Zgu/threadfilter

[zhengyu123]

What does this PR do?:

Motivation:

Additional Notes:

How to test the change?:

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.
• JIRA: [JIRA-XXXX]

Unsure? Have a question? Request a review!

[datadog-datadog-prod-us1]

🟠 Code Quality Violation

Suggested change

	private static long activeCountAddr = 0;
	private static long activeCountAddr;

Remove initialization, this is already the default value. (...read more)

When initializing fields, prevent initializing fields to the default value. Any additional initialization means more bytecode instructions, and allocating many of these objects may impact your application performance.

If you initialize to a default value, remove the initialization.

    

[github-actions]

🔧 Report generated by pr-comment-cppcheck

CppCheck Report

Errors (2)

• There is an unknown macro here somewhere. Configuration is required. If LP64_ONLY is a macro then please configure it.
• syntax error

Warnings (4)

• The class 'RecordingBuffer' defines member function with name 'flushIfNeeded' also defined in its parent class 'Buffer'.
• Member variable 'JitWriteProtection::_restore' is not initialized in the constructor.
• Member variable 'JitWriteProtection::_restore' is not initialized in the constructor.
• Member variable 'ElfParser::_vaddr_diff' is not initialized in the constructor.

Style Violations (298)

• Class 'Arguments' has a constructor with 1 argument that is not explicit.
• struct member 'Multiplier::symbol' is never used.
• struct member 'Multiplier::multiplier' is never used.
• class member 'Error::OK' is never used.
• Class 'AsyncSampleMutex' has a constructor with 1 argument that is not explicit.
• The class 'NativeFunc' does not declare a constructor although it has private member variables which likely require initialization.
• Local variable 'count' shadows outer function
• Local variable 'blob' shadows outer function
• Local variable 'i' shadows outer variable
• Parameter 'prefixes' can be declared as reference to const
• Variable 'cb1' can be declared as pointer to const
• Variable 'cb2' can be declared as pointer to const
• Variable 'fd1' can be declared as pointer to const
• Variable 'fd2' can be declared as pointer to const
• Parameter 'name' can be declared as pointer to const
• Consider using std::transform algorithm instead of a raw loop.
• struct member 'ContextPage::capacity' is never used.
• struct member 'ContextPage::storage' is never used.
• class member 'Contexts::_max_pages' is never used.
• class member 'Contexts::_pages' is never used.
• The function 'check' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'registerThread' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'unregisterThread' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'name' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'interval' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'check' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'stop' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'enableEvents' overrides a function in a base class but is not marked with a 'override' specifier.
• class member 'CTimer::_cstack' is never used.
• class member 'CTimer::_signal' is never used.
• class member 'CTimer::_max_timers' is never used.
• class member 'CTimer::_timers' is never used.
• class member 'Shims::_tid_setter_ref' is never used.
• Class 'Dictionary' has a constructor with 1 argument that is not explicit.
• struct member 'DictRow::keys' is never used.
• struct member 'DictRow::next' is never used.
• Operator '|' with one operand equal to zero is redundant.
• Operator '|' with one operand equal to zero is redundant.
• Operator '|' with one operand equal to zero is redundant.
• Local variable 'table' shadows outer function
• Local variable 'pc_off' shadows outer variable
• Variable 'table' can be declared as pointer to const
• struct member 'FrameDesc::fp_off' is never used.
• struct member 'FrameDesc::pc_off' is never used.
• class member 'DwarfParser::_name' is never used.
• class member 'DwarfParser::_image_base' is never used.
• class member 'DwarfParser::_capacity' is never used.
• class member 'DwarfParser::_prev' is never used.
• class member 'DwarfParser::_data_align' is never used.
• Class 'WallClockEpochEvent' has a constructor with 1 argument that is not explicit.
• class member 'LockEvent::_address' is never used.
• class member 'LockEvent::_timeout' is never used.
• The function 'name' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'interval' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'check' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'stop' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'enableEvents' overrides a function in a base class but is not marked with a 'override' specifier.
• class member 'ITimer::_cstack' is never used.
• The class 'J9WallClock' does not declare a constructor although it has private member variables which likely require initialization.
• The function 'name' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'interval' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'stop' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'enableEvents' overrides a function in a base class but is not marked with a 'override' specifier.
• class member 'J9WallClock::_max_stack_depth' is never used.
• class member 'J9WallClock::_running' is never used.
• Class 'Element' has a constructor with 1 argument that is not explicit.
• Class 'NoField' has a constructor with 1 argument that is not explicit.
• The function 'is_nofield' overrides a function in a base class but is not marked with a 'override' specifier.
• class member 'JfrMetadata::_initialized' is never used.
• class member 'JVM::_is_readable_pointer_resolved' is never used.
• class member 'JVM::_is_readable_pointer' is never used.
• The class 'VirtualSpaceSummary' does not declare a constructor although it has private member variables which likely require initialization.
