8285416: [LOOM] Some nsk/jdi tests fail due to needing too many virtual threads

8282383: [LOOM] 6 nsk JDI and JDB tests sometimes failing with vthread wrapper due to running out of carrier threads

Reviewed-by: dholmes, sspitsyn, alanb, lmesnik

Author: plummercj

test/hotspot/jtreg/ProblemList-svc-vthread.txt

@@ -131,29 +131,6 @@ vmTestbase/nsk/jdi/ThreadReference/forceEarlyReturn/forceEarlyReturn014/forceEar
 vmTestbase/nsk/jdi/stress/serial/forceEarlyReturn001/TestDescription.java 8285415 generic-all
 vmTestbase/nsk/jdi/stress/serial/forceEarlyReturn002/TestDescription.java 8285415 generic-all
 
-###
-# These 2 tests try to create 10 vthreads and have them all block on a synchronized
-# method call, but on some hosts there are not enough carrier threads to support pinning
-# all 10 vthreads, so the test deadlocks. -Djdk.defaultScheduler.parallelism=<n>
-# could be used with the debuggee to ensure there are enough carrier threads.
-
-vmTestbase/nsk/jdi/EventRequestManager/stepRequests/stepreq002/TestDescription.java 8285416 generic-all
-vmTestbase/nsk/jdi/EventRequestManager/deleteEventRequests/delevtreqs002/TestDescription.java 8285416 generic-all
-
-###
-# These tests all create 5 virtual threads that block on a synchronized block, which causes
-# them to pin the carrier therad. On some of the macOS hosts there are only 4 cores,
-# so by default you only get 4 carrier threads. When this happesn the test is unable to get all
-# of the virtual threads started, and ends up timing out. -Djdk.defaultScheduler.parallelism=<n>
-# could be used with the debuggee to ensure there are enough carrier threads.
-
-vmTestbase/nsk/jdb/kill/kill001/kill001.java 8282383 macosx-x64
-vmTestbase/nsk/jdi/LocatableEvent/thread/thread001/TestDescription.java 8282383 macosx-x64
-vmTestbase/nsk/jdi/Event/request/request001/TestDescription.java 8282383 macosx-x64
-vmTestbase/nsk/jdi/EventIterator/nextEvent/nextevent001/TestDescription.java 8282383 macosx-x64
-vmTestbase/nsk/jdi/EventRequestManager/stepRequests/stepreq001/TestDescription.java 8282383 macosx-x64
-vmTestbase/nsk/jdi/ObjectReference/waitingThreads/waitingthreads002/TestDescription.java 8282383 macosx-x64
-
 ###
 # This test always times out on windows. This is due to the test forcing OOME in the
 # debuggee, which has the side affect of making the Read-Poller thread exit. Because

test/hotspot/jtreg/vmTestbase/nsk/share/jdb/Launcher.java

@@ -163,10 +163,12 @@ private String[] makeJdbCmdLine (String classToExecute) {
         args.add(jdbExecPath.trim());
 
         if (argumentHandler.isLaunchingConnector()) {
-            /* Need --enable-preview on the debuggee in order to support virtual threads. */
             boolean vthreadMode = "Virtual".equals(System.getProperty("main.wrapper"));
             if (vthreadMode) {
+                /* Need --enable-preview on the debuggee in order to support virtual threads. */
                 args.add("-R--enable-preview");
+                /* Some tests need more carrier threads than the default provided. */
+                args.add("-R-Djdk.virtualThreadScheduler.parallelism=15");
             }
         }
 

test/hotspot/jtreg/vmTestbase/nsk/share/jdi/Binder.java

@@ -751,10 +751,12 @@ private Map<String,? extends Argument> setupLaunchingConnector(LaunchingConnecto
             vmArgs = vmUserArgs;
         }
 
-        /* Need --enable-preview on the debuggee in order to support virtual threads. */
         boolean vthreadMode = "Virtual".equals(System.getProperty("main.wrapper"));
         if (vthreadMode) {
+            /* Need --enable-preview on the debuggee in order to support virtual threads. */
             vmArgs += " --enable-preview";
+            /* Some tests need more carrier threads than the default provided. */
+            vmArgs += " -Djdk.virtualThreadScheduler.parallelism=15";
         }
 
 /*