diff --git a/test/hotspot/jtreg/gc/TestPLABAdaptToMinTLABSize.java b/test/hotspot/jtreg/gc/TestPLABAdaptToMinTLABSize.java
index 8dfefcb7d95..153d8337b06 100644
--- a/test/hotspot/jtreg/gc/TestPLABAdaptToMinTLABSize.java
+++ b/test/hotspot/jtreg/gc/TestPLABAdaptToMinTLABSize.java
@@ -24,17 +24,29 @@
 package gc;
 
 /*
- * @test TestPLABAdaptToMinTLABSize
+ * @test TestPLABAdaptToMinTLABSizeG1
  * @bug 8289137
  * @summary Make sure that Young/OldPLABSize adapt to MinTLABSize setting.
- * @requires vm.gc.Parallel | vm.gc.G1
+ * @requires vm.gc.G1
  * @library /test/lib
  * @modules java.base/jdk.internal.misc
  *          java.management
- * @run driver gc.TestPLABAdaptToMinTLABSize
+ * @run driver gc.TestPLABAdaptToMinTLABSize -XX:+UseG1GC
+ */
+
+/*
+ * @test TestPLABAdaptToMinTLABSizeParallel
+ * @bug 8289137
+ * @summary Make sure that Young/OldPLABSize adapt to MinTLABSize setting.
+ * @requires vm.gc.Parallel
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ *          java.management
+ * @run driver gc.TestPLABAdaptToMinTLABSize -XX:+UseParallelGC
  */
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collections;
 
 import jdk.test.lib.process.OutputAnalyzer;
@@ -68,9 +80,10 @@ private static void runTest(boolean shouldSucceed, String... extraArgs) throws E
     }
 
     public static void main(String[] args) throws Exception {
-        runTest(true, "-XX:MinTLABSize=100k");
+        String gc = args[0];
+        runTest(true, gc, "-XX:MinTLABSize=100k");
         // Should not succeed when explicitly specifying invalid combination.
-        runTest(false, "-XX:MinTLABSize=100k", "-XX:OldPLABSize=5k");
-        runTest(false, "-XX:MinTLABSize=100k", "-XX:YoungPLABSize=5k");
+        runTest(false, gc, "-XX:MinTLABSize=100k", "-XX:OldPLABSize=5k");
+        runTest(false, gc, "-XX:MinTLABSize=100k", "-XX:YoungPLABSize=5k");
     }
 }
diff --git a/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedHumongousFragmentation.java b/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedHumongousFragmentation.java
index fad01ab0022..f147dcbe62e 100644
--- a/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedHumongousFragmentation.java
+++ b/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedHumongousFragmentation.java
@@ -36,7 +36,7 @@
  * @build jdk.test.whitebox.WhiteBox
  * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
  * @run main/othervm -Xlog:gc+region=trace -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx1g -Xms1g
- *      -XX:VerifyGCType=full -XX:+VerifyDuringGC -XX:+VerifyAfterGC -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *      -XX:VerifyGCType=full -XX:+VerifyDuringGC -XX:+VerifyAfterGC -XX:+WhiteBoxAPI -XX:+UseG1GC -Xbootclasspath/a:.
  *      gc.g1.pinnedobjs.TestPinnedHumongousFragmentation
  */
 
diff --git a/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedObjectContents.java b/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedObjectContents.java
index e0fdc88e2a1..dcc87f811b3 100644
--- a/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedObjectContents.java
+++ b/test/hotspot/jtreg/gc/g1/pinnedobjs/TestPinnedObjectContents.java
@@ -33,7 +33,8 @@
  *          java.management
  * @build jdk.test.whitebox.WhiteBox
  * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
- * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. -XX:+ZapUnusedHeapArea -Xlog:gc,gc+ergo+cset=trace gc.g1.pinnedobjs.TestPinnedObjectContents
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
+ *      -Xbootclasspath/a:. -XX:+ZapUnusedHeapArea -Xlog:gc,gc+ergo+cset=trace gc.g1.pinnedobjs.TestPinnedObjectContents
  */
 
 package gc.g1.pinnedobjs;