• The class 'GCHeapSummary' does not declare a constructor although it has private member variables which likely require initialization.
• The class 'CollectedHeapWrapper' does not declare a constructor although it has private member variables which likely require initialization.
• class member 'VirtualSpaceSummary::_committed_end' is never used.
• class member 'GCHeapSummary::vptr' is never used.
• class member 'CollectedHeapWrapper::vptr' is never used.
• class member 'CollectedHeapWrapper::_gc_heap_log' is never used.
• class member 'CollectedHeapWrapper::_capacity_at_last_gc' is never used.
• class member 'CollectedHeapWrapper::_used_at_last_gc' is never used.
• struct member 'Chunk::prev' is never used.
• struct member 'Chunk::offs' is never used.
• struct member 'Chunk::_padding' is never used.
• class member 'LinearAllocator::_chunk_size' is never used.
• class member 'LinearAllocator::_tail' is never used.
• class member 'LinearAllocator::_reserve' is never used.
• Class 'SpinLock' has a constructor with 1 argument that is not explicit.
• struct member 'TrackingEntry::skipped' is never used.
• class member 'LivenessTracker::MAX_TRACKING_TABLE_SIZE' is never used.
• class member 'LivenessTracker::MIN_SAMPLING_INTERVAL' is never used.
• class member 'LivenessTracker::_table_lock' is never used.
• class member 'Log::_file' is never used.
• class member 'Log::LEVEL_NAME' is never used.
• The function 'check' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'stop' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'interval' overrides a function in a base class but is not marked with a 'override' specifier.
• class member 'ObjectSampler::CONFIG_UPDATE_CHECK_PERIOD_SECS' is never used.
• class member 'JitWriteProtection::_restore' is never used.
• class member 'OS::page_size' is never used.
• class member 'OS::page_mask' is never used.
• The function 'rewind' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'next' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'size' overrides a function in a base class but is not marked with a 'override' specifier.
• Variable 'entry' can be declared as pointer to const
• The function 'rewind' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'next' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'size' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'check' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'enableEvents' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'registerThread' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'unregisterThread' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'interval' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'enableEvents' overrides a function in a base class but is identical to the overridden function
• The function 'registerThread' overrides a function in a base class but is identical to the overridden function
• The function 'unregisterThread' overrides a function in a base class but is identical to the overridden function
• The function 'check' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'start' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'stop' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'registerThread' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'unregisterThread' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'interval' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'name' overrides a function in a base class but is not marked with a 'override' specifier.
• The function 'enableEvents' overrides a function in a base class but is not marked with a 'override' specifier.
• class member 'PerfEvents::_max_events' is never used.
• class member 'PerfEvents::_events' is never used.
• class member 'PerfEvents::_event_type' is never used.
• class member 'PerfEvents::_ring' is never used.
• class member 'PerfEvents::_cstack' is never used.
• class member 'PerfEvents::_use_mmap_page' is never used.
• Class 'ReservoirSampler' has a constructor with 1 argument that is not explicit.
• Parameter 'ptr' can be declared as pointer to const
• Parameter 'ptr' can be declared as pointer to const. However it seems that 'load32' is a callback function, if 'ptr' is declared with const you might also need to cast function pointer(s).
• Class 'SymbolDesc' has a constructor with 1 argument that is not explicit.
• Class 'MemoryMapDesc' has a constructor with 1 argument that is not explicit.
• Local variable 'section' shadows outer function
• Local variable 'section' shadows outer function
• Local variable 'section' shadows outer function
• Variable 'ident' can be declared as pointer to const
• Parameter 'section' can be declared as pointer to const
• Variable 'checked' can be declared as pointer to const
• Variable 'pheader' can be declared as pointer to const
• Variable 'sym' can be declared as pointer to const
• Variable 'sym' can be declared as pointer to const
• Variable 'chain' can be declared as pointer to const
• Variable 'plt' can be declared as pointer to const
• Variable 'note' can be declared as pointer to const
• Variable 'sym' can be declared as pointer to const
• struct member 'RootSymbolEntry::name' is never used.
• struct member 'RootSymbolEntry::kind' is never used.
• class member 'ElfParser::_root_symbols' is never used.
• Class 'ExclusiveLock' has a constructor with 1 argument that is not explicit.
• Class 'SharedLock' has a constructor with 1 argument that is not explicit.
• Same expression on both sides of '-'.
• Local variable 'count' shadows outer function
• Parameter 'failures' can be declared as reference to const
• class member 'ProfiledThread::_buffer_size' is never used.
• class member 'ProfiledThread::_buffer' is never used.
• Local variable 'bitmap' shadows outer function
• Local variable 'word' shadows outer function
• class member 'ThreadInfo::_thread_names' is never used.
