Mercurial > hg > graal-compiler

changeset 22015:7645c463fb65

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
only make VM or native calls if the result will actually be used
author Doug Simon <doug.simon@oracle.com>
date Tue, 16 Jun 2015 23:11:26 +0200
parents 35b153c26783
children f2cf8824040b
files jvmci/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/CompilationTask.java
diffstat 1 files changed, 18 insertions(+), 9 deletions(-) [+]
line wrap: on
line diff
--- a/jvmci/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/CompilationTask.java	Wed Apr 29 12:23:48 2015 -0700
+++ b/jvmci/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/CompilationTask.java	Tue Jun 16 23:11:26 2015 +0200
@@ -66,11 +66,13 @@
      */
     private final boolean installAsDefault;
 
-    /**
-     * A {@link com.sun.management.ThreadMXBean} to be able to query some information about the
-     * current compiler thread, e.g. total allocated bytes.
-     */
-    private static final com.sun.management.ThreadMXBean threadMXBean = (com.sun.management.ThreadMXBean) Management.getThreadMXBean();
+    static class Lazy {
+        /**
+         * A {@link com.sun.management.ThreadMXBean} to be able to query some information about the
+         * current compiler thread, e.g. total allocated bytes.
+         */
+        static final com.sun.management.ThreadMXBean threadMXBean = (com.sun.management.ThreadMXBean) Management.getThreadMXBean();
+    }
 
     /**
      * The address of the JVMCIEnv associated with this compilation or 0L if no such object exists.
@@ -135,13 +137,21 @@
         try (DebugCloseable a = CompilationTime.start()) {
             CompilationStatistics stats = CompilationStatistics.create(method, isOSR);
             final boolean printCompilation = PrintCompilation.getValue() && !TTY.isSuppressed();
+            final boolean printAfterCompilation = PrintAfterCompilation.getValue() && !TTY.isSuppressed();
             if (printCompilation) {
                 TTY.println(getMethodDescription() + "...");
             }
 
             TTY.Filter filter = new TTY.Filter(PrintFilter.getValue(), method);
-            final long start = System.currentTimeMillis();
-            final long allocatedBytesBefore = threadMXBean.getThreadAllocatedBytes(threadId);
+            final long start;
+            final long allocatedBytesBefore;
+            if (printAfterCompilation || printCompilation) {
+                start = System.currentTimeMillis();
+                allocatedBytesBefore = printAfterCompilation || printCompilation ? Lazy.threadMXBean.getThreadAllocatedBytes(threadId) : 0L;
+            } else {
+                start = 0L;
+                allocatedBytesBefore = 0L;
+            }
 
             try (Scope s = Debug.scope("Compiling", new DebugDumpScope(String.valueOf(id), true))) {
                 // Begin the compilation event.
@@ -157,12 +167,11 @@
                 compilationEvent.end();
 
                 filter.remove();
-                final boolean printAfterCompilation = PrintAfterCompilation.getValue() && !TTY.isSuppressed();
 
                 if (printAfterCompilation || printCompilation) {
                     final long stop = System.currentTimeMillis();
                     final int targetCodeSize = result != null ? result.getTargetCodeSize() : -1;
-                    final long allocatedBytesAfter = threadMXBean.getThreadAllocatedBytes(threadId);
+                    final long allocatedBytesAfter = Lazy.threadMXBean.getThreadAllocatedBytes(threadId);
                     final long allocatedBytes = (allocatedBytesAfter - allocatedBytesBefore) / 1024;
 
                     if (printAfterCompilation) {