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6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time

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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
This commit is contained in:
Y. Srinivas Ramakrishna 2010-09-29 16:17:02 -07:00
parent 1cdd538ea5
commit cf2163334f
4 changed files with 97 additions and 34 deletions
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12
hotspot/src/share/vm/runtime/globals.hpp
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@ -280,6 +280,10 @@ class CommandLineFlags {
// 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 @@ class CommandLineFlags {
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, \