• class member 'ThreadInfo::_thread_ids' is never used.
• Condition 'enabled()' is always false
• The function 'loadAcquire' is never used.
• The function 'message' is never used.
• The function 'hasOption' is never used.
• The function 'cpuSamplerInterval' is never used.
• The function 'acquired' is never used.
• The function 'offset' is never used.
• The function 'skip' is never used.
• The function 'put16' is never used.
• The function 'put64' is never used.
• The function 'putFloat' is never used.
• The function 'putVar64' is never used.
• The function 'findBlobByAddress' is never used.
• The function 'binarySearch' is never used.
• The function 'dump' is never used.
• The function 'findSymbolsByPrefix' is never used.
• The function 'findImport' is never used.
• The function 'patchImport' is never used.
• The function 'findFrameDesc' is never used.
• The function 'libIndex' is never used.
• The function 'isMarked' is never used.
• The function 'minAddress' is never used.
• The function 'maxAddress' is never used.
• The function 'contains' is never used.
• The function 'get' is never used.
• The function 'getPage' is never used.
• The function 'get_tag' is never used.
• The function 'getCounters' is never used.
• The function 'getCounter' is never used.
• The function 'describeCounters' is never used.
• The function 'units' is never used.
• The function 'check' is never used.
• The function 'start' is never used.
• The function 'supported' is never used.
• The function 'setSighandlerTid' is never used.
• The function 'bounded_lookup' is never used.
• The function 'stop' is never used.
• The function 'interval' is never used.
• The function 'enableEvents' is never used.
• The function 'updateCounter' is never used.
• The function 'registerThread' is never used.
• The function 'unregisterThread' is never used.
• The function 'hasChanged' is never used.
• The function 'updateNumSamplableThreads' is never used.
• The function 'updateNumSuccessfulSamples' is never used.
• The function 'updateNumFailedSamples' is never used.
• The function 'updateNumExitedThreads' is never used.
• The function 'updateNumPermissionDenied' is never used.
• The function 'endEpoch' is never used.
• The function 'clean' is never used.
• The function 'newEpoch' is never used.
• The function 'encode' is never used.
• The function 'decode' is never used.
• The function 'threadEntry' is never used.
• The function 'sampleIdleThreads' is never used.
• The function 'field' is never used.
• The function 'category' is never used.
• The function 'root' is never used.
• The function 'strings' is never used.
• The function 'jniExceptionCheck' is never used.
• The function 'is_readable_pointer' is never used.
• The function 'used' is never used.
• The function 'alloc' is never used.
• The function 'level' is never used.
• The function 'next' is never used.
• The function 'cputime' is never used.
• The function 'micros' is never used.
• The function 'processStartTime' is never used.
• The function 'sleep' is never used.
• The function 'ntoh64' is never used.
• The function 'threadId' is never used.
• The function 'schedPolicy' is never used.
• The function 'threadName' is never used.
• The function 'listThreads' is never used.
• The function 'isLinux' is never used.
• The function 'installSignalHandler' is never used.
• The function 'replaceSigsegvHandler' is never used.
• The function 'replaceSigbusHandler' is never used.
• The function 'sendSignalToThread' is never used.
• The function 'getCpuDescription' is never used.
• The function 'getProcessCpuTime' is never used.
• The function 'getTotalCpuTime' is never used.
• The function 'copyFile' is never used.
• The function 'truncateFile' is never used.
• The function 'fileSize' is never used.
• The function 'freePageCache' is never used.
• The function 'mallocArenaMax' is never used.
• The function 'walkKernel' is never used.
• The function 'resetBuffer' is never used.
• The function 'getEventName' is never used.
• The function 'compute' is never used.
• The function 'sample' is never used.
• The function 'is_probably_rust_legacy' is never used.
• The function 'demangle' is never used.
• The function 'skipLoad' is never used.
• The function 'skipLoadArg' is never used.
• The function 'tryLockShared' is never used.
• The function 'withinCurrentStack' is never used.
• The function 'restore' is never used.
• The function 'stackAt' is never used.
• The function 'clearParsingCaches' is never used.
• The function 'parseLibraries' is never used.
• The function 'isRootSymbol' is never used.
• The function 'forTid' is never used.
• The function 'inBuffer' is never used.
• The function 'tid' is never used.
• The function 'noteCPUSample' is never used.
• The function 'lookupWallclockCallTraceId' is never used.
• The function 'recordCallTraceId' is never used.
• The function 'enterCrashHandler' is never used.
• The function 'exitCrashHandler' is never used.
• The function 'resetCrashHandler' is never used.
• The function 'isDeepCrashHandler' is never used.
• The function 'unwindFailures' is never used.
• The function 'bitmapAddressFor' is never used.
• The function 'accept' is never used.
• The function 'remove' is never used.
• The function 'addressOfSize' is never used.
• The function 'getThreadId' is never used.
• The function 'clearAll' is never used.
• The function 'updateThreadName' is never used.
• The function 'reportCounters' is never used.
• The function 'convertJvmExecutionState' is never used.
• The function 'initialized' is never used.
• The function 'ticks' is never used.
• The function 'frequency' is never used.
• The function 'ticks_to_millis' is never used.
• The function 'record' is never used.
• The function 'forEach' is never used.
• The function 'countFailures' is never used.
• The function 'collectAndReset' is never used.

[github-actions]

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