8232588: G1 concurrent System.gc can return early or late
8233279: G1: GCLocker GC with +GCLockerInvokesConcurrent spins while cycle in progress
Summary: Refactor G1CH::try_collect and fix bugs with concurrent collections.
Reviewed-by: tschatzl, sjohanss
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# Tiered testing definitions
# (Nearly) all langtools tests are tier 1.
tier1 = \
jdk \
lib \
tools \
-jdk/jshell/ExternalEditorTest.java \
-jdk/jshell/FailOverDirectExecutionControlTest.java \
-jdk/jshell/FailOverExecutionControlDyingLaunchTest.java \
-jdk/jshell/FailOverExecutionControlHangingListenTest.java \
-jdk/jshell/JdiHangingListenExecutionControlTest.java \
-jdk/jshell/JdiLaunchingExecutionControlTest.java \
-jdk/jshell/JdiListeningExecutionControlTest.java \
-jdk/jshell/JdiListeningLocalhostExecutionControlTest.java \
-jdk/jshell/ToolBasicTest.java \
-jdk/jshell/ToolLocaleMessageTest.java \
-jdk/jshell/ToolReloadTest.java \
-jdk/jshell/UserInputTest.java \
-jdk/jshell/UserJdiUserRemoteTest.java
# (Almost) no langtools tests are tier 2.
tier2 = \
jdk/jshell/ExternalEditorTest.java \
jdk/jshell/FailOverDirectExecutionControlTest.java \
jdk/jshell/FailOverExecutionControlDyingLaunchTest.java \
jdk/jshell/FailOverExecutionControlHangingListenTest.java \
jdk/jshell/JdiHangingListenExecutionControlTest.java \
jdk/jshell/JdiLaunchingExecutionControlTest.java \
jdk/jshell/JdiListeningExecutionControlTest.java \
jdk/jshell/JdiListeningLocalhostExecutionControlTest.java \
jdk/jshell/ToolBasicTest.java \
jdk/jshell/ToolLocaleMessageTest.java \
jdk/jshell/ToolReloadTest.java \
jdk/jshell/UserInputTest.java \
jdk/jshell/UserJdiUserRemoteTest.java
# No langtools tests are tier 3 either.
tier3 =