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diff src/share/vm/runtime/globals.hpp @ 1837:c99c53f07c14

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6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field. Reviewed-by: jmasa, johnc, poonam
author ysr
date Wed, 29 Sep 2010 16:17:02 -0700
parents 894b1d7c7e01
children 0715f0cf171d
line wrap: on
line diff
--- a/src/share/vm/runtime/globals.hpp	Tue Sep 28 15:56:15 2010 -0700
+++ b/src/share/vm/runtime/globals.hpp	Wed Sep 29 16:17:02 2010 -0700
@@ -280,6 +280,10 @@
 //    UnlockExperimentalVMOptions flag, which allows the control and
 //    modification of the experimental flags.
 //
+// Nota bene: neither diagnostic nor experimental options should be used casually,
+//    and they are not supported on production loads, except under explicit
+//    direction from support engineers.
+//
 // manageable flags are writeable external product flags.
 //    They are dynamically writeable through the JDK management interface
 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
@@ -1809,17 +1813,17 @@
   develop(uintx, PromotionFailureALotInterval, 5,                           \
           "Total collections between promotion failures alot")              \
                                                                             \
-  develop(intx, WorkStealingSleepMillis, 1,                                 \
+  experimental(intx, WorkStealingSleepMillis, 1,                            \
           "Sleep time when sleep is used for yields")                       \
                                                                             \
-  develop(uintx, WorkStealingYieldsBeforeSleep, 1000,                       \
+  experimental(uintx, WorkStealingYieldsBeforeSleep, 1000,                  \
           "Number of yields before a sleep is done during workstealing")    \
                                                                             \
-  develop(uintx, WorkStealingHardSpins, 4096,                               \
+  experimental(uintx, WorkStealingHardSpins, 4096,                          \
           "Number of iterations in a spin loop between checks on "          \
           "time out of hard spin")                                          \
                                                                             \
-  develop(uintx, WorkStealingSpinToYieldRatio, 10,                          \
+  experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
           "Ratio of hard spins to calls to yield")                          \
                                                                             \
   product(uintx, PreserveMarkStackSize, 1024,                               \