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test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java

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*** 291,12 ***
                  String.format("-XX:LogFile=hotspot_%s_%%p.log", phase),
                  String.format("-XX:ErrorFile=hs_err_%s_%%p.log", phase),
                  String.format("-XX:ReplayDataFile=replay_%s_%%p.log", phase),
                  // MethodHandle MUST NOT be compiled
                  "-XX:CompileCommand=exclude,java/lang/invoke/MethodHandle.*",
-                 // Stress* are c2-specific stress flags, so IgnoreUnrecognizedVMOptions is needed
                  "-XX:+IgnoreUnrecognizedVMOptions",
                  "-XX:+StressLCM",
                  "-XX:+StressGCM",
                  "-XX:+StressIGVN",
                  "-XX:+StressCCP",
                  // StressSeed is uint
--- 291,14 ---
                  String.format("-XX:LogFile=hotspot_%s_%%p.log", phase),
                  String.format("-XX:ErrorFile=hs_err_%s_%%p.log", phase),
                  String.format("-XX:ReplayDataFile=replay_%s_%%p.log", phase),
                  // MethodHandle MUST NOT be compiled
                  "-XX:CompileCommand=exclude,java/lang/invoke/MethodHandle.*",
                  "-XX:+IgnoreUnrecognizedVMOptions",
+                 // Do not pay extra zapping cost for explicit GC invocations
+                 "-XX:-ZapUnusedHeapArea",
+                 // Stress* are c2-specific stress flags, so IgnoreUnrecognizedVMOptions is needed
                  "-XX:+StressLCM",
                  "-XX:+StressGCM",
                  "-XX:+StressIGVN",
                  "-XX:+StressCCP",
                  // StressSeed is uint
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