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6618726: Introduce -XX:+UnlockExperimentalVMOptions flag

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Experimental() flags will protect features of an experimental nature that are not supported in the regular product build. Made UseG1GC an experimental flag.

Reviewed-by: jmasa, kamg, coleenp
This commit is contained in:
Y. Srinivas Ramakrishna 2008-06-30 17:04:59 -07:00
parent a0b0fb42fd
commit d44be8e3a0
6 changed files with 47 additions and 18 deletions
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27
hotspot/src/share/vm/runtime/globals.hpp
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@ -255,7 +255,19 @@ class CommandLineFlags {
// diagnostic information about VM problems. To use a VM diagnostic
// option, you must first specify +UnlockDiagnosticVMOptions.
// (This master switch also affects the behavior of -Xprintflags.)
//
// experimental flags are in support of features that are not
// part of the officially supported product, but are available
// for experimenting with. They could, for example, be performance
// features that may not have undergone full or rigorous QA, but which may
// help performance in some cases and released for experimentation
// by the community of users and developers. This flag also allows one to
// be able to build a fully supported product that nonetheless also
// ships with some unsupported, lightly tested, experimental features.
// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
// UnlockExperimentalVMOptions flag, which allows the control and
// modification of the experimental flags.
//
// 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.
@ -285,7 +297,7 @@ class CommandLineFlags {
// Note that when there is a need to support develop flags to be writeable,
// it can be done in the same way as product_rw.
#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct, manageable, product_rw, lp64_product) \
#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
\
lp64_product(bool, UseCompressedOops, false, \
"Use 32-bit object references in 64-bit VM. " \
@ -304,7 +316,10 @@ class CommandLineFlags {
"Prints flags that appeared on the command line") \
\
diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
"Enable processing of flags relating to field diagnostics") \
"Enable normal processing of flags relating to field diagnostics")\
\
experimental(bool, UnlockExperimentalVMOptions, false, \
"Enable normal processing of flags relating to experimental features")\
\
product(bool, JavaMonitorsInStackTrace, true, \
"Print info. about Java monitor locks when the stacks are dumped")\
@ -1114,7 +1129,7 @@ class CommandLineFlags {
product(bool, UseSerialGC, false, \
"Use the serial garbage collector") \
\
product(bool, UseG1GC, false, \
experimental(bool, UseG1GC, false, \
"Use the Garbage-First garbage collector") \
\
product(bool, UseParallelGC, false, \
@ -3241,6 +3256,7 @@ class CommandLineFlags {
#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
#ifdef PRODUCT
@ -3263,6 +3279,7 @@ class CommandLineFlags {
#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name;
#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
#ifdef PRODUCT
@ -3280,6 +3297,6 @@ class CommandLineFlags {
#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
#endif // _LP64
RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)