8024650: Don't adjust MaxMetaspaceSize up to MetaspaceSize

Reviewed-by: jwilhelm, brutisso, tschatzl

hotspot/src/share/vm/gc_implementation/parallelScavenge/generationSizer.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2013, 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
@@ -68,9 +68,6 @@ class GenerationSizer : public TwoGenerationCollectorPolicy {
   size_t min_old_gen_size()   { return _min_gen1_size; }
   size_t old_gen_size()       { return _initial_gen1_size; }
   size_t max_old_gen_size()   { return _max_gen1_size; }
-
-  size_t metaspace_size()      { return MetaspaceSize; }
-  size_t max_metaspace_size()  { return MaxMetaspaceSize; }
 };
 
 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_GENERATIONSIZER_HPP

hotspot/src/share/vm/memory/collectorPolicy.cpp

@@ -47,6 +47,11 @@
 
 // CollectorPolicy methods.
 
+// Align down. If the aligning result in 0, return 'alignment'.
+static size_t restricted_align_down(size_t size, size_t alignment) {
+  return MAX2(alignment, align_size_down_(size, alignment));
+}
+
 void CollectorPolicy::initialize_flags() {
   assert(max_alignment() >= min_alignment(),
       err_msg("max_alignment: " SIZE_FORMAT " less than min_alignment: " SIZE_FORMAT,
@@ -59,18 +64,24 @@ void CollectorPolicy::initialize_flags() {
     vm_exit_during_initialization("Incompatible initial and maximum heap sizes specified");
   }
 
-  if (MetaspaceSize > MaxMetaspaceSize) {
-    MaxMetaspaceSize = MetaspaceSize;
-  }
-  MetaspaceSize = MAX2(min_alignment(), align_size_down_(MetaspaceSize, min_alignment()));
-  // Don't increase Metaspace size limit above specified.
-  MaxMetaspaceSize = align_size_down(MaxMetaspaceSize, max_alignment());
-  if (MetaspaceSize > MaxMetaspaceSize) {
-    MetaspaceSize = MaxMetaspaceSize;
+  if (!is_size_aligned(MaxMetaspaceSize, max_alignment())) {
+    FLAG_SET_ERGO(uintx, MaxMetaspaceSize,
+        restricted_align_down(MaxMetaspaceSize, max_alignment()));
   }
 
-  MinMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MinMetaspaceExpansion, min_alignment()));
-  MaxMetaspaceExpansion = MAX2(min_alignment(), align_size_down_(MaxMetaspaceExpansion, min_alignment()));
+  if (MetaspaceSize > MaxMetaspaceSize) {
+    FLAG_SET_ERGO(uintx, MetaspaceSize, MaxMetaspaceSize);
+  }
+
+  if (!is_size_aligned(MetaspaceSize, min_alignment())) {
+    FLAG_SET_ERGO(uintx, MetaspaceSize,
+        restricted_align_down(MetaspaceSize, min_alignment()));
+  }
+
+  assert(MetaspaceSize <= MaxMetaspaceSize, "Must be");
+
+  MinMetaspaceExpansion = restricted_align_down(MinMetaspaceExpansion, min_alignment());
+  MaxMetaspaceExpansion = restricted_align_down(MaxMetaspaceExpansion, min_alignment());
 
   MinHeapDeltaBytes = align_size_up(MinHeapDeltaBytes, min_alignment());
 

