hotspot/test/runtime/NMT/MallocSiteHashOverflow.java

rev 6898 : 8062870: src/share/vm/services/mallocTracker.hpp:64 assert(_count > 0) failed: Negative counter
Summary: Signed bitfield size y can only have (1 << y)-1 values.
Reviewed-by: shade, dholmes, jrose, ctornqvi, gtriantafill

*** 22,64 ****
   */
  
  /*
   * @test
   * @summary Test corner case that overflows malloc site hashtable bucket
   * @key nmt jcmd stress
   * @library /testlibrary /testlibrary/whitebox
-  * @ignore - This test is disabled since it will stress NMT and timeout during normal testing
   * @build MallocSiteHashOverflow
   * @run main ClassFileInstaller sun.hotspot.WhiteBox
!  * @run main/othervm/timeout=480 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
   */
  
  import com.oracle.java.testlibrary.*;
  import sun.hotspot.WhiteBox;
  
  public class MallocSiteHashOverflow {
!     private static long K = 1024;
      public static void main(String args[]) throws Exception {
-         String vm_name = System.getProperty("java.vm.name");
  
          // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
-         // For 64-bit systems, create 64K + 1 malloc sites with the same hash bucket to overflow a hash bucket
          long entries = 257;
-         if (Platform.is64bit()) {
-             entries = 64 * K + 1;
-         }
  
          OutputAnalyzer output;
          WhiteBox wb = WhiteBox.getWhiteBox();
  
          // Grab my own PID
          String pid = Integer.toString(ProcessTools.getProcessId());
          ProcessBuilder pb = new ProcessBuilder();
  
!         wb.NMTOverflowHashBucket(entries);
  
!         // Run 'jcmd <pid> VM.native_memory summary'
          pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
          output = new OutputAnalyzer(pb.start());
          output.shouldContain("Tracking level has been downgraded due to lack of resources");
      }
  }
--- 22,78 ----
   */
  
  /*
   * @test
   * @summary Test corner case that overflows malloc site hashtable bucket
+  * @requires sun.arch.data.model == "32"
   * @key nmt jcmd stress
   * @library /testlibrary /testlibrary/whitebox
   * @build MallocSiteHashOverflow
   * @run main ClassFileInstaller sun.hotspot.WhiteBox
!  * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocSiteHashOverflow
   */
  
  import com.oracle.java.testlibrary.*;
  import sun.hotspot.WhiteBox;
  
  public class MallocSiteHashOverflow {
! 
      public static void main(String args[]) throws Exception {
  
+         // Size of entries based on malloc tracking header defined in mallocTracker.hpp
          // For 32-bit systems, create 257 malloc sites with the same hash bucket to overflow a hash bucket
          long entries = 257;
  
          OutputAnalyzer output;
          WhiteBox wb = WhiteBox.getWhiteBox();
+         int MAX_HASH_SIZE = wb.NMTGetHashSize();
  
          // Grab my own PID
          String pid = Integer.toString(ProcessTools.getProcessId());
          ProcessBuilder pb = new ProcessBuilder();
  
!         // Verify that current tracking level is "detail"
!         pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
!         output = new OutputAnalyzer(pb.start());
!         output.shouldContain("Native Memory Tracking Statistics");
  
!         // Attempt to cause NMT to downgrade tracking level by allocating small amounts
!         // of memory with random pseudo call stack
!         int pc = 1;
!         for (int i = 0; i < entries; i++) {
!             long addr = wb.NMTMallocWithPseudoStack(1, pc);
!             if (addr == 0) {
!                 throw new RuntimeException("NMTMallocWithPseudoStack: out of memory");
!             }
!             // We free memory here since it doesn't affect pseudo malloc alloc site hash table entries
!             wb.NMTFree(addr);
!             pc += MAX_HASH_SIZE;
!             if (i == entries) {
!                 // Verify that tracking has been downgraded
                  pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "statistics"});
                  output = new OutputAnalyzer(pb.start());
                  output.shouldContain("Tracking level has been downgraded due to lack of resources");
              }
+         }
+     }
  }