8340422: ZGC: TestAllocateHeapAt.java should not run with transparent hugepages

Reviewed-by: stefank, jsikstro

test/hotspot/jtreg/gc/z/TestAllocateHeapAt.java

@@ -27,13 +27,17 @@ package gc.z;
  * @test TestAllocateHeapAt
  * @requires vm.gc.Z & os.family == "linux"
  * @requires !vm.opt.final.UseLargePages
+ * @requires !vm.opt.final.UseTransparentHugePages
  * @summary Test ZGC with -XX:AllocateHeapAt
  * @library /test/lib
  * @run main/othervm gc.z.TestAllocateHeapAt . true
  * @run main/othervm gc.z.TestAllocateHeapAt non-existing-directory false
  */
 
+import jdk.test.lib.os.linux.HugePageConfiguration;
+import jdk.test.lib.os.linux.HugePageConfiguration.ShmemTHPMode;
 import jdk.test.lib.process.ProcessTools;
+import jtreg.SkippedException;
 
 public class TestAllocateHeapAt {
     public static void main(String[] args) throws Exception {
@@ -42,6 +46,13 @@ public class TestAllocateHeapAt {
         final String heapBackingFile = "Heap Backing File: " + directory;
         final String failedToCreateFile = "Failed to create file " + directory;
 
+        final HugePageConfiguration hugePageConfiguration = HugePageConfiguration.readFromOS();
+        final ShmemTHPMode mode = hugePageConfiguration.getShmemThpMode();
+
+        if (mode != ShmemTHPMode.never && mode != ShmemTHPMode.advise) {
+            throw new SkippedException("The UseTransparentHugePages option may not be respected with Shmem THP Mode: " + mode.name());
+        }
+
         ProcessTools.executeTestJava(
             "-XX:+UseZGC",
             "-Xlog:gc*",

test/hotspot/jtreg/runtime/os/THPsInThreadStackPreventionTest.java

@@ -45,10 +45,13 @@
  * @requires os.family == "linux"
  * @requires vm.debug
  * @requires os.arch=="amd64" | os.arch=="x86_64" | os.arch=="aarch64"
+ * @library /test/lib
  * @modules java.base/jdk.internal.misc
  *          java.management
  * @run main/manual THPsInThreadStackPreventionTest  PATCH-DISABLED
  */
+
+import jdk.test.lib.os.linux.HugePageConfiguration;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
 import jtreg.SkippedException;

test/hotspot/jtreg/runtime/os/TestHugePageDecisionsAtVMStartup.java

@@ -47,11 +47,13 @@
  * @summary Test JVM large page setup (+THP)
  * @library /test/lib
  * @requires os.family == "linux"
+ * @library /test/lib
  * @modules java.base/jdk.internal.misc
  *          java.management
  * @run driver TestHugePageDecisionsAtVMStartup -XX:+UseTransparentHugePages
  */
 
+import jdk.test.lib.os.linux.HugePageConfiguration;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
 import java.util.ArrayList;

test/hotspot/jtreg/runtime/os/TestHugePageDetection.java

@@ -28,12 +28,14 @@
  * @library /test/lib
  * @requires vm.flagless
  * @requires os.family == "linux"
+ * @library /test/lib
  * @modules java.base/jdk.internal.misc
  *          java.management
  * @run driver TestHugePageDetection
  */
 
 import java.util.*;
+import jdk.test.lib.os.linux.HugePageConfiguration;
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
 

test/jtreg-ext/requires/VMProps.java

@@ -378,6 +378,7 @@ public class VMProps implements Callable<Map<String, String>> {
         vmOptFinalFlag(map, "UnlockExperimentalVMOptions");
         vmOptFinalFlag(map, "UseCompressedOops");
         vmOptFinalFlag(map, "UseLargePages");
+        vmOptFinalFlag(map, "UseTransparentHugePages");
         vmOptFinalFlag(map, "UseVectorizedMismatchIntrinsic");
     }
 

test/lib/jdk/test/lib/os/linux/HugePageConfiguration.java

@@ -22,6 +22,8 @@
  * questions.
  */
 
+package jdk.test.lib.os.linux;
+
 import jdk.test.lib.process.OutputAnalyzer;
 
 import java.io.*;
@@ -33,7 +35,7 @@ import java.util.regex.Pattern;
 // - a) the Operating System (the truth)
 // - b) the JVM log (-Xlog:pagesize)
 // This is used e.g. in TestHugePageDetection to determine if the JVM detects the correct settings from the OS.
-class HugePageConfiguration {
+public class HugePageConfiguration {
 
     public static class ExplicitHugePageConfig implements Comparable<ExplicitHugePageConfig> {
         public long pageSize = -1;
@@ -63,11 +65,11 @@ class HugePageConfiguration {
     Set<ExplicitHugePageConfig> _explicitHugePageConfigurations;
     long _explicitDefaultHugePageSize = -1;
 
-    enum THPMode {always, never, madvise}
+    public enum THPMode {always, never, madvise}
     THPMode _thpMode;
     long _thpPageSize;
 
-    enum ShmemTHPMode {always, within_size, advise, never, deny, force, unknown}
+    public enum ShmemTHPMode {always, within_size, advise, never, deny, force, unknown}
     ShmemTHPMode _shmemThpMode;
 
     public Set<ExplicitHugePageConfig> getExplicitHugePageConfigurations() {
@@ -133,6 +135,15 @@ class HugePageConfiguration {
                 '}';
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(_explicitDefaultHugePageSize,
+                            _thpPageSize,
+                            _explicitHugePageConfigurations,
+                            _thpMode,
+                            _shmemThpMode);
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;