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8370843: Deprecate AlwaysActAsServerClassMachine and NeverActAsServerClassMachine

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Reviewed-by: ayang, kvn
This commit is contained in:
Joel Sikström 2025-11-10 09:41:55 +00:00
parent f48ad21ecc
commit c0b82ff2e5
3 changed files with 24 additions and 22 deletions
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4
src/hotspot/share/gc/shared/gc_globals.hpp
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@ -263,10 +263,10 @@
"before pushing a continuation entry") \
\
product_pd(bool, NeverActAsServerClassMachine, \
"Never act like a server-class machine") \
"(Deprecated) Never act like a server-class machine") \
\
product(bool, AlwaysActAsServerClassMachine, false, \
"Always act like a server-class machine") \
"(Deprecated) Always act like a server-class machine") \
\
product(uint64_t, MaxRAM, 0, \
"(Deprecated) Real memory size (in bytes) used to set maximum " \

2
src/hotspot/share/runtime/arguments.cpp
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@ -537,6 +537,8 @@ static SpecialFlag const special_jvm_flags[] = {
{ "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
{ "MaxRAM", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
{ "AggressiveHeap", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
{ "NeverActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
{ "AlwaysActAsServerClassMachine", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) },
// --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in:
{ "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() },

40
src/java.base/share/man/java.md
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@ -1235,26 +1235,6 @@ These `java` options control the runtime behavior of the Java HotSpot VM.
This option is only supported on Linux with GNU C Library (glibc).
`-XX:+NeverActAsServerClassMachine`
: Enable the "Client VM emulation" mode which only uses the C1 JIT compiler,
a 32Mb CodeCache and the Serial GC. The maximum amount of memory that the
JVM may use (controlled by the `-XX:MaxRAM=n` flag) is set to 1GB by default.
The string "emulated-client" is added to the JVM version string.
By default the flag is set to `true` only on Windows in 32-bit mode and
`false` in all other cases.
The "Client VM emulation" mode will not be enabled if any of the following
flags are used on the command line:
```
-XX:{+|-}TieredCompilation
-XX:CompilationMode=mode
-XX:TieredStopAtLevel=n
-XX:{+|-}EnableJVMCI
-XX:{+|-}UseJVMCICompiler
```
`-XX:ObjectAlignmentInBytes=`*alignment*
: Sets the memory alignment of Java objects (in bytes). By default, the value
is set to 8 bytes. The specified value should be a power of 2, and must be
@ -2951,6 +2931,26 @@ they're used.
the configuration of the computer (RAM and CPU). By default, the option
is disabled and the heap sizes are configured less aggressively.
`-XX:+NeverActAsServerClassMachine`
: Enable the "Client VM emulation" mode which only uses the C1 JIT compiler,
a 32Mb CodeCache and the Serial GC. The maximum amount of memory that the
JVM may use (controlled by the `-XX:MaxRAM=n` flag) is set to 1GB by default.
The string "emulated-client" is added to the JVM version string.
By default the flag is set to `true` only on Windows in 32-bit mode and
`false` in all other cases.
The "Client VM emulation" mode will not be enabled if any of the following
flags are used on the command line:
```
-XX:{+|-}TieredCompilation
-XX:CompilationMode=mode
-XX:TieredStopAtLevel=n
-XX:{+|-}EnableJVMCI
-XX:{+|-}UseJVMCICompiler
```
## Obsolete Java Options
These `java` options are still accepted but ignored, and a warning is issued