test/hotspot/jtreg/runtime/whitebox/WBStackSize.java

*** 19,29 ****
   * 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.
   */
  
! /*
   * @test WBStackSize
   * @summary verify that whitebox functions getThreadFullStackSize() and getThreadRemainingStackSize are working
   * @modules java.base/jdk.internal.misc
   * @library /test/lib
   * @build sun.hotspot.WhiteBox
--- 19,29 ----
   * 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.
   */
  
! /**
   * @test WBStackSize
   * @summary verify that whitebox functions getThreadFullStackSize() and getThreadRemainingStackSize are working
   * @modules java.base/jdk.internal.misc
   * @library /test/lib
   * @build sun.hotspot.WhiteBox
*** 41,50 ****
--- 41,51 ----
   *
   * Please file a test bug, if this is a problem.
   */
  
  import sun.hotspot.WhiteBox;
+ import jdk.test.lib.Platform;
  
  public class WBStackSize {
  
      static final long K = 1024;
  
*** 81,103 ****
              }
          }
      }
  
      public static void main(String[] args) {
          long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K;
          System.out.println("ThreadStackSize VM option: " + configStackSize);
  
!         long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * wb.getVMPageSize();
          System.out.println("Size of protected shadow pages: " + stackProtectionSize);
  
          long actualStackSize = wb.getThreadStackSize();
          System.out.println("Full stack size: " + actualStackSize);
  
          if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) {
!             throw new RuntimeException("getThreadFullStackSize value [" + actualStackSize
                                       + "] should be within 90%..110% of ThreadStackSize value");
          }
  
          long remainingStackSize = wb.getThreadRemainingStackSize();
          System.out.println("Remaining stack size in main(): " + remainingStackSize);
  
          // Up to 150k can be already allocated by VM and some space is used for stack protection.
--- 82,126 ----
              }
          }
      }
  
      public static void main(String[] args) {
+         long pageSize = wb.getVMPageSize();
+ 
          long configStackSize = wb.getIntxVMFlag("ThreadStackSize") * K;
          System.out.println("ThreadStackSize VM option: " + configStackSize);
  
!         long stackProtectionSize = wb.getIntxVMFlag("StackShadowPages") * pageSize;
          System.out.println("Size of protected shadow pages: " + stackProtectionSize);
  
          long actualStackSize = wb.getThreadStackSize();
          System.out.println("Full stack size: " + actualStackSize);
  
+         if (!Platform.isAix()) {
              if (Math.abs(actualStackSize - configStackSize) > configStackSize * 0.1) {
!                 throw new RuntimeException("getThreadStackSize value [" + actualStackSize
                                             + "] should be within 90%..110% of ThreadStackSize value");
              }
+         } else {
+             // AIX pthread implementation returns stacks with sizes varying a lot.
+             // We add +64K to assure stacks are not too small, thus we get
+             // even more variation to bigger sizes. So only check the lower bound.
+             // Allow for at least one page deviation.
+             long slack = (long)(configStackSize * 0.1);
+             if (slack < pageSize) {
+                 if (configStackSize - actualStackSize > pageSize) {
+                     throw new RuntimeException("getThreadStackSize value [" + actualStackSize
+                                                + "] should not be more than one page smaller than "
+                                                + "ThreadStackSize value");
+                 }
+             } else {
+                 if (configStackSize - actualStackSize > slack) {
+                     throw new RuntimeException("getThreadStackSize value [" + actualStackSize
+                                                + "] should not be less than 90% of ThreadStackSize value");
+                 }
+             }
+         }
  
          long remainingStackSize = wb.getThreadRemainingStackSize();
          System.out.println("Remaining stack size in main(): " + remainingStackSize);
  
          // Up to 150k can be already allocated by VM and some space is used for stack protection.