diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp index a4b2994ac55..a49116fd91d 100644 --- a/src/hotspot/share/runtime/arguments.cpp +++ b/src/hotspot/share/runtime/arguments.cpp @@ -528,9 +528,6 @@ static SpecialFlag const special_jvm_flags[] = { { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, -#ifdef LINUX - { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) }, -#endif { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) }, #ifdef _LP64 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() }, @@ -540,7 +537,6 @@ static SpecialFlag const special_jvm_flags[] = { // -------------- Obsolete Flags - sorted by expired_in -------------- - { "PerfDataSamplingInterval", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::jdk(26) }, #ifdef LINUX { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) }, #endif diff --git a/src/java.base/share/man/java.md b/src/java.base/share/man/java.md index bb010e6e1c7..fc8cbb23aff 100644 --- a/src/java.base/share/man/java.md +++ b/src/java.base/share/man/java.md @@ -2917,71 +2917,12 @@ when they're used. ## Removed Java Options -These `java` options have been removed in JDK @@VERSION_SPECIFICATION@@ and using them results in an error of: - -> `Unrecognized VM option` *option-name* - -`-XX:RTMAbortRatio=`*abort\_ratio* -: Specifies the RTM abort ratio is specified as a percentage (%) of all - executed RTM transactions. If a number of aborted transactions becomes - greater than this ratio, then the compiled code is deoptimized. This ratio - is used when the `-XX:+UseRTMDeopt` option is enabled. The default value of - this option is 50. This means that the compiled code is deoptimized if 50% - of all transactions are aborted. - -`-XX:RTMRetryCount=`*number\_of\_retries* -: Specifies the number of times that the RTM locking code is retried, when it - is aborted or busy, before falling back to the normal locking mechanism. - The default value for this option is 5. The `-XX:UseRTMLocking` option must - be enabled. - -`-XX:+UseRTMDeopt` -: Autotunes RTM locking depending on the abort ratio. This ratio is specified - by the `-XX:RTMAbortRatio` option. If the number of aborted transactions - exceeds the abort ratio, then the method containing the lock is deoptimized - and recompiled with all locks as normal locks. This option is disabled by - default. The `-XX:+UseRTMLocking` option must be enabled. - -`-XX:+UseRTMLocking` -: Generates Restricted Transactional Memory (RTM) locking code for all - inflated locks, with the normal locking mechanism as the fallback handler. - This option is disabled by default. Options related to RTM are available - only on x86 CPUs that support Transactional Synchronization Extensions (TSX). - - RTM is part of Intel's TSX, which is an x86 instruction set extension and - facilitates the creation of multithreaded applications. RTM introduces the - new instructions `XBEGIN`, `XABORT`, `XEND`, and `XTEST`. The `XBEGIN` and - `XEND` instructions enclose a set of instructions to run as a transaction. - If no conflict is found when running the transaction, then the memory and - register modifications are committed together at the `XEND` instruction. - The `XABORT` instruction can be used to explicitly abort a transaction and - the `XTEST` instruction checks if a set of instructions is being run in a - transaction. - - A lock on a transaction is inflated when another thread tries to access the - same transaction, thereby blocking the thread that didn't originally - request access to the transaction. RTM requires that a fallback set of - operations be specified in case a transaction aborts or fails. An RTM lock - is a lock that has been delegated to the TSX's system. - - RTM improves performance for highly contended locks with low conflict in a - critical region (which is code that must not be accessed by more than one - thread concurrently). RTM also improves the performance of coarse-grain - locking, which typically doesn't perform well in multithreaded - applications. (Coarse-grain locking is the strategy of holding locks for - long periods to minimize the overhead of taking and releasing locks, while - fine-grained locking is the strategy of trying to achieve maximum - parallelism by locking only when necessary and unlocking as soon as - possible.) Also, for lightly contended locks that are used by different - threads, RTM can reduce false cache line sharing, also known as cache line - ping-pong. This occurs when multiple threads from different processors are - accessing different resources, but the resources share the same cache line. - As a result, the processors repeatedly invalidate the cache lines of other - processors, which forces them to read from main memory instead of their - cache. +No documented java options have been removed in JDK @@VERSION_SPECIFICATION@@. For the lists and descriptions of options removed in previous releases see the *Removed Java Options* section in: +- [The `java` Command, Release 25](https://docs.oracle.com/en/java/javase/25/docs/specs/man/java.html) + - [The `java` Command, Release 24](https://docs.oracle.com/en/java/javase/24/docs/specs/man/java.html) - [The `java` Command, Release 23](https://docs.oracle.com/en/java/javase/23/docs/specs/man/java.html)