hotspot/test/gc/metaspace/TestMetaspaceSizeFlags.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2013, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import com.oracle.java.testlibrary.Asserts;
+import com.oracle.java.testlibrary.OutputAnalyzer;
+import com.oracle.java.testlibrary.ProcessTools;
+
+/*
+ * @test TestMetaspaceSizeFlags
+ * @key gc
+ * @bug 8024650
+ * @summary Test that metaspace size flags can be set correctly
+ * @library /testlibrary
+ */
+public class TestMetaspaceSizeFlags {
+  public static final long K = 1024L;
+  public static final long M = 1024L * K;
+
+  // HotSpot uses a number of different values to align memory size flags.
+  // This is currently the largest alignment (unless huge large pages are used).
+  public static final long MAX_ALIGNMENT = 32 * M;
+
+  public static void main(String [] args) throws Exception {
+    testMaxMetaspaceSizeEQMetaspaceSize(MAX_ALIGNMENT, MAX_ALIGNMENT);
+    // 8024650: MaxMetaspaceSize was adjusted instead of MetaspaceSize.
+    testMaxMetaspaceSizeLTMetaspaceSize(MAX_ALIGNMENT, MAX_ALIGNMENT * 2);
+    testMaxMetaspaceSizeGTMetaspaceSize(MAX_ALIGNMENT * 2, MAX_ALIGNMENT);
+    testTooSmallInitialMetaspace(0, 0);
+    testTooSmallInitialMetaspace(0, MAX_ALIGNMENT);
+    testTooSmallInitialMetaspace(MAX_ALIGNMENT, 0);
+  }
+
+  private static void testMaxMetaspaceSizeEQMetaspaceSize(long maxMetaspaceSize, long metaspaceSize) throws Exception {
+    MetaspaceFlags mf = runAndGetValue(maxMetaspaceSize, metaspaceSize);
+    Asserts.assertEQ(maxMetaspaceSize, metaspaceSize);
+    Asserts.assertEQ(mf.maxMetaspaceSize, maxMetaspaceSize);
+    Asserts.assertEQ(mf.metaspaceSize, metaspaceSize);
+  }
+
+  private static void testMaxMetaspaceSizeLTMetaspaceSize(long maxMetaspaceSize, long metaspaceSize) throws Exception {
+    MetaspaceFlags mf = runAndGetValue(maxMetaspaceSize, metaspaceSize);
+    Asserts.assertEQ(mf.maxMetaspaceSize, maxMetaspaceSize);
+    Asserts.assertEQ(mf.metaspaceSize, maxMetaspaceSize);
+  }
+
+  private static void testMaxMetaspaceSizeGTMetaspaceSize(long maxMetaspaceSize, long metaspaceSize) throws Exception {
+    MetaspaceFlags mf = runAndGetValue(maxMetaspaceSize, metaspaceSize);
+    Asserts.assertGT(maxMetaspaceSize, metaspaceSize);
+    Asserts.assertGT(mf.maxMetaspaceSize, mf.metaspaceSize);
+    Asserts.assertEQ(mf.maxMetaspaceSize, maxMetaspaceSize);
+    Asserts.assertEQ(mf.metaspaceSize, metaspaceSize);
+  }
+
+  private static void testTooSmallInitialMetaspace(long maxMetaspaceSize, long metaspaceSize) throws Exception {
+    OutputAnalyzer output = run(maxMetaspaceSize, metaspaceSize);
+    output.shouldContain("Too small initial Metaspace size");
+  }
+
+  private static MetaspaceFlags runAndGetValue(long maxMetaspaceSize, long metaspaceSize) throws Exception {
+    OutputAnalyzer output = run(maxMetaspaceSize, metaspaceSize);
+    output.shouldNotMatch("Error occurred during initialization of VM\n.*");
+
+    String stringMaxMetaspaceSize = output.firstMatch(".* MaxMetaspaceSize .* := (\\d+).*", 1);
+    String stringMetaspaceSize = output.firstMatch(".* MetaspaceSize .* := (\\d+).*", 1);
+
+    return new MetaspaceFlags(Long.parseLong(stringMaxMetaspaceSize),
+                              Long.parseLong(stringMetaspaceSize));
+  }
+
+  private static OutputAnalyzer run(long maxMetaspaceSize, long metaspaceSize) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+        "-XX:MaxMetaspaceSize=" + maxMetaspaceSize,
+        "-XX:MetaspaceSize=" + metaspaceSize,
+        "-XX:-UseLargePages", // Prevent us from using 2GB large pages on solaris + sparc.
+        "-XX:+PrintFlagsFinal",
+        "-version");
+    return new OutputAnalyzer(pb.start());
+  }
+
+  private static class MetaspaceFlags {
+    public long maxMetaspaceSize;
+    public long metaspaceSize;
+    public MetaspaceFlags(long maxMetaspaceSize, long metaspaceSize) {
+      this.maxMetaspaceSize = maxMetaspaceSize;
+      this.metaspaceSize = metaspaceSize;
+    }
+  }
+}

hotspot/test/testlibrary/OutputAnalyzerTest.java

@@ -172,5 +172,22 @@ public class OutputAnalyzerTest {
     } catch (RuntimeException e) {
         // expected
     }
+
+    {
+      String aaaa = "aaaa";
+      String result = output.firstMatch(aaaa);
+      if (!aaaa.equals(result)) {
+        throw new Exception("firstMatch(String) faild to match. Expected: " + aaaa + " got: " + result);
+      }
+    }
+
+    {
+      String aa = "aa";
+      String aa_grouped_aa = aa + "(" + aa + ")";
+      String result = output.firstMatch(aa_grouped_aa, 1);
+      if (!aa.equals(result)) {
+        throw new Exception("firstMatch(String, int) failed to match. Expected: " + aa + " got: " + result);
+      }
+    }
   }
 }

hotspot/test/testlibrary/com/oracle/java/testlibrary/OutputAnalyzer.java

@@ -211,13 +211,13 @@ public final class OutputAnalyzer {
       if (matcher.find()) {
           reportDiagnosticSummary();
           throw new RuntimeException("'" + pattern
-                  + "' found in stdout \n");
+                  + "' found in stdout: '" + matcher.group() + "' \n");
       }
       matcher = Pattern.compile(pattern, Pattern.MULTILINE).matcher(stderr);
       if (matcher.find()) {
           reportDiagnosticSummary();
           throw new RuntimeException("'" + pattern
-                  + "' found in stderr \n");
+                  + "' found in stderr: '" + matcher.group() + "' \n");
       }
   }
 
@@ -253,6 +253,37 @@ public final class OutputAnalyzer {
       }
   }
 
+  /**
+   * Get the captured group of the first string matching the pattern.
+   * stderr is searched before stdout.
+   *
+   * @param pattern The multi-line pattern to match
+   * @param group The group to capture
+   * @return The matched string or null if no match was found
+   */
+  public String firstMatch(String pattern, int group) {
+    Matcher stderrMatcher = Pattern.compile(pattern, Pattern.MULTILINE).matcher(stderr);
+    Matcher stdoutMatcher = Pattern.compile(pattern, Pattern.MULTILINE).matcher(stdout);
+    if (stderrMatcher.find()) {
+      return stderrMatcher.group(group);
+    }
+    if (stdoutMatcher.find()) {
+      return stdoutMatcher.group(group);
+    }
+    return null;
+  }
+
+  /**
+   * Get the first string matching the pattern.
+   * stderr is searched before stdout.
+   *
+   * @param pattern The multi-line pattern to match
+   * @return The matched string or null if no match was found
+   */
+  public String firstMatch(String pattern) {
+    return firstMatch(pattern, 0);
+  }
+
   /**
    * Verify the exit value of the process
    *