8185062: Set AssumeMP to true and deprecate the flag
Reviewed-by: shade, dcubed, kvn
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parent
b787f1b55b
commit
fd93a04684
src/hotspot/share/runtime
test/hotspot/jtreg/runtime/CommandLine
@ -377,6 +377,7 @@ static SpecialFlag const special_jvm_flags[] = {
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// --- Non-alias flags - sorted by obsolete_in then expired_in:
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{ "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() },
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{ "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },
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{ "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
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{ "MonitorInUseLists", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() },
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{ "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
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{ "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() },
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@ -4476,16 +4477,6 @@ jint Arguments::apply_ergo() {
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set_shared_spaces_flags();
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#if defined(SPARC)
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// BIS instructions require 'membar' instruction regardless of the number
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// of CPUs because in virtualized/container environments which might use only 1
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// CPU, BIS instructions may produce incorrect results.
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if (FLAG_IS_DEFAULT(AssumeMP)) {
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FLAG_SET_DEFAULT(AssumeMP, true);
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}
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#endif
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// Check the GC selections again.
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if (!check_gc_consistency()) {
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return JNI_EINVAL;
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@ -592,8 +592,8 @@ public:
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range(8, 256) \
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constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
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\
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product(bool, AssumeMP, false, \
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"Instruct the VM to assume multiple processors are available") \
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product(bool, AssumeMP, true, \
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"(Deprecated) Instruct the VM to assume multiple processors are available")\
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\
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/* UseMembar is theoretically a temp flag used for memory barrier */ \
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/* removal testing. It was supposed to be removed before FCS but has */ \
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@ -213,7 +213,7 @@ class os: AllStatic {
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// the bootstrap routine for the stub generator needs to check
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// the processor count directly and leave the bootstrap routine
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// in place until called after initialization has ocurred.
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return (_processor_count != 1) || AssumeMP;
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return AssumeMP || (_processor_count != 1);
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}
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static julong available_memory();
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static julong physical_memory();
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@ -46,6 +46,7 @@ public class VMDeprecatedOptions {
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{"MaxRAMFraction", "8"},
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{"MinRAMFraction", "2"},
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{"InitialRAMFraction", "64"},
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{"AssumeMP", "false"},
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// deprecated alias flags (see also aliased_jvm_flags):
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{"DefaultMaxRAMFraction", "4"},
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